epigenetics

Epigenetics Revolution: How Modern Biology Is Rewriting Our Understanding of Genetics, Disease and Inheritance

by Nessa Carey  · 31 Aug 2011  · 357pp  · 98,854 words

-term psychological damage as a result of childhood abuse. But these stories are linked at a very fundamental biological level. They are all examples of epigenetics. Epigenetics is the new discipline that is revolutionising biology. Whenever two genetically identical individuals are non-identical in some way we can measure, this is called

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repression. The other interpretation was that the CpG island became methylated, and it was this methylation that switched the gene off. In this model the epigenetic modification actually causes the change in gene expression. Although there is still the occasional argument about this between competing labs, the vast majority of scientists

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have overlaps in their presentation. Both lead to cleft palate and mental retardation. Both of these symptoms are classically considered as reflecting problems during development. Epigenetic pathways are important throughout life, but seem to be particularly significant during development. In addition to these histone writers and erasers there are over 100

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have different epigenomes. Interestingly, though, they also found that even the MZ twins differed in their DNA methylation patterns, suggesting identical twins begin to diverge epigenetically during development in the uterus. Combining the information from the two papers, and from additional studies, we can conclude that even genetically identical individuals are

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five generations of genetically identical individuals. Needless to say, this isn’t feasible for humans. This is why experimental animals have been so useful in epigenetics. They allow scientists to address really complex questions, whilst controlling the environment as much as possible. The data that are generated in these animal studies

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biology this way. Various comparative studies have shown that many systems have stayed broadly the same in different organisms over almost inconceivably long periods. The epigenetic machinery of yeast and humans, for example, share more similarities than differences and yet the common ancestor for the two species lies about one billion

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more variability in the body weights within the group. Further experiments published in the same paper assessed the effects of the decreased expression of these epigenetic proteins. Their decreased expression was linked to changes in expression levels of selected genes involved in metabolism6, and increased variability in that expression. In other

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proteins, and the precise effects that they have at specific chromosomal regions. A little bit more DNA methylation here, a little bit less there. The epigenetic machinery reinforces and then maintains particular patterns of modifications, thus creating the levels of gene expression. Consequently, these initial small fluctuations in histone and DNA

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a gradually increasing functional impairment. Clinically, we don’t recognise this until it passes some invisible threshold and the patient begins to show symptoms. The epigenetic variation that occurs in developmental programming is at heart a predominantly random process, normally referred to as ‘stochastic’. This stochastic process may account for a

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identical twins become phenotypically different, sometimes in the most dramatic of ways. Such a random process, caused by individually minor fluctuations in the expression of epigenetic genes during early development also provides a very good model for understanding how genetically identical Avy/a mice can end up with different coat colours

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pronounced. A major metabolic disturbance during early pregnancy, such as the dramatically decreased availability of food during the Dutch Hunger Winter, would significantly alter the epigenetic processes occurring in the foetal cells. The cells would change metabolically, in an attempt to keep the foetus growing as healthily as possible despite the

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keep everything a little clearer, we’ll use the phrase ‘transgenerational inheritance’ to describe the phenomenon of transmission of an acquired characteristic and only use ‘epigenetics’ to describe molecular events. Some of the strongest evidence for transgenerational inheritance in humans comes from the survivors of the Dutch Hunger Winter. Because the

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of malnutrition during early development. This seems like a good example of transgenerational (Lamarckian) inheritance, but has it has been caused by an epigenetic mechanism? Did an epigenetic change (altered DNA methylation and/or variations in histone modifications) that had occurred in Basje as a result of malnutrition during her first twelve

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cytoplasm could stimulate an unusual growth pattern in the foetus. This again would result in transgenerational inheritance but not through the direct transmission of an epigenetic modification. So we can see that there are various mechanisms that could explain the inheritance patterns seen through the maternal line in the Dutch Hunger

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we see transgenerational inheritance from father to child, it isn’t likely to be caused by intra-uterine or cytoplasmic effects. Under these circumstances, an epigenetic mechanism would be an attractive candidate for explaining transgenerational inheritance of an acquired characteristic. Greedy fellows in Sweden Some data suggesting that male transgenerational inheritance

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, for the reasons outlined earlier. Therefore, it seems reasonable to hypothesise that the transgenerational consequences of food availability in the grandparental generation were mediated via epigenetics. These data are particularly striking when you consider that the original nutritional effect happened when the boys were pre-pubescent and so had not even

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whom the agouti gene is expressed continuously, due to low levels of DNA methylation of the regulatory retrotransposon, never give birth to dark pups. The epigenetically – rather than genetically – determined characteristics of the mother influence her offspring. Because Emma Whitelaw was working on inbred mice, she was able to perform this

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model systems have been really useful in demonstrating that transgenerational inheritance of a non-genetic phenotype does actually occur, and that this takes place via epigenetic modifications. This is truly revolutionary. It confirms that for some very specific situations Lamarckian inheritance is taking place, and we have a handle on the

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least four generations, so this is another example of Lamarckian inheritance. Given the male transmission pattern, it is likely this is another example of an epigenetic inheritance mechanism. A follow-on publication from the same research group has identified regions of the genome where vinclozolin treatment leads to unusual DNA methylation

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the gene expression patterns of the zygote and the subsequent developmental stages. But this reprogramming also has another effect. Cells can accumulate inappropriate or abnormal epigenetic modifications at various genes. These disrupt normal gene expression and can even contribute to disease, as we shall see later in this book. The reprogramming

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, and mechanisms have evolved in our cells to control the activity of these types of retrotransposons. One of the major mechanisms that cells use is epigenetic. The retrotransposon DNA gets methylated by the cell, turning off retrotransposon RNA expression. This prevents the RNA disrupting expression of neighbouring genes. One particular class

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this. The reprogramming machinery has evolved to skip these rogue elements and leave the DNA methylation marks on them. This keeps the retrotransposons in an epigenetically repressed state. This has probably evolved as a mechanism to reduce the risk that potentially dangerous IAP retrotransposons will get accidentally re-activated. This is

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of nutrition on subsequent generations, and the transgenerational effects of environmental pollutants such as vinclozolin. Researchers are exploring the hypothesis that these environmental stimuli create epigenetic changes in the chromatin of the gametes. These alterations are probably in regions that are protected from reprogramming during early development after the egg and

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can become temporarily more pluripotent, lose their imprinting marks and transfer across into the germ cell lineage. Once the primordial germ cells have been diverted, epigenetic modifications again get attached to the genome. This is partly because pluripotent cells are potentially extremely dangerous as a multi-cellular organism develops. It might

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on their retrotransposon, which is why transmission of the phenotype only occurs through the maternal line30. This is a slightly more indirect method of transmitting epigenetic information. Instead of direct carry-over of DNA methylation, an intermediate surrogate (a repressive histone modification) is used instead. This is probably why the maternal

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controlled manner, in response to developmental cues or environmental signals. Women really are more complicated than men One interesting consequence of X inactivation is that (epigenetically) females are more complicated than males. Males only have one X chromosome in their cells, so they don’t carry out X inactivation. But females

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be very comforting to think that science generally proceeds in a logical and ordered fashion. Here’s one way we could imagine such progress in epigenetics … Epigenetic modifications control cell fate – it’s these processes by which liver cells, for example, stay as liver cells and don’t turn into other cell

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remove acetyl groups from histone proteins. Superficially, these seem like very different processes. Maybe it’s just coincidence that both 5-azacytidine and SAHA inhibit epigenetic enzymes? Epigeneticists believe that it is far from being a coincidence. DNA methyltransferase enzymes add a methyl group to the cytidine base. High concentrations of

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, two patients whose cancers appear very similar may be ill because of very different molecular processes. Their cancers may have rather different combinations of mutations, epigenetic modifications and other factors driving the growth and aggressiveness of the tumour. This means that different patients are likely to require different types and combinations

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prognosis for the patient. So, histone modifications and DNA methylation pathways interact. This may explain, at least in part, one of the mysteries of existing epigenetic therapies. Why are compounds like 5-azacytidine and SAHA only controllers of cancer cells, rather than complete destroyers? In our model, treatment with 5-azacytidine

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tumour suppressors without needing to worry about DNA methylation. An uneasy truce Is there something special about the tumour suppressor genes that get silenced using epigenetic modifications? There are two contrasting theories about this. The first is that there’s nothing special about these genes and the process is completely random

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mature, and for tissue regeneration following injury. The fates and identities of these tissue-specific stem cells are controlled by the precise patterns of epigenetic modifications. By using epigenetic modifications to control gene expression, the cells keep some flexibility. They have the potential to change into more specialised cells, for example. Perhaps

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teenager during the Dutch Hunger Winter. Imprinted genes get switched off at certain stages in development, and stay off throughout the rest of life. Indeed, epigenetic modifications are the only known mechanism for maintaining cells in a particular state for exceptionally long periods of time. The hypothesis that epigeneticists are testing

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is that early childhood trauma causes an alteration in gene expression in the brain, which is generated or maintained (or both) by epigenetic mechanisms. These epigenetically mediated abnormalities in gene expression predispose adults to increased risk of mental illnesses. In recent years, scientists have begun to generate data suggesting that

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repressive marks to that region of the genome. When the phosphorylated MeCP2 falls off the arginine vasopressin gene, it can no longer recruit these different epigenetic proteins. Because of this, the chromatin loses it repressive marks. Activating modifications get put on instead, such as high levels of histone acetylation. Ultimately, even

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argue that just because the changes are present, it doesn’t mean they’re necessarily having a functional effect. They worry that the alterations in epigenetic modifications are simply correlative, not causative. The scientists who have been investigating the behavioural responses in the different rodent systems counter this by arguing that

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that neurons contain higher levels of this chemical than any other cell type21. Remember, remember Despite these controversies, research is continuing into the importance of epigenetic modifications in brain function. One area that is attracting a lot of attention is the field of memory. Memory is an incredibly complex phenomenon. Both

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which over-expressed Hdac2 formed far fewer connections than normal, whereas the opposite was true for the neurons lacking Hdac2. This supports our model of epigenetically-driven changes in gene expression ultimately altering complex networks in the brain. SAHA improves memory in the mice that over-express Hdac2, presumably by dampening

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. Addressing this question is hugely challenging, and particularly difficult to assess in human populations. Guilt by more than association Having said that, there are some epigenetic modifications that are definitely involved in disease initiation or progression. The case for these is strongest in cancer, as we saw in Chapter 11. The

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shorter than usual. In 2009, Professor Shelley Berger, an incredibly dynamic scientist at the University of Pennsylvania whose group has been very influential in molecular epigenetics, published the results of a really elegant set of genetic and molecular experiments in yeast. Her research showed that the Sir2 protein influences ageing by

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inherited neurodegenerative disorder5. The greatest excitement, for both cancer and non-oncology conditions, is currently centred around the development of drugs that inhibit more focused epigenetic enzymes. These include enzymes that change just one modification at one specific amino acid position on histone proteins. Hundreds of millions of dollars are being

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molecules which are identical to the original. DNMT DNA methyltransferase. An enzyme that can add methyl groups to cytosine bases in DNA. Epigenome All the epigenetic modifications on the DNA genome and its associated histone proteins. ES Cells Embryonic stem cells. Pluripotent cells experimentally derived from the Inner Cell Mass. Exon

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Histone deacetylase. An enzyme that can remove acetyl groups from histone proteins. Histones Globular proteins that are closely associated with DNA, and which can be epigenetically modified. Imprinting Phenomenon in which expression of certain genes depends on whether they were inherited from the mother or the father. Inner Cell Mass (ICM

Epigenetics: How Environment Shapes Our Genes

by Richard C. Francis  · 14 May 2012

, it affected them equally. The same goes for whatever stress she experienced during pregnancy. More typical siblings, however, can experience quite different fetal environments. The epigenetic alterations that result will make one or the other more susceptible to obesity, diabetes, heart disease, and atherosclerosis, as well as depression, anxiety, and schizophrenia

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the cell, not the genes themselves. That is, gene regulation is a cellular activity. This is true for both garden-variety gene regulation and epigenetic gene regulation. Epigenetics is one form of cellular control over gene activity on this view. Genes and Traits Genes influence our traits through the proteins constructed from

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. Some individuals or ethnic groups are predisposed toward obesity because of their biological inheritance. In this chapter we will explore a different sort of predisposition: epigenetic. These epigenetic predispositions generally develop in the womb or in infancy. Thrifty Genes? Obesity per se is not a public health problem; it’s the bad

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come from diets formulated specifically for those either susceptible to or experiencing these ailments—from childhood on. Both the prophylactic and therapeutic potential of nutritional epigenetics extends to many other ailments as well, such as cancer, which I will discuss later in the book. What Predisposed Paradorn? We have explored

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A. thalinia is mediated by a number of resistance (R) genes. There is one particular cluster, located on chromosome 4, that is subject to epigenetic regulation. An epigenetic variant called bal causes one gene in this cluster to be chronically active. The gene behaves like the plant is under attack even when

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highly speculative. Diagram by the author. The transition from pluripotent embryonic stem cells to multipotent somatic stem cells, such as neural stem cells, is an epigenetic process during which an increasing number of genes are permanently inactivated (while other genes are newly activated). Differentiation continues past the multipotent somatic stem cell

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state—through further progressive epigenetic inactivation—until terminal differentiation into one of the two hundred plus cell types, such as cone cells or heart muscle cells. Cone cells and heart

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transcription, messenger RNA (mRNA) is constructed from the DNA template. During the second stage, called translation, a protoprotein is constructed from the RNA template. Most epigenetic gene regulation occurs at the first stage, usually by inhibiting transcription. MicroRNAs, in contrast, exert their influence during the second stage, translation. Though transcription is

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of its neighbor cells with which it (chemically) interacts. These intercellular interactions influence the environment within the cell, which in turn influences which genes are epigenetically activated or inactivated. Hence, if you move cells around, especially during early stages of embryonic development, their fates change, just as in Driesch’s sea

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differentiation, undermines preformationism as genetic program, most fundamentally, by challenging the view that genes are software that instructs the cellular machinery, viewed as hardware. Modern epigenetics makes sense only if genes are viewed as hardware, like other cellular constituents—as much instructed as instructor, as much directed as director, as much

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the disruption of normal interactions between cells. The disruption of cellular interactions alters the internal environment of the cells, which results in hypomethylation and other epigenetic changes. A carcinogen, on this view, is carcinogenic by virtue of disrupting normal cellular interactions within a tissue. Cancer development can potentially be detected much

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with great fidelity in the offspring. Much more indirect are the transgenerational effects observed in the maternal behavior and stress response of rats. Here, the epigenetic alterations that influence these behaviors are recreated through the social interactions that they both influence and are influenced by. This transgenerational effect is a positive

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) discusses dedifferentiation in kidney repair. 20. Stocum (2002). Interestingly, biochemicals obtained from amphibians can boost regeneration in mammals, an indication that the mammalian genome can epigenetically respond in an ordered way to environmental influences to which it is never normally exposed. 21. Fibroblast cells were used in these experiments (see Takahashi

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al. (1992). “Motherless mothers revisited: Rhesus maternal behavior and rearing history.” Primates 33: 251–255. Chang, H. S., M. D. Anway, et al. (2006). “Transgenerational epigenetic imprinting of the male germline by endocrine disruptor exposure during gonadal sex determination.” Endocrinology 147(12): 5524–5541. Chen, C., J. Visootsak, et al. (2007

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(17[.beta]-estradiol): Support for the demasculinization/feminization hypothesis.” Environ Health Perspect 114(Suppl 1): 134–141. Henderson, I. R., and S. E. Jacobsen (2007). “Epigenetic inheritance in plants.” Nature 447(7143): 418–424. Hendriks-Jansen, H. (1996). Catching ourselves in the act: Situated activity, integrative emergence, evolution, and human thought

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genome by nuclear transplantation.” Genes Dev 18(15): 1875–1885. Holliday, R. (1996). “Endless quest.” BioEssays 18(1): 3–5. Holliday, R. (2006). “Epigenetics: A historical overview.” Epigenetics 1(2): 76–80. Horvitz, H. R., and J. E. Sulston (1980). “Isolation and genetic characterization of cell-lineage mutants of the nematode Caenorhabditis

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(2010). “Reprogramming with defined factors: From induced pluripotency to induced transdifferentiation.” Mol Hum Reprod 16(11): 856–868. Mastroeni, D., A. McKee, et al. (2009). “Epigenetic differences in cortical neurons from a pair of monozygotic twins discordant for Alzheimer’s disease.” PLoS One 4(8): e6617. Mattick, J. (2003). “Challenging the

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(2005). “Developmental origins of the metabolic syndrome: Prediction, plasticity, and programming.” Physiol Rev 85(2): 571–633. Meaney, M. J., M. Szyf, et al. (2007). “Epigenetic mechanisms of perinatal programming of hypothalamic-pituitary-adrenal function and health.” Trends Mol Med 13(7): 269–277. Meder, A. (1993). “The effect of familiarity

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N Y Acad Sci 1179: 167–178. Rheinberger, H.-J. (2008). “Gene.” Stanford encyclopedia of philosophy. Stanford, CA: Stanford University. Richards, E. J. (2006). “Inherited epigenetic variation—revisiting soft inheritance.” Nat Rev Genet 7(5): 395–401. Riggs, A. D. (2002). “X chromosome inactivation, differentiation, and DNA methylation revisited, with a

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257. Zeisel, S. H. (2009). “Importance of methyl donors during reproduction.” Am J Clin Nutr 89(2): 673S–677S. Zilberman, D., and S. Henikoff (2005). “Epigenetic inheritance in Arabidopsis: Selective silence.” Curr Opin Genet Dev 15(5): 557–562. Index abuse, childhood acetylation activation, of genes, see gene expression adenine adipose

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: Dutch famine and gene expression correlated with life expectancy and neonatal health and obesity and bisphenol A Bissell, Mary blastocysts blastula as pluripotent blood cells, epigenetic changes in blood stem cells brain androgen receptors in gene expression in glucocorticoid receptors in hippocampus in hypothalamus in stress biasing and breast cancer gene

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and aneuploid theory of cellular dedifferentiation and cellular stability of dedifferentiation theory of demethylation in in dogs embryonic stem cells and endocrine disruptors and epigenetic alterations in epigenetic inheritance and gene regulation and immune system and metastasis of microenvironmental view of mutation and normalization and somatic mutation theory (SMT) of spontaneous remission

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treatment of see also specific cancers cancers, embryonic canine transmissible venereal tumor (CTVT) canonical gene Canseco, José carbohydrates carcinogens cardiovascular disease: in Dutch famine cohort epigenetic inheritance and genomic imprinting and metabolic syndrome and stress biasing and Caroms (game) Castle, William Catholic Church cavies Cc (cat) cell division cells, cellular environment

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Famine Birth Cohort Study birth weight in cardiovascular disease in diabetes in obesity in psychiatric disorders in timing of exposure as factor in egg cells, epigenetic attachments removed in production of egg fertilization embryonic cancers embryonic skin cells embryonic stem cells cancer and cellular interactions and controversy surrounding as pluripotent endocrine

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disruptor mimicking of evolutionary biology executive function: as residing in cells as residing in genes as residing in genome exons extracellular matrix eye color famine: epigenetic inheritance and see also Dutch famine; Dutch Famine Birth Cohort Study fast-food chains fat cells (adipose tissue): gene expression in melanin production in Faulkner

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gene regulation gene regulation cancer and as cell type-specific executive function in, see executive function garden-variety (short-term) social interactions and gene regulation, epigenetic in development Driesch and as long-term methylation and, see methylation/demethylation microRNA and in plants as reversible stress biasing and war and Xist RNA

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-origin effect in paternal origin and transgenerational effects of imprinting control regions (ICRs) Indian Ocean tsunami (2004) induced pluripotent stem cells (iPSCs) inheritance: epigenetic processes in see also epigenetic inheritance; imprinting, genomic; social inheritance injury repair, cellular dedifferentiation in intracisternal A particle (IAP) introns Inuits Janus metaphor Juiced (Canseco) Just, Ernest Everett

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in, see agouti locus Axin gene in gene methylation in imprinting disruption in stress biasing in microenvironment, of cancer cells microRNA monozygotic twins: discordances in epigenetic alterations in Kallmann syndrome in stress responses in Morgan, Thomas Hunt mortality, male vs. female risk of mothering: affectionless control in in gorillas hormonal changes

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factor A) NGF gene normalization, of cancer cells nutrition, maternal, fetal development and obesity: agouti alleles and birth weight and childhood in Dutch famine cohort epigenetic explanations of as family trait fetal environment and gene mutation and genetic explanations of genomic imprinting and GR expression and Western lifestyle and obsessive-compulsive

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disorder, maternal style and Ohno, Susumu olfaction, epigenetic inheritance and olfaction, Kallmann syndrome and, ix–x olfactory placode oligopotent cells oncogenes see also cancer “one gene – one protein” rule opsin genes organicism organ

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parent-of-origin effect see also imprinting, genomic paternal care pathogen defense, growth vs. Petchburi Province, Thailand phenotypes thrifty pheromones pituitary placenta, imprinting in plants, epigenetic inheritance in pleiotropy pluripotent cells polychlorinated biphenyls (PCBs) population genetics postnatal environment, mismatch between fetal environment and posttranslational processing posttraumatic stress disorder (PTSD) Holocaust and

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species processed foods proopiomelanocortin (POMC) gene prostate cancer protein, dietary protein synthesis protoprotein psychiatric disorders, Dutch famine and Rainbow (cat) randomness: in biochemical processes in epigenetic inheritance Wright’s emphasis on in X inactivation rats, see mice and rats reciprocal causation (feedback) regeneration: in amphibians in mammals resistance (R) genes retrotransposon

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rhesus monkeys rheumatoid arthritis RNA: editing of in epigenetic inheritance messenger (mRNA) micro- pre–messenger RNA small interfering (siRNAs) Xist RNA interference rodents see also specific species Rosenberg, K. M. Roux, Wilhelm sainthood, criteria

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somatic mutation theory (SMT) of cancer somatic stem cells cancer and, see somatic mutation theory (SMT) of cancer spatial cognition sperm cells: in egg fertilization epigenetic attachments removed in production of sperm development spina bifida stamping, genetic stature, genomic imprinting and stem cells blood induced pluripotent neural see also embryonic stem

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cells; somatic stem cells stress, maternal stress axis hyperresponsiveness in, see stress biasing stress biasing epigenetic gene regulation and maternal style and in mice and rat studies in primates stress response to chronic stressors fight or flight hyperactivity of, see stress

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thymine tigons tissue-based theory of cancer Toguchi, Audrey Toronto zoo totipotent cells traits: genes as linked to sex-linked transcription transcription factors transdifferentiation transgenerational epigenetic processes translation translocation tumor suppressor genes Turner neurocognitive phenotype Turner syndrome unipotent cells viable yellow (Avy) agouti allele Vietnam Veterans Memorial Vietnam War vinclozolin Vindicated

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(Canseco) violence, steroid use and vision, color, see color vision vitalism vitamin B12 Waddington, Conrad war, epigenetic changes induced by Washington, George Watson, James Wayne, John weed killers Weismann, August Western lifestyle: obesity and stress in Wilhelmina Gasthuis Hospital Wilms’ tumor Wolf

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World War II: battle fatigue in Dutch famine in, see Dutch famine Wright, Sewall X chromosome opsins on see also sex-linked traits X inactivation epigenetic processes in histones in in marsupials methylation in randomness in X-inactivation center (Xic) X-inactive-specific transcript (Xist) XO females “X-women,” Y

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Courier Westford Book design by Lovedog Studio Production manager: Anna Oler Library of Congress has cataloged the hardcover edition as follows: Francis, Richard C., 1953– Epigenetics : the ultimate mystery of inheritance / Richard C. Francis. — 1st ed. p. cm. Includes bibliographical references and index. ISBN 978-0-393-07005-7 (hardcover) 1

Deep Nutrition: Why Your Genes Need Traditional Food

by Catherine Shanahan M. D.  · 2 Jan 2017  · 659pp  · 190,874 words

sculpted, in part, by the foods our parents and grandparents ate (or didn’t eat) generations ago. The body of evidence compiled by thousands of epigenetic researchers working all over the world suggests that the majority of people’s medical problems do not come from inherited mutations, as previously thought, but

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. Their songs and prayers reflected the belief that in consuming food, each of us comes in contact with the great, interconnected web of life. Epigenetics proves that intuitive idea to be essentially true. Our genes make their day-to-day decisions based on chemical information they receive from the food

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engineer and enrolled in every course I could to study genetics. I went to graduate school at Cornell, where I learned about gene regulation and epigenetics from Nobel Prize–winning researchers, then straight to Robert Wood Johnson Medical School in New Jersey, in hopes of putting my knowledge of the fundamentals

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traditional cuisine, I changed everything about the way I eat. For me, eating in closer accordance with historical human nutrition corrected some of my damaged epigenetic programming. I got fewer colds, less heartburn, improved my moods, lost my belly fat, had fewer headaches, and increased my mental energy. And eventually

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leaves curl and its color fade knows that proper care and feeding can have dramatic, restorative effects. The same applies to our genes—and our epigenetic programming. Not only will you personally benefit from this during your lifetime with improved health, normalization of fat distribution, remission of chronic disease, and

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why this built-in ability makes me certain that many of us have untapped genetic potential waiting to be released. CHAPTER 2 The Intelligent Gene Epigenetics and the Language of DNA “Good genes” make us healthy, strong, and beautiful and represent a kind of family fortune we call genetic wealth.

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the last two decades, scientists have discovered that this material has some amazing abilities. This line of discovery emerges from a branch of genetics called epigenetics. Epigenetic researchers investigate how genes get turned on or off. This is how the body modulates genes in response to the environment, and it is how

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two twins with identical DNA can develop different traits. Epigenetic researchers exploring this expansive genetic territory are finding a hidden world of ornate complexity. Unlike genes, which function as a relatively static repository of encoded

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be that the same mechanisms facilitating cell maturation also function over generations, enabling species to evolve? According to Arturas Petronis, head of the Krembil Family Epigenetics Laboratory at the Centre for Addiction and Mental Health in Toronto, “We really need some radical revision of key principles of the traditional genetic research

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our misapprehension of evolution in perspective: mutation- and selection-driven evolutionary change is just the tip of the iceberg. “The bottom of the iceberg is epigenetics.”22 The more we study this mysterious 98 percent, the more we find it seems to function as a massively complicated regulatory system that serves

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in analog terms rather than digital, enabling our DNA to store and compute far more information than previously imagined. One of the positive functions of epigenetics is to come up with novel and creative solutions to less-t genes to make intelligent compromises. Take the development of the eye, for

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from two sets of identical twins, one set aged three and the other aged fifty. Using fluorescent green and red molecules that bind, respectively, to epigenetically modified and unmodified segments of DNA, they examined the two sets of genes. The children’s genes looked very similar, indicating that, as one

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far, the processes identified include bookmarking, imprinting, gene silencing, X chromosome inactivation, position effect, reprogramming, transvection, maternal effects, histone modification, and paramutation. Many of these epigenetic regulatory processes involve tagging sections of DNA with markers that govern how often a gene uncoils and unzips. Once exposed, a gene is receptive to

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what the various nutrients it contacts are good for. Through mechanisms not fully understood, DNA has been programmed at some point in the past by epigenetic markers that can turn certain DNA portions on or off in response to certain nutrients. The entire programming system is designed for change; these

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levels of certain nutrients could promote these reproduction errors. Folic acid, B12, and a number of essential amino acids are used for a type of epigenetic bookmarking called methylation; a lack of any one of these vital nutrients would result in undermethylation and critical bookmarks may be omitted. Their research showed

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in utero nutrition may be a major contributor to the current cycle of obesity.”33 The article shows that children born to overweight mothers are epigenetically programmed to build adipose tissue in unhealthy amounts. This suggests that millions of malnourished moms are, unbeknownst to them, programming their children for a

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vitamin C. After generations of nonuse (due to abundance of vitamin C in our food), the gene would have grown very “sleepy.” Eventually, when epigenetic “test marketing” had demonstrated that we could live without being able to make our own vitamin C, a mutation within the gene permanently deactivated it

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. How, exactly, might this test marketing work? Certain markers increase the error rate during reproduction, and thus a temporary epigenetic change can set up the gene to be permanently altered by a base pair mutation.41 Genes are like tiny protein-producing machines that create

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different products. If a factory worker (think epigenetic tagging) shuts off one machine and everything in the cell continues to run smoothly over the ensuing generations, then that particular machine (gene) can

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be refashioned to produce something else, or turned off altogether. The more we learn about epigenetics, the more it seems that genetic change—both the development of disease and even evolution itself—is as tightly controlled and subject to feedback as

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which programming codes work best for what, or how the many environmental inputs—minerals, vitamins, toxins, and so on—might be translated into a new epigenetic strategy, but some intriguing research offers support to the idea that DNA can indeed take notes. In 1994, mathematicians observed that junk DNA contained patterns

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fed vitamin A, the next litters developed normal eyeballs, suggesting that eyeball growth was not switched off due to (permanent) mutation, but to a temporary epigenetic modification. Vitamin A is derived from retinoids, which come from plants, which in turn depend on sunlight. So in responding to the absence of vitamin

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that makes them beautiful. BEAUTY EMERGES FROM MATH Every line of Marquardt’s Mask is geometrically plotted according to the dynamic symmetry of phi. When epigenetic conditions provide for optimal growth, facial features “crystalize” in a pattern that conforms to the mask. This is the female mask. According to Marquardt,

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of successful survival in the wild was squandered as poverty or plague denied genes the nutrients they needed. During each period of nutritional deprivation valuable epigenetic programming was lost. As time has passed, we have required more and more safety nets and invented correctives like glasses, braces, and thousands of

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proper timing of gene expression requires specific nutrients in specific concentrations, if a second sibling gestates in a lessor nutritional environment than the first, their epigenetic expression will be suboptimal, and growth and development will be impaired. We know, for example, that low birth weight, often due to mom’s

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pressure (both associated with poor nutrition), puts children at risk for low bone mass and relative obesity for the rest of their lives.131 Abnormal epigenetic responses due to nutrient deficiency may explain why children of subsequent births are at higher risk for disease, from cancer132 to diabetes133 to low IQ

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of prescriptions, and expand our definition of normal childhood health to encompass all manner of medical intervention. This latest generation of children has accumulated the epigenetic damage of at least the three previous generations due to lack of adequate nutrition along with the overconsumption of sugar and new artificial fats found

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, brain, and other organ growth. Many physicians have noted an apparent increase in young couples complaining of problems with fertility which, given the implications of epigenetic science, should come as no surprise. Children born today, I’m afraid, may be so genomically compromised that, for many, reproduction will not be

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operating under moderate duress for a spell is effectively rehabilitated. SKELETAL RESPONSES TO DIET CHANGE Short stature may be a kind of biologic “choice,” an epigenetic adaptation to inadequate bone-building material in a previous generation’s diet. Rather than build weak, breakable bones, the genome makes bone of the same

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women with higher levels.306 Even when carried to term, babies of mothers with low cholesterol are often born smaller, with abnormally small brains. Remember, epigenetic alterations can accumulate over generations. So when these small-brained babies have babies of their own while on low-cholesterol diets themselves, it’s anybody

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lose our personalities, and our connections to the world. 6. Gene replication. Vegetable oils impair brain development through direct mutagenic effects on DNA and altered epigenetic expression. If you’ve read Grain Brain, Cereal Killer, Sugar Crush, Sweet Poison, The Sugar Blues, Fat Chance, Sugar Nation, The Starch Solution, or

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Chapter 2, I touched upon the idea that an optimal nutritional environment is required to ensure the accurate transcription of genetic material and communication of epigenetic bookmarking, and how a pro-oxidative, pro-inflammatory diet can sabotage this delicate operation in ways that can lead to mutation and alter normal growth

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gene expression.” In other words, the study rats had been programmed to consume substances that stimulate their opiate receptors.448 Sugar acts as a powerful epigenetic instructor, telling your child’s genes to construct a brain with a built-in hankering for drugs. As Michael Pollan points out in The

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s a common misperception that milk drinking is a relatively new practice, one limited to Europeans. The reality is that our cultural—and now, our epigenetic—dependence on milk most likely originated somewhere in Africa. It is highly likely that milk consumption gave those who practiced animal husbandry such an advantage

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irritating lactose sugars are gone. A child living in a warmer climate would, after weaning, have such infrequent need for the lactase enzyme that the epigenetic librarian would simply switch the gene off. In cooler European climates, fresh milk stays fresh for hours or days, and was presumably consumed that

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way often enough to keep the lactase enzyme epigenetically activated throughout a person’s life. If you have true lactose intolerance, as opposed to a protein allergy, you should be able to tolerate plain

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and a half months in utero is a minor miracle requiring a wholesome, rich environment. No physiologic event is as dramatic as the transcription of epigenetic data from gametes to zygote. And therefore none is as dependent on good nutrients, or more vulnerable to the interference of toxins. Nutrition’s

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and behavior—from assigning cellular identity to cell growth and maturation—is a process that continues throughout our entire lives. What scientists have learned about epigenetics and the protean nature of cells tells us that, just like a baby developing inside the womb, our bodies continue to be a work

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, at http://www.Alzheimers.net/resources/Alzheimers-statistics/ Chapter 1 8. Dr. Michael Dexter, Wellcome Trust. 9. Transposable elements: targets for early nutritional effects on epigenetic gene regulation, Waterland RA, Molecular and Cellular Biology, August 2003, vol. 23, no. 15, pp. 5293–5300. 10. Nutrition and Physical Degeneration, Price W,

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pregnancy and childhood bone mass at age nine years: a longitudinal study, Javaid MK, Obstetrical and Gynecological Survey, 61(5):305-307, May 2006. 15. Epigenetic epidemiology of the developmental origins hypothesis, Waterland RA, Annual Review of Nutrition, vol. 27, August 2007, pp. 363-388. 16. See Chapter 11. 17.

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. 20. Pluripotency of mesenchymal stem cells derived from adult marrow, Jiang Y, Nature, July 2002, 4;418(6893):41-9, epub Jun 20, 2002. 21. Epigenetics, the science of change, Environ Health Perspect, March 2006, 114(3): A160–A167. 22. Environmental Health Perspectives, vol. 114, no. 3, March 2006. 23.

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Pflueger C, Cairns BR, Carrell DT, 2014, PLoS Genet, 10(7). 31. Effects of an increased paternal age on sperm quality, reproductive outcome and associated epigenetic risk to offspring, Rakesh Sharma et al, Reproductive Biology and Endocrinology, 2015, 13:35. 32. Age-associated sperm DNA methylation alterations: possible implications in offspring

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p. 224. 521. Dietary fat requirements in health and development, Thomas H Applewhite, American Oil Chemists Society, 1988, p. 30. Chapter 11 522. Jaenisch, R, Epigenetic regulation of gene expression: how the genome integrates intrinsic and environmental signals, Nature Genetics, 33, 245-254 (2003). 523. Orexins in the brain-gut axis

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dog food, compared to cereal dynamic symmetry E E. coli as pathogen eczema eggs Egyptians, nutrition among ancient elastin Enig, Mary endorphins endothelial function enzymes epigenetics See also genes; genetics erectile dysfunction (ED) Essylstein, Rip estrogen Etcoff, Nancy eugenics evolution exercise aerobic anaerobic benefits of successful habits for and sugar eyes

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and autism beauty and damage to and diet and exercise and heart disease importance of, to good health and pregnancy programming of See also DNA; epigenetics genetic momentum genetic potential genetic wealth economics of loss of maximizing and restoring gastro-esophageal reflux disease (GERD) germination Ghandi, Mahatma ginseng glucose gluten,

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Notice Dedication Author’s Note Introduction Part One: The Wisdom of Tradition 1 Reclaiming Your Health The Origins of Deep Nutrition 2 The Intelligent Gene Epigenetics and the Language of DNA 3 The Greatest Gift The Creation and Preservation of Genetic Wealth 4 Dynamic Symmetry The Beauty-Health Connection 5 Letting

The Human Age: The World Shaped by Us

by Diane Ackerman  · 9 Sep 2014  · 380pp  · 104,841 words

lives than their peers. It’s as if they had inherited a genetic scar. How and why this evolutionary sidestep happens is the focus of epigenetics, a new science that puts all the old-fashioned college debates about nature or nurture on the Anthropocene scrap heap of outmoded ideas. It also

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until now, inheritance was a tale told by DNA; it lay exclusively in the genes. In the watch-how-you-step, deep-nurture world of epigenetics, proteins tag DNA by coiling around it, pythonlike, squeezing some genes tighter and loosening others, in the process switching them on or off, or leaving

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as chimpanzees. Gifted with the same libretto of genes, life forms intone them differently, and our own cells morph into skin, bone, lips, liver, blood. Epigenetics is providing clues to how this tonal magic is performed. Pembrey’s fascinating hypothesis is that the Industrial Age ushered in a flood of rapid

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, it couldn’t adapt that fast. The speed of change was unprecedented, and our genes don’t evolve in just a few generations. But certain “epigenetic tags” clinging to those genes could. So the pesticides or hydrocarbons your great-grandmother was exposed to when she was pregnant may heighten the risk

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risk on to your grandchildren. Ovarian cancer has been increasing to affect more than 10 percent of women over the past few decades, and environmental epigenetics offers a plausible reason why. We only exist in relation to others and the world. This dialogue, a three-ring circus among the genes, a

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perpetual biological tango performed by multitudes, deserves a better name than the unwieldy crunch of “epigenetics,” but the word is springing from many more lips as doctors search for clues in both a patient’s environmental exposure history and that of

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developing it are only 50 percent, not 100 percent as one might assume since they have identical genes. Twins have become an important part of epigenetic studies. So have children of Holocaust survivors, Romanian orphans who weren’t held and comforted enough, and children with stress-rattled or neglectful caregivers. From

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psychiatric epigenetics we’re learning how important a mother’s mood is to the fate of her fetus. The chemicals that swaddle and seep through a fetus

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inherited telomeres long as a summer night. None of this happens by unzipping and altering the codebook of DNA, yet it’s inherited by offspring. Epigenetics is the second pair of pants in the genetic suit, another weave of heredity, and although revising someone’s genome is hard, it’s relatively

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the McGill study, researchers were able to undo the chilly behavior of the second generation of mother rats by using epigenetic drugs to turn genes on or off. The great promise of epigenetics is the possibility of curing cancer, bipolar disorder, schizophrenia, Alzheimer’s, diabetes, and autism by simply flipping the switches

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disorders) capable of silencing bum genes and spurring on healing ones. Many illnesses, such as ALS and autism, appear to be epigenetic, which puts them within reach. Three different types of epigenetic drug therapy are being actively investigated for schizophrenia, bipolar disorder, and other major psychoses. The FDA has already approved several

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epigenetic drugs, and in 2008 the National Institutes of Health (NIH) declared epigenetics “central” to biology and committed $190 million to understanding “how and

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when epigenetic processes control genes.” The Human Genome Project, completed in 2003, rightly celebrated as

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Project is under way. The good news is that these are problems with possible, if not simple, solutions: ban more environmental toxins known to trigger epigenetic havoc; work harder to ease famine, reduce poverty, and repair the ravages of war; and help people understand the long-term impact of their actions

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rewire your genes in positive ways, and just as startlingly, the nurturing you do for friends, sweethearts, and other people’s children can have lasting epigenetic effects. Once that idea registers, it changes the relationship between generations, which suddenly have everything in common, and the tapestry of the human condition grows

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. There’s also a moral, social, and political lesson: while humanitarian programs may seem nonessential, an extravagance of resources and spirit we can’t afford, epigenetics teaches us that, on the contrary, poor education, violence, hunger, and poverty leave scars on one generation after another in a way that ultimately affects

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the future health and well-being of whole societies. What happens to war-torn soldiers and civilians during and after battle leaves epigenetic traces to wound future generations, adding to a country’s problems, even in peacetime. The same is true of natural disasters, and we’ve seen

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plenty of both of late. Who knows what epigenetic aftermath will result? Genetic engineering may seem like a diabolical threat to us as a species, and we do need scrupulous oversight and control of

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such life forms. But the political and environmental choices we make—those with epigenetic repercussions—are equally powerful engines of change, ones we can often identify and fine-tune. MEET MY MAKER, THE MAD MOLECULE Returning to our mystery

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be deposed, and Toxoplasma responds well to antibiotics. In any case, would it have a greater influence than family dramas, pharmaceuticals, TV, college, climate, love, epigenetics, and other factors in human behavior? It’s probably one spice among many. After all, a slew of elements and events influence us from day

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acronym made up to fit it) standing for Systems of Neuromorphic Adaptive Plastic Scalable Electronics. DNA’s Secret Doormen 273Zdenko Herceg and Toshikazu Ushijima, eds., Epigenetics and Cancer, Part B (San Diego, CA: Academic Press, 2010). 273“China starts televising”: James Nye, Mail Online, January 16, 2014. Meet My Maker, the

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Robots Will Change Us. New York: Pantheon, 2002. Bunce, Michael. The Countryside Ideal: Anglo-American Images of Landscape. New York: Routledge, 1994. Carey, Nessa. The Epigenetics Revolution: How Modern Biology is Rewriting Our Understanding of Genetics, Disease and Inheritance. London: Icon Books, 2011. Carr, Nicholas. The Shallows: What the Internet is

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York: Grove, 2006. Forbes, Peter. The Gecko’s Foot: Bio-inspiration—Engineering New Materials from Nature. New York: W. W. Norton, 2006. Francis, Richard C. Epigenetics: The Ultimate Mystery of Inheritance. New York: W. W. Norton, 2011. Fraser, Caroline. Rewilding the World: Dispatches from the Conservation Revolution. New York: Picador, 2010

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: Ecco, 2009. Hutchins, Ross E. Nature Invented It First. New York: Dodd, Mead, 1980. Jablonka, Eva, and Marion J. Lamb. Evolution in Four Dimensions: Genetic, Epigenetic, Behavioral, and Symbolic Variation in the History of Life. Cambridge, MA: MIT Press, 2006. Jackson, John Brinckerhoff. Discovering the Vernacular Landscape. New Haven, CT: Yale

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, 222–23 empathy, 190, 219, 228 Energy Department, U.S., 64 England, 132 English ivy, 132 EnsnAired, 98 Environmental Protection Agency, U.S., 86–87 epigenetics, 279–86 Estonia, 77 eucalyptus, 132 Eureqa machine, 219–20, 221 European badgers, 124 Eve (robot), 221 Everglades, 129, 130, 133, 315 evolution, 208, 211

Junk DNA: A Journey Through the Dark Matter of the Genome

by Nessa Carey  · 5 Mar 2015  · 357pp  · 98,853 words

transcript. c Bases rather than base pairs, because RNA is single-stranded. d The gene is called MeCP2 and its role is to bind to epigenetically modified (methylated) DNA, where it interacts with other proteins and represses gene expression at the sites where it binds. 8. Playing the Long Game

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same genome. Genetically identical mice, reared under completely standard laboratory conditions, aren’t all the same weight. You and I, dear readers, are masterpieces of epigenetics. The 50–70 trillion cells in a human body pretty much all contain exactly the same genetic code.a Whether they are salt-secreting cells

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for haemoglobin, the pigment that carries oxygen in our red blood cells. These are all examples of situations we have referred to for decades as epigenetic phenomena. Yes, exactly the same word as for the modifications, and it makes sense. These are all situations where something else is happening in

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addition to, or as well as, the genetic code. The discovery of DNA methylation finally gave us a mechanism to understand how epigenetic phenomena happen. In a neuron, the genes responsible for producing haemoglobin become heavily methylated and are switched off. They stay switched off through life. In

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blood cells, however, these genes are not methylated and haemoglobin is created. But the genes that code for neurotransmitter receptors are switched off using this epigenetic mechanism in these cells. DNA methylation is pretty stable. It’s surprisingly difficult to remove this modification. This is a good thing if your cells

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all the complex cellular pathways run in an integrated fashion. But if one part of the complex interaction between long non-coding RNAs and the epigenetic machinery goes out of kilter, problems may develop. Unfortunately, this seems to be exactly what is happening in some cancers. The major repressor is

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cancers, which we encountered in the same chapter (see pages 106, 108). It binds to the complex containing the major repressor, and simultaneously to another epigenetic enzyme that can deposit an additional repressing modification.9 One of the features implicit in the above explanation is that the long non-coding RNA

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DNA or the histone protein. They include the major repressor of histones, and also the enzymes that add methyl groups to DNA.13 The epigenetic modifications they produce strengthen the shutdown of genes and ultimately lead to hyper-compaction of the inactive X chromosome, and the formation of the Barr

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result is that it is impossible for the cell to express the Fragile X protein, and the consequence of this interaction between junk DNA and epigenetics is a lifetime of learning disability and social disadvantage. Footnotes a The exceptions are the cells of the immune system that fight off specific infections

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called lysine at position 27 on histone H3. The technical nomenclature for this modification is H3K27me3 and it is the best-characterised repressive mark in epigenetics outside of DNA methylation. c This complex is known as Polycomb Response Complex 2 or PRC2. The activity of PRC2 is closely coordinated with that

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regions of the genome, normal development is critically dependent on inheriting one copy of a specific gene (or genes) maternally and the other paternally. The epigenetic modifications don’t just act as pieces of blue or pink genetic decoration indicating who gave you which copy of a gene. The modifications control

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. Imprinting has evolved to balance out the competing demands of the male and female contributions to the genome. At a small number of genes, epigenetic modifications on the DNA inherited from the father set up patterns of gene expression that promote embryo growth. At the same genes, a different pattern

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of epigenetic modifications on the DNA inherited from the mother has the opposite effect. During development, the relevant paternal genes often drive expression of a large, efficient

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this is because the long non-coding RNA attracts these enzymes to the imprinted cluster, thereby targeting the histone modifications to the protein-coding genes. Epigenetic modifications are also present at the ICE itself. As we would expect, if the ICE DNA is methylated, the histone modifications are ones which are

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associated with switching genes off. If the ICE is unmethylated, the histone modifications are those which are associated with switching genes on. The pattern of epigenetic modifications on the ICE is completely consistent across the DNA and histone proteins.9 In the imprinting process, the critical determinant is whether or not

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-Willi syndrome. This is also the case if the copy inherited from the father has lost the imprinted region that carries the paternal signature of epigenetic modifications. Essentially, a lack of paternal-specific information leads to Prader-Willi syndrome. Angelman syndrome is caused by a defect in exactly the same

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problems including defects in the abdominal wall.27,28 For most of these disorders, there are also rare examples of the condition developing because of epigenetic mistakes. There are small numbers of patients who have inherited the correct DNA from the correct parent. The DNA is not mutated and yet

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expression. The strength of the promoter is dependent on multiple factors in mammalian cells, including the DNA sequence but also the transcription factors available, the epigenetic modifications and probably a host of other variables that we haven’t yet identified. Driving a graduated response Any given promoter in any given cell

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the Veyron, or rather less than half of that for the Sandero. In cells, this flexibility is dependent on a number of interacting processes including epigenetics. But it is also influenced by another region of junk DNA. This region is known as the enhancer. Compared with promoters, enhancers are very

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enhancers – cross-talk in action One way in which genetic regions can maintain a memory even after a stimulus has gone away is via epigenetics. Epigenetic modifications can make a region easier to switch on again, by keeping the region in a fairly de-repressed state. In human terms, it’s

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was removed, keeping them in a state of readiness. We are generally starting to make a bit more progress at identifying enhancers by looking at epigenetic modifications, which are independent of the underlying DNA sequences. The modifications can be used as functional markers to show how a specific cell type uses

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few years of slaughter, these regions are anything but devoid of activity. The No Man’s Land of the human genome binds proteins, garners epigenetic modifications and regulates the interactions of different genetic elements in a highly active way. This is important to our cells, because most of our genes

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to the particular developmental stage. We don’t want teeth genes expressed in our eyes or heart genes expressed in our bladders. We know that epigenetic modifications influence gene expression. If we take the brain as an example, there are some genes that are never expressed in neuronal cells. For

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these repressive modifications from creeping along from the keratin gene and starting to switch off other genes as well? This is particularly a problem because epigenetic modifications are often self-sustaining. Let’s take the case of modifications that are involved in repressing gene expression. These modifications attract other proteins that

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gene to the next. In the lower panel, the lack of histones in the insulator regions between two genes prevents the spread of the repressive epigenetic modifications, and stops the right-hand gene from being abnormally silenced. But because different cells need to insulate different regions (we do, after all,

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of the proteins can alter the coiling of DNA, which can be important for controlling gene expression.3 Another is a protein that deposits specific epigenetic modifications.4 In some regions the types of genomic interlopers we met in Chapter 4 serve as insulators, preventing the spread of activating or repressive

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size from thousands of bases to molecules a hundred times smaller. ENCODE also defined genome regions as being functional if they carried particular combinations of epigenetic modifications that are usually associated with functional regions. Other methodologies involved analysing regions that looped together in the way that we encountered in the previous

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these claims are based on indirect measures of function. This was especially true for the studies where function was inferred either from the presence of epigenetic modifications or from other physical characteristics of the DNA and its associated proteins. Potential versus actual The sceptics argue that at best these data indicate

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a difference to the level of light in the room. The same situation may take place in our genomes. There may be regions that carry epigenetic modifications, or have specific physical characteristics. But this isn’t enough to demonstrate that they are functional. These characteristics may simply have developed as a

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of the DNA change in some people. This could include other enhancers working more strongly, and boosting expression of the morphogen. There may also be epigenetic compensation in some people, which nudges the expression of key genes in a certain direction. It may be a combination of both these factors,

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narrow down their search, the investigators studied what happens when stem cells differentiate into pancreas cells in culture. They looked for regulatory regions which carried epigenetic modifications normally associated with enhancer function, and which bound transcription factor proteins known to be important in the development of pancreas cells. This narrowed the

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the immature brain cells are dividing during development. This generates a cancerous cell programme in the infant.25 This cross-talk between smallRNAs and the epigenetic machinery of the cell may be significant in other situations where cells become predisposed to cancer. This mechanism can amplify the impact of disrupted smallRNA

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expression, by altering epigenetic modifications, which can be passed on to daughter cells. This can start a hard-wiring in of potentially dangerous alterations in gene expression. Not all

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the steps have been unravelled in how smallRNAs interact with epigenetic processes, but hints are emerging. For example, a particular class of smallRNAs which trigger increased aggressiveness in breast cancer targets the messenger RNAs for

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on smallRNAs. RaNA Therapeutics, which is believed to be developing RNA-based drugs that will prevent the interaction of long non-coding RNAs with the epigenetic machinery, raised over $20 million in 2012.17 Dicerna, which is developing smallRNAs against some rare diseases and oncology indications, raised $90 million in

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would explain why investors are pouring money into new biotechs in this area. One day science will probably be able to interpret all the possible epigenetic modifications that are found in the genome and predict precisely what their consequences will be for gene expression. We’ll work out how to

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disease symptoms are caused and the story is remarkable. It pulls together a number of the themes we have already encountered, showing how junk DNA, epigenetics, genetic fossils and abnormal RNA processing all work together to create an extraordinary tale of pathological conspiracy.1 Let’s recap a little. On normal

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junk sequence. But there is yet more to the picture. The FSHD retrogene only becomes stably expressed in the presence of a particular pattern of epigenetic modifications. In normal cells, the FSHD repeats are usually expressed when the cells are in a pluripotent state, such as embryonic stem cells. At

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this stage, the FSHD repeats are covered with activating epigenetic modifications. But as the cells differentiate, the activating modifications are replaced by repressive ones, and the region is silenced. But if pluripotent cells are created

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repeated region and the rest of chromosome 4. The protein 11-FINGERS (see page 178) binds to this region and ensures that different patterns of epigenetic modifications are maintained in the FSHD domain compared with the adjacent areas of the chromosome. On top of all these features, the three-dimensional structure

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RNAs, splice signal sites, untranslated regions, promoters and enhancers. Layer on to this the effects of variations in DNA sequence between individuals, directed and random epigenetic modifications, changeable three-dimensional interactions, plus binding to other RNAs and proteins; then add in the effects of our constantly altering environment. Figure 20.2

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Bickmore WA, Barroso I, Pritchard JK, Gilad Y, Segal E. Genomics: ENCODE explained. Nature. 2012 Sep 6;489(7414) 14. For a fascinating example of epigenetic transgenerational inheritance see this paper, in which a fear response was passed on from parent to pups: Dias BG, Ressler KJ. Parental olfactory experience influences

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Junk DNA is vital in control of imprinting, including the involvement of imprinting control regions, promoters, long non-coding RNAs and cross-talk with the epigenetic systems. Aplastic anaemia Around 5 per cent of cases are caused by mutations in some of the critical genes that maintain the lengths of telomeres

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Junk DNA is vital in control of imprinting, including the involvement of imprinting control regions, promoters, long non-coding RNAs and cross-talk with the epigenetic systems. Burkitt’s lymphoma Caused when the Myc oncogene from chromosome 8 gets translocated to chromosome 14 and placed under the control of the immunoglobulin

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regions at the ends of chromosomes, are now generally accepted as having a causal role in the progression of some tumours. Mis-targeting of epigenetic enzymes to the wrong genes because of abnormal expression of long non-coding RNAs is also under active investigation as another method by which cancer

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Junk DNA is vital in control of imprinting, including the involvement of imprinting control regions, promoters, long non-coding RNAs and cross-talk with the epigenetic systems. Retinitis pigmentosa Some cases are caused by a defect in a protein which is required to ensure normal splicing and removal of junk DNA

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Junk DNA is vital in control of imprinting, including the involvement of imprinting control regions, promoters, long non-coding RNAs and cross-talk with the epigenetic systems. Spinal muscular atrophy The SMN2 gene is unable to compensate for mutations in the closely related SMN1 gene, because of a variant base pair

Human Diversity: The Biology of Gender, Race, and Class

by Charles Murray  · 28 Jan 2020  · 741pp  · 199,502 words

changing self-concept.” “The second premise is wrong because some aspects of the nonshared environment can be affected by outside interventions.” “But you’re ignoring epigenetics!” “The First Premise Is Wrong for Some Important Outcomes” In the Polderman meta-analysis discussed in chapter 11, there were exceptions to the generalization that

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possible that aspects of the nonshared environment can be affected by outside interventions? The prospects are, to borrow a word, gloomy. “But You’re Ignoring Epigenetics!” Raise the topic of genes’ role in affecting human behavior, and chances are good that someone is going to tell you that you’re hopelessly

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behind the times. Epigenetics has proved that alterations in the environment can change our genes, and therefore traditional beliefs about inborn characteristics are outdated and irrelevant. It’s no

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been reporting it for years. Time magazine explained “Why Your DNA Isn’t Your Destiny” back in 2010, with the subtitle “The new field of epigenetics is showing how your environment and your choices can influence your genetic code—and that of your kids.”57 In 2013, Discover magazine told us

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too. Here’s Tara Swart, holder of a PhD in neuropharmacology from King’s College London, writing in Forbes: The new and evolving science [of epigenetics] tells us that our gene expression is malleable, influenced by external stressors and lifestyle choices, from running outside to who you have your coffee break

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with. Rather than having a set genetic blueprint, epigenetics demonstrates that although our genes themselves are fixed, our genetic expression, much of which is heritable, is also interconnected with a wide range of environmental

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factors.60 With rare exceptions, the mainstream media’s reporting on the science behind epigenetics bears little resemblance to what’s actually been discovered. The Basics Your personal double helix of DNA resides in the nucleus of a cell. The

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involve a class of chemical modifications to DNA or to components of the “packaging” of DNA (chromatin) that has led to what is now called epigenetics. The word epigenesis was first used in 1651 by William Harvey to describe the developmental process that allows the homogeneous fertilized egg to become a

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Waddington’s definition. Nanney described two types of cellular control systems. One consisted of “genetics systems” that are involved in transcription. The other consisted of “epigenetic systems” that were auxiliary mechanisms for determining whether expression occurred, and if so, its intensity.62 Nanney’s article also drew attention to what would

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become a major aspect of epigenetics: “persistent homeostasis,” referring to cellular memory that survives cell division.63 What caused “persistent homeostasis”? Collapsing decades of research into a few sentences and simplifying

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, the answer turned out to be epigenetic marks of two kinds: those caused by DNA methylation and those caused by histone modifications. I will concentrate on DNA methylation, which has been more

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this short description. THE DNA DOESN’T CHANGE No one claims that the DNA code is modified by environmental events. All the scientific claims involving epigenetics, correct and incorrect, are about changes in gene expression, not changes in DNA. For DNA methylation, the genetic mark can be thought of as a

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your respiratory system. That the environment interacts with genes to change the phenotype temporarily is not news. It happens all the time. The distinctiveness of epigenetic change lies in the cellular memory of methylation that survives cell duplication. Suppose that a negative environmental event early in childhood not only caused temporary

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of capabilities and outcomes across groups. As these potential extensions of findings about gene expression sank in during the 2000s, the use of the term epigenetics expanded to include all forms of transmission of the phenotype by mechanisms that did not involve changes in the DNA sequence—in other words, to

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Nanney’s emphasis on cellular memory and instead treat the larger realm of transmission of the phenotype through RNA and transcription factors as part of epigenetics.66 For John Greally, director of the Center for Epigenomics at the Albert Einstein College of Medicine, this is too broad a definition, conflating changes

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reasons because a change in DNA methylation can be an effect instead of a cause.67 But for better or worse, the broad interpretation of epigenetics has taken hold and a correspondingly broad research agenda based on it has been pursued for two decades. What has been found? The Claims of

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the Advocates The first significant claims for epigenetic change were tailor-made to feed into both the optimism and the media excitement: They dealt with the effects of maternal love in infancy. The

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article “Epigenetic Programming by Maternal Behavior,” published in 2004 (first author was Ian Weaver), reported that rat pups who received high levels of arched-back nursing plus

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are consistent with the hypothesis that the associations between exposure to an adverse environment during early development and health outcomes in adulthood are mediated by epigenetic factors. The specific causal mechanism awaits elucidation.71 In other words, what happened to the children in utero probably affected DNA methylation in ways similar

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of their adult offspring, the authors (first author was Rachel Yehuda) reported, “This is the first demonstration of an association of preconception parental trauma with epigenetic alterations that is evident in both exposed parent and offspring, providing potential insight into how severe psychophysiological trauma can have intergenerational effects.”72 The key

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of scientists, and finally wins acceptance as the geezers die off (“Science advances one funeral at a time”).75 But that’s not how the epigenetics debate is being conducted within the profession. Epigeneticists who are still young themselves and doing cutting-edge work see their discipline as the victim of

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a hijacking. In their view, too many epigenetics enthusiasts are reaching conclusions and publishing them without understanding the science that already exists. For John Greally, the Yehuda study of Holocaust survivors “is pretty

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typical of all epigenetics studies today for being uninterpretable.”76 Geneticist Graham Coop had a Twitter response to the New York Review of Books article that began, “Utter nonsense

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generation—the week that the New York Review of Books article came out, evolutionary biologist Jerry Coyne’s blog began with “Another lousy article on epigenetics.” For those who want to pursue the debate, I can point you to an exchange that gives you an overview of the issues and references

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sources. The protagonists are neuroscientist Kevin Mitchell and Jill Escher, a well-known advocate for autistic children. Mitchell’s case against the popularized version of epigenetics began with two long scholarly appraisals of the data posted on his blog, Wiring the Brain, in January 2013.77 In May 2018 he returned

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, Germline Exposures, with a list of 49 references documenting her allegation that Mitchell cherry-picked studies to make his case and ignored abundant evidence of epigenetic inheritance in mammals. She was as blunt as Mitchell: Sloppy overstatement and dogmatism from the Ivory Tower, such as Mitchell’s blog post, can breed

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outspoken academicians to distort the state of the science, unchallenged.79 Four days later, Mitchell responded to Escher with another detailed methodological critique of the epigenetics literature.80 If you’re wondering how an outsider is to form an opinion, I sympathize. Of the many complex topics in this book, I

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the Institut für Humangenetik at the University of Duisburg-Essen, has expressed the problems at greater length by putting together a “roadmap to proving transgenerational epigenetic inheritance.” I’ve consigned it to a note because it is long and technical—but that’s my point.[86] The accounts of the transgenerational

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in the reviews of the literature at face value, their applications are far down the road. My point with regard to Proposition #10 is limited. Epigenetics properly understood is a vibrant field with findings that have important medical implications. But as far as I can tell, no serious epigeneticist is prepared

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underpinnings. The gloomy prospect for systematically affecting the nonshared environment seems vindicated. Nothing in the pipeline shows promise of overturning the negative results to date. Epigenetics as portrayed in the media has no relevance to Proposition #10 for the foreseeable future. The widespread popular belief that environmental pressures routinely and permanently

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found multiple reports of associations between the quality of childhood experience and the methylation status of the [relevant receptors].” “Recent evidence supports the hypothesis that epigenetic plasticity is sustained in the brain throughout adulthood, potentially as a mechanism to cope with the evolving demands of the environment; yet, there are clear

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constitutes humans’ stress response system] occurs at multiple levels of the HPA axis in addition to effects on hippocampal GR expression.” “The initial reports of epigenetic regulation of hippocampal GR expression are now accompanied by reports of environmentally regulated alterations in the methylation status of multiple genes directly implicated in HPA

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author is the director of the Institut für Humangenetik at the University of Duisburg-Essen. Here is his account of “the roadmap to proving transgenerational epigenetic inheritance” on pages 2 and 3 of 3: 1. Rule out genetic, ecological and cultural inheritance. For studies in mice and rats, inbred strains and

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investigation. Unfortunately, if you don’t find anything, you still cannot be 100% sure that a genetic variant does not exist. 2. Identify the responsible epigenetic factor in the germ cells. Admittedly, this is easier said than done, especially in female germ cells, which are scarce or unavailable. Be aware that

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molecular testing, for example by methylation analysis of imprinted genes, which are fully methylated or fully unmethylated only in germ cells. 3. Demonstrate that the epigenetic factor in the germ cells is responsible for the phenotypic effect in the next generation. If possible, remove the factor from the affected germ cells

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is gained.… In light of [the problems of doing such experiments in humans], this might currently be too much to ask for to prove transgenerational epigenetic inheritance in humans, but should, nevertheless, be kept in mind and discussed. Despite some unfamiliar technical language, enough of Horsthemke’s description of the roadmap

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pronouncement about the state of knowledge, here is Horsthemke’s closing paragraph: In conclusion, in my opinion, even if the molecular mechanisms exist to transmit epigenetic information across generations in humans, it is very likely that the transgenerational transmission of culture by communication, imitation, teaching and learning surpasses the effects of

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our ability to detect this phenomenon. Cultural inheritance has certainly had an adaptive role in the evolution of our species, but the evidence for transgenerational epigenetic inheritance, as laid out above, is not (yet) conclusive. For now, I remain skeptical. 87. I am referring to the phenomenon known as regression to

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Children and Adolescents Referred to the Gender Identity Development Service in the UK (2009–2016).” Archives of Sexual Behavior 47: 1301–4. Deichmann, Ute. 2016. “Epigenetics: The Origins and Evolution of a Fashionable Topic.” Developmental Biology 416: 249–54. de LaCoste-Utamsing, Christine, and Ralph L. Holloway. 1982. “Sexual Dimorphism in

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and the Politics of Knowledge: Moral Foundations Theory and Disciplinary Controversies.” American Sociologist 49 (4): 459–95. Horsthemke, Bernhard. 2018. “A Critical View on Transgenerational Epigenetic Inheritance in Humans.” Nature Communications 9 (1): 2973. Huerta-Sanchez, Emilia, Xin Jin, Asan et al. 2014. “Altitude Adaptation in Tibetans Caused by Introgression of

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, Hajnalka Kompagne, Hajnalka Orvos et al. 2007. “Gender-Related Differences in Neonatal Imitation.” Infant and Child Development 16 (3): 267–76. Nanney, D. L. 1958. “Epigenetic Control Systems.” Proceedings of the National Academy of Sciences 44 (7): 712. Narasimhan, Vagheesh M., Raheleh Rahbari, Aylwyn Scally et al. 2017. “Estimating the Human

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: Providing Support for the Null Hypothesis.” European Journal of Social Psychology 49 (4): 717–34. Perez, Marcos Francisco, and Ben Lehner. 2019. “Intergenerational and Transgenerational Epigenetic Inheritance in Animals.” Nature Cell Biology 21: 143–51. Peterson, Jennifer. 2018. “Gender Differences in Verbal Performance: A Meta-analysis of United States State Performance

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: A Critical Review.” Educational Psychologist 41 (4): 207–25. Waterland, Robert A., and Randy L. Jirtle. 2003. “Transposable Elements: Targets for Early Nutritional Effects on Epigenetic Gene Regulation.” Molecular and Cellular Biology 23 (15): 5293. Watson, John Broadus. 1914. Behavior: An Introduction to Comparative Psychology. New York: H. Holt. . 1924. Behaviorism

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. H. Strogatz. 1998. “Collective Dynamics of ‘Small-World’ Networks.” Nature 393: 440–42. Weaver, Ian C. G., Nadia Cervoni, Frances A. Champagne et al. 2004. “Epigenetic Programming by Maternal Behavior.” Nature Neuroscience 7: 847. Weidenreich, F. 1946. Apes, Giants, and Man. Chicago: University of Chicago Press. Weiner, Jonathan. 1994. The Beak

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-Related Small-World Structural Cortical Networks in Young Adults: A DTI Tractography Study.” Cerebral Cortex 21 (2): 449–58. Yeager, Ashley. 2019. “Classic Mechanism of Epigenetic Inheritance Is Rare, Not the Rule.” The Scientist (March 1). Yeager, David S., P. Hanselman, G. M. Walton et al. 2019. “Where Does a Scalable

A Hunter-Gatherer's Guide to the 21st Century: Evolution and the Challenges of Modern Life

by Heather Heying and Bret Weinstein  · 14 Sep 2021  · 384pp  · 105,110 words

, we have developed a simple model for understanding the hierarchical nature of the forces at play. We call it the Omega principle. The Omega Principle Epigenetic means “above the genome.” The first time either of us encountered the term was in college in the early ’90s. At that time it was

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culture—has a powerful influence on where bodies go, and what they do. In this way, culture is a regulator of genome expression. The term epigenetic has in more recent decades taken on a different meaning. The term is now almost exclusively used to refer to mechanisms that directly—molecularly—regulate

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genome would be alike, and any large collection of cells could exist only as a colony of undifferentiated cells. It is only through the tight, epigenetic regulation of gene expression that we can have an animal or a plant composed of well-coordinated, distinct, multicellular tissues. While the meaning of the

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term epigenetic has gone through a radical transformation, from describing inherited behavior to describing only molecular switches, a strong argument can be made that the category of

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epigenetic phenomena actually includes both types of regulators: molecular switches are the narrow meaning of the term—epigenetic sensu stricto (“in the strict sense”), while the molecular switches plus inherited behaviors are

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epigenetic sensu lato (“in the broad sense”). Both are epigenetic, and the implication is that a single evolutionary rule governs both molecular and cultural

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our teaching of evolution to students, we have codified our understanding of the relationship between genetic and epigenetic phenomena in what we call the Omega principle. It has two elements:17 Omega Principle Epigenetic regulators, such as culture, are superior to genes in that they are more flexible and can adapt more

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rapidly. Epigenetic regulators, such as culture, evolve to serve the genome. We have chosen to use the signifier Ω (omega) to call to mind π (pi), and

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evolutionary with genetic traits became entrenched in popular culture, as in the specious dichotomy of “nature versus nurture.” Again, remember the Omega principle (genes and epigenetic phenomena such as culture are inextricably linked, and they evolved together to advance the genes). Asking “Nature or nurture?” isn’t wrong simply because the

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of a given adaptive trait. Humans have many EEAs, not just that of the African savannahs and coasts inhabited by our early hunter-gatherer ancestors. epigenetics: sensu stricto: Regulators of gene expression that are not encoded in the DNA sequence itself (e.g., DNA methylation). sensu lato: Any heritable trait not

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due directly to changes in DNA sequence. It includes epigenetic (sensu stricto) phenomena and, for example, culture. eusociality: A social system in which some individuals forgo reproduction in order to facilitate the reproduction of others

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come with a cost to conspecifics. Compare with zero-sum. Omega principle (as introduced in this book): Epigenetic phenomena (sensu lato) are evolutionarily superior to genetic phenomena in that they are more rapidly adaptable. Epigenetic phenomena (sensu lato) are downstream of genetics, so ultimately, genetics are in control. paradox: The inability to

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Worst. New York: Penguin Press. More technical texts that are nonetheless excellent include: Jablonka, E., and Lamb, M. J., 2014. Evolution in Four Dimensions: Genetic, Epigenetic, Behavioral, and Symbolic Variation in the History of Life. Revised edition. Cambridge, MA: MIT Press. West-Eberhard, M. J., 2003. Developmental Plasticity and Evolution. New

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energy/materials costs with variation, and test of adaptation, 45 entheogens, 96, 98, 220 Environments of Evolutionary Adaptedness (EEA), xv, 78 See also adaptive evolution epigenetic, 14–17 ergot fungi, 96 Estabrook, George, 195–96 eukaryotes, 20 eusociality, 131 exercise, 62–63 explosive gases, 55–56 extinction, 12, 29 fairness, and

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Gatto, John Taylor, 165 gay men, 136 generalists, 5–6, 7, 11, 49–50, 215 genes/genome, 14 culture as genome expression regulator, 14–17 epigenetic, 14–15 genital mutilation, 117 genocide, 13 geographic frontiers, 224–25, 226 germ theory of disease, 67 gestation, 27 gibbons, 32, 127, 129 glossary, 251

The Future of the Brain: Essays by the World's Leading Neuroscientists

by Gary Marcus and Jeremy Freeman  · 1 Nov 2014  · 336pp  · 93,672 words

connections per cubic millimeter of brain tissue. Moreover, neurons come in hundreds (or perhaps thousands) of functionally distinct cell types with unique morphologies and molecular (epigenetic) identities. Synaptic connections can be excitatory or inhibitory and can transmit information using more than one hundred distinct neurotransmitter molecules. These connections change strength, break

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matter and energy on our planet. The fourth important lesson learned was that genes are not everything. It is becoming more and more apparent that epigenetic mechanisms—which alter transcription or expression of genes—are critical for constructing a brain that is highly adapted to the context in which it develops

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and in which the animal will ultimately live. Conrad Waddington first used the term epigenetics in the middle of the last century in an effort to explain cellular differentiation during development. If there is a one-to-one correspondence between

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from brain cells (neurons) to liver cells. Because of this, Waddington proposed that the mechanisms through which a genotype produces a phenotype should be termed epigenetics. Considering that cellular phenotypes undergo dramatic plasticity during development while the genotype of these cells remains stable implicit in Waddington’s definition is the notion

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that a phenotype can be altered without changes to the genotype. Thus during the course of development, epigenetic mechanisms (such as DNA methylation, a biochemical process that reduces gene expression in specific portions of the brain and body) allow cells with the same

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into account the fact that an organism does not remain static throughout the lifespan, but rather it dynamically responds to social and environmental contexts, then epigenetic mechanisms might also mediate the adaptability of brain and behavior to the environment. Recent work from the laboratories of Michael Meaney and Frances Champagne indicates

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that variation in early development induces epigenetic variation (in DNA methylation for example) and may serve as a mechanism for developmental plasticity. For example, alterations in nutrition, stress, and maternal care early

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in life can trigger these epigenetic mechanisms and generate anatomical and functional changes to the brain and body, which alters behavior of the offspring. These alterations in behavior can be sustained

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across generations via epigenetic effects on portions of the neuroendocrine system, or in some instances persist through epigenetic effects on the germ line. The dramatic role that epigenetic mechanisms play in shaping brain and behavior is well exemplified in humans. Anatomical alterations

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some aspects of the body, brain, and behavior, but these features will always be couched with cultural evolution and will emerge and often persist through epigenetic mechanisms. Finally, for all I have learned, probably the most important revelation in my own journey has been the continuing and exhilarating process of realizing

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to be more difficult than curing the diverse set of pathologies known as cancer; both are highly heterogeneous diseases with an inexhaustible multiplicity of genetic, epigenetic, and environmental causes, but because of mosaicity, the complexity was even greater for the brain. Brainbot treatment is expensive. And like most medical procedures, it

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encoding schemes, 214 Engert, Florian, 18 entorhinal cortex: grid cells in, of rat brain, 71, 72f; spatial cell types in, 74–76 epigenetic mechanisms: brain and behavior, 189, 190 epigenetics, 189 epilepsy, 194, 219, 230, 236, 240, 242, 266 ethics: human brain simulations, 268–69; whole brain simulation, 123 EurExpress, 9 European

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Commission, 111, 195 European Community, 94 Evans, Alan, 5, 10, 14 event related potentials (ERPs): consciousness, 172–73 evolution: brain organization, 190–91; epigenetic mechanisms, 189–90; neocortex during course of, 188–89; quest for species differences, 191–92; science dictating process, 191; studying various species, 186–87; understanding

The Cancer Chronicles: Unlocking Medicine's Deepest Mystery

by George Johnson  · 26 Aug 2013  · 465pp  · 103,303 words

’t the Message”…Flying farolitos … A visit to MD Anderson … Rothko’s brooding chapel CHAPTER 9 Deeper into the Cancer Cell A physics of cancer … Epigenetic software … The stem cell conundrum … An enormous meeting in Orlando … Espresso and angiogenesis … The news from Oz.…Communing with the microbiome … Beyond the double helix

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some genes are exposed and others are obscured. Alterations like these, which change a cell’s function while leaving its DNA otherwise unscathed, are called epigenetic. “Epi-,” coming from ancient Greek, can mean “over,” “above,” “upon.” Just as a cell has a genome, it also has an epigenome—a layer of

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suggests is that cancer may not be only a matter of broken genes. Disturbances to a cell—carcinogens, diet, or even stress—might rearrange the epigenetic tags without directly mutating any DNA. Suppose that a methyl group normally keeps an oncogene—one that stimulates cellular division—from being expressed. Remove the

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hold mitosis in check. Freed to proliferate, the cell would be vulnerable to more copying errors. So epigenetic changes would lead to genetic changes—and these genetic changes could conceivably affect methylation, triggering more epigenetic changes … and round and round it goes. Outside the laboratory enthusiasm for this scenario is driven both

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by hope and by fear. Epigenetics might provide a way for a substance to act as a carcinogen even though it has been shown incapable of breaking DNA. But unlike genetic

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damage, these changes might be reversible. How big a role epigenetics plays remains uncertain. Like everything that happens in a cell, methylation and the modification of histones are controlled by genes—and these have been found

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different cancers. Maybe it all comes down to mutations after all. On the other hand, a few scientists have proposed that cancer actually begins with epigenetic disruptions, setting the stage for more wrenching transformations. Even more unsettling is a contentious idea called the cancer stem cell theory. In a developing embryo

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to be a single transistor might turn out to be a microchip within the microchip hiding more dense circuitry of its own. Stem cells and epigenetics might come to play a greater role. In the end there may be more than six hallmarks. The hope is that the number will be

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actually lower lung cancer risk. While the alpha particles are causing potentially carcinogenic mutations, low-level x-ray, gamma, and beta radiation may be activating epigenetic circuitry involved with DNA repair and apoptosis and enhancing the immune response. If that is true then reducing exposure to the EPA’s recommended action

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somehow elicits malignant behavior, interfering with a crucial cellular pathway by amplifying or squelching it. The oscillations might conceivably suppress the immune system or have epigenetic influences—activating methylation or some other chemical reaction that can affect the output of genes without directly mutating the DNA. But all of that is

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. “For decades now”: Hanahan and Weinberg, “The Hallmarks of Cancer” (italics added). 4. don’t necessarily have to occur through mutations: The seminal paper on epigenetics is Andrew P. Feinberg and Bert Vogelstein, “Hypomethylation Distinguishes Genes of Some Human Cancers from Their Normal Counterparts,” Nature 301, no. 5895 (January 6, 1983

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.html] For a historical overview see Andrew P. Feinberg and Benjamin Tycko, “The History of Cancer Epigenetics,” Nature Reviews Cancer 4, no. 2 (February 2004): 143–53. [http://www.ncbi.nlm.nih.gov/pubmed/14732866] Epigenetic changes in germ cells—sperm or eggs—might even be passed from parent to child, though

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(February 15, 2012): 299–310. [http://www.ncbi.nlm.nih.gov/pubmed/22182599] 6. proposed that cancer actually begins with epigenetic disruptions: Andrew P. Feinberg, Rolf Ohlsson, and Steven Henikoff, “The Epigenetic Progenitor Origin of Human Cancer,” Nature Reviews Genetics 7, no. 1 (January 2006): 21–33. [http://www.ncbi.nlm.nih

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. [http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3057636] 30. low-level x-ray, gamma, and beta radiation: Bobby R. Scott et al., “Radiation-stimulated Epigenetic Reprogramming of Adaptive-response Genes in the Lung: An Evolutionary Gift for Mounting Adaptive Protection Against Lung Cancer,” Dose-Response 7, no. 2 (2009): 104

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testing, 11.1, 11.2 epidemiology, 10.1, 10.2, 10.3, 11.1 of cancer shortcomings of self-reporting in, 2.1, 10.1 epigenetic theory, 9.1, 9.2, 11.1 epigenome, 9.1, 9.2 epithelial-mesenchymal transition (EMT) Epstein, Samuel Erbitux Erin Brockovich, Erivedge (vismodegib) Ernst, Max

The Gene: An Intimate History

by Siddhartha Mukherjee  · 16 May 2016  · 824pp  · 218,333 words

is very high. In fact, we have to start wondering why it isn’t higher. Why isn’t the figure 100 percent? —Nessa Carey, The Epigenetics Revolution Genes have had a glorious run in the 20th century. . . . They have carried us to the edge of a new era in biology, one

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genes, he surmised, enabling each cell to stamp the marks of its identity on its genome. He termed the phenomenon “epi-genetics”—or “above genetics.” Epigenetics, Waddington wrote, concerns “the interaction of genes with their environment [ . . .] that brings their phenotype into being.” A macabre human experiment provided evidence for Waddington’s

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to an embryonic cell, thus reversing biological time. It might even undo the fixity of human memory, of identity—of choice. Until the late 1950s, epigenetics was more fantasy than reality: no one had witnessed a cell layering its history or identity above its genome. In 1961, two experiments performed less

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in developmental time. That mark could not live in the sequence of genes themselves, but had to be etched above them: it had to be epigenetic. Gurdon returned to Waddington’s question: What if every cell carries an imprint of its history and its identity in its genome—a form of

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cellular memory? Gurdon had visualized an epigenetic mark in an abstract sense, but he hadn’t physically seen such an imprint on the frog genome. In 1961, Mary Lyon, a former student

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of Waddington’s, found a visible example of an epigenetic change in an animal cell. The daughter of a civil servant and a schoolteacher, Lyon began her graduate work with the famously cantankerous Ron Fisher

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the X chromosome. The random inactivation of the X chromosome causes one cell to have a color pigment, while its neighbor has a different color. Epigenetics, not genetics, solves the conundrum of a female tortoiseshell cat. (If humans carried the skin color gene on their X chromosomes, then a female child

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molecular “cancellation sign”—to the DNA in that chromosome. Since the genes themselves were intact, such a mark had to be above genes—i.e., epigenetic, à la Waddington. In the late 1970s, scientists working on gene-silencing discovered that the attachment of a small molecule—a methyl group—to DNA

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genes. The ellipses and punctuation marks denote the introns, the intergenic regions, and regulatory sequences. The boldface and capitalized letters and the underlined words are epigenetic marks appended to the genome to impose a final layer of meaning. This was the reason that Gurdon, despite all his experimental ministrations, had rarely

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developmental time to become an embryonic cell and then a full-fledged frog: the genome of the intestinal cell had been tagged with too many epigenetic “notes” for it to be easily erased and transformed into the genome of an embryo. Like human memories that persist despite attempts to alter them

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might be able to write a thousand novels from the same script. But Young Adult Fiction, once scripted, cannot easily be reformatted into Victorian Romance. Epigenetics partially solves the riddle of a cell’s individuality—but perhaps it can also solve the more tenacious riddle of an individual’s individuality. “Why

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that particular madeleine in Paris—impinge on one twin and not the other. Genes are turned “on” and “off” in response to these events, and epigenetic marks are gradually layered above genes.III Every genome acquires its own wounds, calluses, and freckles—but these wounds and calluses “exist” only because they

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reactivation would become overwhelmed by it. As with Funes, the capacity to use any memory functionally depends, paradoxically, on the ability to silence memory. An epigenetic system exists to allow the genome to function. Its ultimate purpose is to establish the individuality of cells. The individuality of organisms is, perhaps, an

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unintended consequence. Perhaps the most startling demonstration of the power of epigenetics to reset cellular memory arises from an experiment performed by the Japanese stem-cell biologist Shinya Yamanaka in 2006. Like Gurdon, Yamanaka was intrigued by

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the embryo-like cell, they uncovered a cascade of events. Circuits of genes were activated or repressed. The metabolism of the cell was reset. Then, epigenetic marks were erased and rewritten. The cell changed shape and size. Its wrinkles unmarked, its stiffening joints made supple, its youth restored, the cell could

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in their genomes decades after the Hongerwinter. Historical memory was thus transformed into cellular memory. A note of caution: epigenetics is also on the verge of transforming into a dangerous idea. Epigenetic modifications of genes can certainly superpose historical and environmental information on cells and genomes—but this capacity is limited, idiosyncratic

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with obesity and overnourishment, while a father with the experience of tuberculosis, say, does not produce a child with an altered response to tuberculosis. Most epigenetic “memories” are the consequence of ancient evolutionary pathways, and cannot be confused with our longing to affix desirable legacies on our children. As with genetics

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in the early twentieth century, epigenetics is now being used to justify junk science and enforce stifling definitions of normalcy. Diets, exposures, memories, and therapies that purport to alter heredity are

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pregnancy—lest they taint all their children, and their children, with traumatized mitochondria. Lamarck is being rehabilitated into the new Mendel. These glib notions about epigenetics should invite skepticism. Environmental information can certainly be etched on the genome. But most of these imprints are recorded as “genetic memories” in the cells

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—and, as if to close a circle, at that very same institution—Allis’s experiments would vindicate Allfrey’s “histone hypothesis.” III. The permanence of epigenetic marks, and the nature of memory recorded by these marks, has been questioned by the geneticist Mark Ptashne. In Ptashne’s view, shared by several

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other geneticists, master-regulatory proteins—previously described as molecular “on” and “off” switches—orchestrate the activation or repression of genes. Epigenetic marks are laid down as a consequence of gene activation or repression, and may play an accompanying role in regulating gene activation and repression, but

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of the genes was firmly shut down, resulting in an inert gene that did not make RNA or protein. Years later, scientists would discover that epigenetic marks had been placed on viral genes to silence them. We now know that cells have ancient detectors that recognize viral genes and stamp them

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genes, they leave plenty of opportunity for potent forms of gene modification. Master regulators that affect dozens of genes are common in human biology. An epigenetic modifier may be designed to change the state of hundreds of genes with a single switch. The genome is replete with such nodes of intervention

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renewed verve and urgency—in part, because the current technologies have brought us to a precipice. A combination of stem cell technologies, nuclear transfer and epigenetic modulation, and gene-editing methods has made it conceivable that the human genome can be broadly manipulated, and that transgenic humans can be created. We

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sessions—to recover. Or, perhaps a different therapy altogether that doesn’t rely on exposure, like interpersonal therapy, or medication.” Perhaps drugs that can erase epigenetic marks are prescribed in combination with talk therapy. Perhaps the erasure of cellular memories can ease the erasure of historical memories. Genetic diagnoses and genetic

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for our species. * * * I. To understand how genes become actualized into organisms, it is necessary to understand not just genes, but also RNA, proteins, and epigenetic marks. Future studies will need to reveal how the genome, all the variants of proteins (the proteome), and all the

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epigenetic marks (the epigenome) are coordinated to build and maintain humans. II. Comprehensive testing of fetal genomes has already entered clinical practice, under the name of

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studies), Inder Verma (gene therapy), Jennifer Doudna (genome editing), Nancy Wexler (human gene mapping), Marcus Feldman (human evolution), Gerald Fishbach (schizophrenia and autism), David Allis (epigenetics), Francis Collins (gene mapping and the Human Genome Project), Eric Topol (human genetics), and Hugh Jackman (Wolverine; mutants). Ashok Rai, Nell Breyer, Bill Helman, Gaurav

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“code” in the strand and the sequence is converted (transcribed) into RNA and then translated into proteins. Enzyme: A protein that accelerates a biochemical reaction. Epigenetics: The study of phenotypic variations that are not caused by changes in the primary DNA sequence (i.e., A, C, T, G) but by chemical

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intellectual traits, such as skin color or eye color. Phenotypes can also include complex traits, such as temperament or personality. Phenotypes are determined by genes, epigenetic alterations, environments, and random chance. Protein: A chemical comprised, at its core, of a chain of amino acids that is created when a gene is

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. “a devil, a born devil”: William Shakespeare, The Tempest, act 4, scene 1. The Hunger Winter Identical twins have exactly the same: Nessa Carey, The Epigenetics Revolution: How Modern Biology Is Rewriting Our Understanding of Genetics, Disease, and Inheritance (New York: Columbia University Press, 2012), 5. Genes have had a glorious

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Hastings, Armageddon: The Battle for Germany, 1944–1945 (New York: Alfred A. Knopf, 2004), 414. In the 1980s, however: Bastiaan T. Heijmans et al., “Persistent epigenetic differences associated with prenatal exposure to famine in humans,” Proceedings of the National Academy of Sciences 105, no. 44 (2008): 17046–49. “aptitude for doing

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cell: The Japanese scientist Susumu Ohno had hypothesized about X inactivation before the phenomenon was discovered. simple organisms, such as yeast: K. Raghunathan et al., “Epigenetic inheritance uncoupled from sequence-specific recruitment,” Science 348 (April 3, 2015): 6230. In his remarkable story “Funes the Memorious”: Jorge Luis Borges, Labyrinths, trans. James

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–213. the eventual effects of these gene-environment: Albert H. C. Wong, Irving I. Gottesman, and Arturas Petronis, “Phenotypic differences in genetically identical organisms: The epigenetic perspective,” Human Molecular Genetics 14, suppl. 1 (2005): R11–R18. Also see Nicholas J. Roberts et al., “The predictive capacity of personal genome sequencing,” Science

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, and James D. Watson, eds. Phage and the Origins of Molecular Biology. Cold Spring Harbor, NY: Cold Spring Harbor Laboratory Press, 1968. Carey, Nessa. The Epigenetics Revolution: How Modern Biology Is Rewriting Our Understanding of Genetics, Disease, and Inheritance. New York: Columbia University Press, 2012. Chesterton, G. K. Eugenics and Other

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, 386, 491 Augustinians, Mendel’s life among, 17–18, 49 Auschwitz concentration camp, Germany, 129, 130, 137–38, 502 autism, 276 creativity in, 448, 449 epigenetics used to alter, 406 mismatch between genome and environment in, 265, 482 mutations in, 406, 444, 444n, 454, 503 autoimmune disease, 453 Avery, Oswald background

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, 76 Eliot, George, 75 Elledge, Steve, 182n Ellis, Havelock, 75–76 embryonic development brain synapses during, 445n diagnosing fetal mutations using maternal blood during, 450 epigenetics used to alter, 406 interaction of genes and environment in, 392–93 interplay of genes and epigenes in, 407 nuclear transfer technique in, 396–99

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research on bird population evolution affected by, 37–38, 45n disease from mismatch between genetic endowment and, 264–65 as engine driving evolution, 108, 176 epigenetic modifications of genes and, 406–07, 409–10 flow of biological information and, 410 gender determination and gender identity and, 367, 379 genetic memory of

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cutting and pasting DNA using, 205–06, 207, 210–11, 213, 280, 472n DNA replication with, 180–81, 288 epigenes, interplay of genes with, 407 epigenetics, 393–410 dangerous aspects of possible applications of, 406–07, 408–09 histone marking of molecular memory on genes and, 402 individuality of cells and

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, 355–56, 367–68 sexual reassignment and, 363–67 transgender identity and, 368 use of term, 356 of women with Swyer syndrome, 363 gene activation epigenetic marks and, 403n, 418 external triggers for, 107 gene regulation using, 401 gene-silencing and, 399–400, 401 histone marking of molecular memory and, 401

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by, 476 permanent and heritable changes on human embryonic stem cells using, 475 scientists’ proposal for a moratorium on use of, 476–77 gene expression epigenetic marks and, 403n gene-silencing and, 400 genomic code controlling multiple genes for, 325 Hongerwinter experience and reformatting of, 405–06 incomplete penetrance and variability

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, 9 in schizophrenia, 8, 129, 261, 262, 276, 298–300, 303, 442, 445n, 449, 453, 503 genetic memory cell’s capacity to selectively silence, 403 epigenetics used to alter, 406 experience transmitted to next generation in, 395–96 gene transmission in, 396 histone marking of molecular memory on genes and, 401

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schizophrenia and, 448 sperm banks (repository) for choosing, 274, 276 genome editing (genomic surgery), 472 Genome Project. See Human Genome Project genomes cancer and, 9 epigenetic system for functioning of, 402–03 evolutionary history seen in, 333n mismatch between environment and, 264–65, 482 publication of draft sequence of, 13 sequencing

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on theory of, 41–43, 46, 57 de Vries on particles of information in, 58, 60, 61, 62 encoding of basic information in, 25–26 epigenetics used to alter, 406 eugenics and laws of, 74 Galton’s research on, 65–70, 74, 103 gemmule theory of, 43–44, 57, 66, 113

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in, 263 Marvel Comics, 266 Marxism, 396 massively parallel DNA sequencing, 443, 450 master-regulatory genes, 403n alterations in cell lineages in worms using, 392 epigenetic marks and, 403n factors affecting impact of, 195, 387, 392 influence of environment and, 408 Lewis’s discovery of process of, 187 Swyer syndrome with

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A Brief History of Everyone Who Ever Lived

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The Science of Language

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Psychopathy: An Introduction to Biological Findings and Their Implications

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The Impact of Early Life Trauma on Health and Disease

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Science in the Soul: Selected Writings of a Passionate Rationalist

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The Village Effect: How Face-To-Face Contact Can Make Us Healthier, Happier, and Smarter

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The Evolution of Everything: How New Ideas Emerge

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Is the Internet Changing the Way You Think?: The Net's Impact on Our Minds and Future

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The Telomere Effect: A Revolutionary Approach to Living Younger, Healthier, Longer

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Full Catastrophe Living (Revised Edition): Using the Wisdom of Your Body and Mind to Face Stress, Pain, and Illness

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A Dominant Character

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Editing Humanity: The CRISPR Revolution and the New Era of Genome Editing

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The Singularity Is Nearer: When We Merge with AI

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100 Years of Identity Crisis: Culture War Over Socialisation

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Complexity: A Guided Tour

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From Bacteria to Bach and Back: The Evolution of Minds

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The Wisdom of Psychopaths: What Saints, Spies, and Serial Killers Can Teach Us About Success

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Testosterone Rex: Myths of Sex, Science, and Society

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A Culture of Growth: The Origins of the Modern Economy

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Fiber Fueled: The Plant-Based Gut Health Program for Losing Weight, Restoring Your Health, and Optimizing Your Microbiome

by Will Bulsiewicz  · 15 Dec 2020  · 431pp  · 99,919 words

The Singularity Is Near: When Humans Transcend Biology

by Ray Kurzweil  · 14 Jul 2005  · 761pp  · 231,902 words

Grain Brain: The Surprising Truth About Wheat, Carbs, and Sugar--Your Brain's Silent Killers

by David Perlmutter and Kristin Loberg  · 17 Sep 2013

Practical Manual of Thyroid and Parathyroid Disease

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The End of Illness

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Dopamine Nation: Finding Balance in the Age of Indulgence

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Jaws

by Sandra Kahn,Paul R. Ehrlich  · 15 Jan 2018

Superintelligence: Paths, Dangers, Strategies

by Nick Bostrom  · 3 Jun 2014  · 574pp  · 164,509 words

The Deep Learning Revolution (The MIT Press)

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QI: The Third Book of General Ignorance (Qi: Book of General Ignorance)

by John Lloyd and John Mitchinson  · 28 Sep 2015  · 432pp  · 85,707 words

Radiant Rest

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The Future Is Faster Than You Think: How Converging Technologies Are Transforming Business, Industries, and Our Lives

by Peter H. Diamandis and Steven Kotler  · 28 Jan 2020  · 501pp  · 114,888 words

Getting Past Your Past: Take Control of Your Life With Self-Help Techniques From EMDR Therapy

by Francine Shapiro  · 26 Mar 2013  · 358pp  · 112,735 words

The Extended Phenotype: The Long Reach of the Gene

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Tightrope: Americans Reaching for Hope

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Crack-Up Capitalism: Market Radicals and the Dream of a World Without Democracy

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Beautiful Data: The Stories Behind Elegant Data Solutions

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Mind Wide Open: Your Brain and the Neuroscience of Everyday Life

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The Lucky Years: How to Thrive in the Brave New World of Health

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Life at the Speed of Light: From the Double Helix to the Dawn of Digital Life

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Life Is Simple: How Occam's Razor Set Science Free and Shapes the Universe

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The Spirit Level: Why Greater Equality Makes Societies Stronger

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Bourgeois Dignity: Why Economics Can't Explain the Modern World

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Our Kids: The American Dream in Crisis

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The Children of the Sky

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How Emotions Are Made: The New Science of the Mind and Brain

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A Devil's Chaplain: Selected Writings

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The End of My Addiction

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Rapt: Attention and the Focused Life

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Just Keep Calm & Take Some Magnesium - Why a "Boring" Mineral Is Suddenly Hot Property for Soothing Bodies and Calming Minds

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In Our Own Image: Savior or Destroyer? The History and Future of Artificial Intelligence

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Average Is Over: Powering America Beyond the Age of the Great Stagnation

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Future Files: A Brief History of the Next 50 Years

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The Barbell Prescription: Strength Training for Life After 40

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Upstream: The Quest to Solve Problems Before They Happen

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Breath: The New Science of a Lost Art

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Science Fictions: How Fraud, Bias, Negligence, and Hype Undermine the Search for Truth

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Secrets of the Autistic Millionaire: Everything I Know Now About Autism and Asperger's That I Wish I'd Known Then

by David William Plummer  · 14 Sep 2021

Autistic Community and the Neurodiversity Movement: Stories From the Frontline

by Steven K. Kapp  · 19 Nov 2019

CRISPR People: The Science and Ethics of Editing Humans

by Henry T. Greely  · 22 Jan 2021

The Microbiome Solution

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Longevity: To the Limits and Beyond (Research and Perspectives in Longevity)

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Energy and Civilization: A History

by Vaclav Smil  · 11 May 2017

The Greatest Show on Earth: The Evidence for Evolution

by Richard Dawkins  · 21 Sep 2009

Payback: Debt and the Shadow Side of Wealth

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The Health Gap: The Challenge of an Unequal World

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Tomorrowland: Our Journey From Science Fiction to Science Fact

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The Blind Watchmaker; Why the Evidence of Evolution Reveals a Universe Without Design

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Uncharted: How to Map the Future

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The Passenger

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Aurora

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Neurodiversity at Work: Drive Innovation, Performance and Productivity With a Neurodiverse Workforce

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The WEIRDest People in the World: How the West Became Psychologically Peculiar and Particularly Prosperous

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Fluke: Chance, Chaos, and Why Everything We Do Matters

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The Genetic Lottery: Why DNA Matters for Social Equality

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Autism: A Very Short Introduction

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Spectrum Women: Walking to the Beat of Autism

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Growth: From Microorganisms to Megacities

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The Coming Wave: Technology, Power, and the Twenty-First Century's Greatest Dilemma

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Surviving AI: The Promise and Peril of Artificial Intelligence

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Advances in Artificial General Intelligence: Concepts, Architectures and Algorithms: Proceedings of the Agi Workshop 2006

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This Will Make You Smarter: 150 New Scientific Concepts to Improve Your Thinking

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Richard Dawkins: How a Scientist Changed the Way We Think

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Drink?: The New Science of Alcohol and Your Health

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Dead People Suck: A Guide for Survivors of the Newly Departed

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In Pursuit of Memory: The Fight Against Alzheimer's

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The Fourth Industrial Revolution

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The Confidence Game: The Psychology of the Con and Why We Fall for It Every Time

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Everything That Makes Us Human: Case Notes of a Children's Brain Surgeon

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Choked: Life and Breath in the Age of Air Pollution

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The Mutant Project: Inside the Global Race to Genetically Modify Humans

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Been There, Done That: A Rousing History of Sex

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Beautiful Visualization

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Smarter Faster Better: The Secrets of Being Productive in Life and Business

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100 Plus: How the Coming Age of Longevity Will Change Everything, From Careers and Relationships to Family And

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Food Allergy: Adverse Reactions to Foods and Food Additives

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Wireless

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The Relentless Revolution: A History of Capitalism

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Black Box Thinking: Why Most People Never Learn From Their Mistakes--But Some Do

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If You're So Smart, Why Aren't You Happy?

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Age of Discovery: Navigating the Risks and Rewards of Our New Renaissance

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Who's Your City?: How the Creative Economy Is Making Where to Live the Most Important Decision of Your Life

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Overwhelmed: Work, Love, and Play When No One Has the Time

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The 5 AM Club: Own Your Morning. Elevate Your Life.

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The Stolen Year

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A Poison Like No Other: How Microplastics Corrupted Our Planet and Our Bodies

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A City on Mars: Can We Settle Space, Should We Settle Space, and Have We Really Thought This Through?

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We're Not Broken: Changing the Autism Conversation

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Wasteland: The Dirty Truth About What We Throw Away, Where It Goes, and Why It Matters

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Nexus: A Brief History of Information Networks From the Stone Age to AI

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The Controlled Demolition of the American Empire

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Discovering the Inner Mother: A Guide to Healing the Mother Wound and Claiming Your Personal Power

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Empire of Ants: The Hidden Worlds and Extraordinary Lives of Earth's Tiny Conquerors

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Israel: A Simple Guide to the Most Misunderstood Country on Earth

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Emergence

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The Driver in the Driverless Car: How Our Technology Choices Will Create the Future

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The Rapture of the Nerds

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What About Me?: The Struggle for Identity in a Market-Based Society

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Antisemitism: Here and Now

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Rule Britannia: Brexit and the End of Empire

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AIQ: How People and Machines Are Smarter Together

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Blueprint: The Evolutionary Origins of a Good Society

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How to Create a Mind: The Secret of Human Thought Revealed

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Antifragile: Things That Gain From Disorder

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NeuroTribes: The Legacy of Autism and the Future of Neurodiversity

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Geek Heresy: Rescuing Social Change From the Cult of Technology

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The Sovereign Individual: How to Survive and Thrive During the Collapse of the Welfare State

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The Case Against Sugar

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Deep Medicine: How Artificial Intelligence Can Make Healthcare Human Again

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Countdown: Our Last, Best Hope for a Future on Earth?

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Quit Like a Woman: The Radical Choice to Not Drink in a Culture Obsessed With Alcohol

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Calling Bullshit: The Art of Scepticism in a Data-Driven World

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My Father's Brain: Life in the Shadow of Alzheimer's

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The Quantum Magician

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When Computers Can Think: The Artificial Intelligence Singularity

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What to Think About Machines That Think: Today's Leading Thinkers on the Age of Machine Intelligence

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The Organized Mind: Thinking Straight in the Age of Information Overload

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Blue Mars

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Heart of the Machine: Our Future in a World of Artificial Emotional Intelligence

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Robots Will Steal Your Job, But That's OK: How to Survive the Economic Collapse and Be Happy

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The End of Theory: Financial Crises, the Failure of Economics, and the Sweep of Human Interaction

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Culture Warlords: My Journey Into the Dark Web of White Supremacy

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Cultish: The Language of Fanaticism

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Dark Laboratory: On Columbus, the Caribbean, and the Origins of the Climate Crisis

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More Everything Forever: AI Overlords, Space Empires, and Silicon Valley's Crusade to Control the Fate of Humanity

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