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Epigenetics in adaptive evolution and development: the interplay between evolving species and epigenetic mechanisms: extract from Trygve Tollefsbol (ed.) (2011) Handbook of epigenetics--the new molecular and medical genetics. Chapter 26. Amsterdam, USA: Elsevier, pp. 423-446.

By comparing epigenetics of current species with fossil records across evolutionary transitions, we can gauge the moment of emergence of some novel mechanisms in evolution, and recognize that epigenetic mechanisms have a bearing on mutation. Understanding the complexity and changeability of these mechanisms, as well as the changes they can effect, is both fascinating and of vital practical benefit. Our most serious pandemics of so-called 'non-communicable' diseases - mental and cardiovascular disorders, obesity and diabetes, rooted in the 'metabolic syndrome' - are evidently related to effects on our evolutionary mechanisms of agricultural and food industrialization, modern lifestyle and diet. Pollution affects us directly as well as indirectly by its destruction of ecologically essential biosystems. Evidently such powerful conditions of existence have epigenetic effects on both our health and our continuing evolution. Such effects are most profound during reproductive and developmental processes, when levels of hormones, as affected by stress particularly, may be due to modern cultures in childbearing such as excessive intervention, separation, maternal distress and disruption of bonding. Mechanisms of genomic imprinting seem likely to throw light on problems in assisted reproductive technology, among other transgenerational effects.

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