The Relations between Genetics and Epigenetics

Abstract

I have tried to unpack the polysemy of the word epigenetics by adopting a historical point of view and by focusing on the models that were proposed at the beginning of the 1960s to explain variations in gene activity during cell differentiation and development. Most of the questions that were or are at the core of epigenetics were posed in this period. This was due to the fact that the regulatory models and their extension to the notion of the genetic program were proposed as genetic answers to the questions raised by Waddington when he defined epigenetics in the 1940s. Studies of DNA methylation and chromatin structure, which became increasingly important in the 1960s and 1970s, were seen as alternative explanations to the regulatory mechanisms that had been previously proposed. This historical detour shows that epigenetics cannot be defined per se, but only as an evolving opposition to the piecemeal, reductionist approach of genetics.

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