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Waddington’s epigenetics or the pictorial meetings of development and genetics

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Abstract

In 1956, in his Principles of Embryology, Conrad Hal Waddington explained that the word “epigenetics” should be used to translate and update Wilhelm Roux’ German notion of “Entwicklungsmechanik” (1890) to qualify the studies focusing on the mechanisms of development. When Waddington mentioned it in 1956, the notion of epigenetics was not yet popular, as it would become from the 1980s. However, Waddington referred first to the notion in the late 1930s. While his late allusion clearly reveals that Waddington readily associated the notion of epigenetics with the developmental process, in the contemporary uses of the notion this developmental connotation seems to have disappeared. The advent and success of molecular biology have probably contributed to focusing biologists’ attention on the “genetic” or the “non-genetic” over the “developmental”. In the present paper, I first examine the links that exist, in Waddington’s work, between the classical notion of epigenesis in embryology and those of epigenetics that Waddington proposed to connect, and even synthesize, data both from embryology and genetics. Second, I show that Waddington’s own view of epigenetics has changed over time and I analyze how these changes appear through his many representations (both schematic or metaphorical images) of the relationships between genetic signals and developmental processes.

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Notes

  1. The Modern Synthesis was developed in the 1940s by evolutionary biologist and population geneticists. Consequently it has been argued by many evolutionary developmental biologists that the Modern Synthesis was promoting genetics at the expense of development.

  2. Gilbert’s arguments are the following one: because he was aware of the different kind of problems the two fields were dealing with, because he was a true interdisciplinary scientist, because he was able to assess some of the main philosophical differences between those two fields, and because he was sensitive to the aesthetic difference between genetics and embryology, between a certain form of simplicity as opposed to a certain picture of complexity (Gilbert 1991b; Gilbert and Browder 1991) and see also the nice 2002 paper of Linda van Speybroeck.

  3. See Stotz and Griffiths 2016.

  4. Another anthology prior to Dupont and Schmitt’s gives access to the founding texts in embryology in English: Willier and Oppenheimer 1974.

  5. The cell theory is the theory, which considers that every living organism is composed of units – the cells—characterized by their specific autonomy and their ability to divide (Virchow 1978).

  6. Name given to the early cells in an embryo.

  7. Note that Hans Driesch made several of his famous experiments on marine invertebrate embryos with Thomas Hunt Morgan (1866–1945) at a time when the latter was still mostly known as an embryologist. He started working on sex determination and genetics from 1900.

  8. Note that in 1924, Hilde Mangold was 26 years old. She discovered the phenomenon of embryonic induction, as well as what would then be called Spemann’s organizer, through experiments that she conducted during her Ph.D. thesis directed by Hans Spemann. Unfortunately she died in an accident the same year of her discovery. Therefore, in 1935 Hans Spemann received the Nobel Prize alone for this discovery, since Nobel prizes can only be given to people during their lifetime.

  9. See Robertson 1977 for precise biographical indications and also Gilbert 1991a, b.

  10. During his life, he wrote several popular scientific articles, mainly for Discovery (Robertson 1977).

  11. Even if in embryology the inducer could be external, it was clear that the cytoplasmic information was also central.

  12. Many geneticists would, in our time, embrace Waddington’s suggestion and try to identify the processes by which the genes of the genotype progressively give rise to phenotypic effects. One can think for instance of E. H. Davidson’s work on gene regulatory networks (Davidson 2006, 2009, 2010).

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Acknowledgements

I thank Charles Wolfe, Staffan Müller-Wille and Ohad Parnes for comments and insights on previous versions of this article. This work was supported financially by the “Who am I?” Laboratory of Excellence (ANR-11-LABX- 0071) funded by the French government through its “Investments for the Future” Program operated by the French National Research Agency (ANR) under Grant No ANR-11-IDEX-0005-02.

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Nicoglou, A. Waddington’s epigenetics or the pictorial meetings of development and genetics. HPLS 40, 61 (2018). https://doi.org/10.1007/s40656-018-0228-8

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