International Journal of Epidemiology, 2015, Vol. 44, No. 4 1109 International Journal of Epidemiology, 2015, 1109–1112 Commentary: Far-reaching doi: 10.1093/ije/dyv024 hypothesis or a step too far: Advance Access Publication Date: 7 April 2015 the inheritance of acquired characteristics Luke Isbel and Emma Whitelaw* LaTrobe Institute of Molecular Science, LaTrobe University, Melbourne, VIC, Australia *Corresponding author. LaTrobe Institute of Molecular Science, LaTrobe University Bundoora, Melbourne, VIC, Australia 3086. E-mail:
[email protected] Downloaded from https://academic.oup.com/ije/article/44/4/1109/669284 by guest on 29 September 2021 A quarter of a century ago, Eva Jablonka and Marion J Does it ever happen? Lamb put forward a model (reprinted in this issue of IJE) Putting aside the question of mechanism, one of the con- to explain how the functional history of a gene might influ- tinuing problems with the hypothesis is the scant evidence 1 ence its expression in subsequent generations. They were for the inheritance of acquired characteristics. Although particularly interested in the idea that an environmental the authors propose a phenomenon that occurs across all stimulus acting on the parent could alter the behaviour of a phyla, they acknowledge that there is greater opportunity gene in the offspring. The model is simple and is depicted for the inheritance of acquired epigenetic marks in organ- in Figure 1. The environment stimulates a change in tran- isms such as plants, in which the germ cells arise from som- scription that is associated with chemical modifications to atic cells. In contrast, the mammalian germ line segregates the DNA or to the proteins that package the DNA.These early in development, providing less opportunity.