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Type: Journal article
Title: Intergenerational effects of manipulating DNA methylation in the early life of an iconic invader
Author: Sarma, R.R.
Crossland, M.R.
Eyck, H.J.F.
DeVore, J.L.
Edwards, R.J.
Cocomazzo, M.
Zhou, J.
Brown, G.P.
Shine, R.
Rollins, L.A.
Citation: Philosophical Transactions of the Royal Society B: Biological Sciences, 2021; 376(1826):20200125-20200125
Publisher: Royal Society Publishing
Issue Date: 2021
ISSN: 0962-8436
Statement of
Roshmi R. Sarma, Michael R. Crossland, Harrison J. F. Eyck, Jayna L. DeVore, Richard J. Edwards, Michael Cocomazzo ... et al.
Abstract: In response to novel environments, invasive populations often evolve rapidly. Standing genetic variation is an important predictor of evolutionary response but epigenetic variation may also play a role. Here, we use an iconic invader, the cane toad (Rhinella marina), to investigate how manipulating epigenetic status affects phenotypic traits. We collected wild toads from across Australia, bred them, and experimentally manipulated DNA methylation of the subsequent two generations (G1, G2) through exposure to the DNA methylation inhibitor zebularine and/or conspecific tadpole alarm cues. Direct exposure to alarm cues (an indicator of predation risk) increased the potency of G2 tadpole chemical cues, but this was accompanied by reductions in survival. Exposure to alarm cues during G1 also increased the potency of G2 tadpole cues, indicating intergenerational plasticity in this inducible defence. In addition, the negative effects of alarm cues on tadpole viability (i.e. the costs of producing the inducible defence) were minimized in the second generation. Exposure to zebularine during G1 induced similar intergenerational effects, suggesting a role for alteration in DNA methylation. Accordingly, we identified intergenerational shifts in DNA methylation at some loci in response to alarm cue exposure. Substantial demethylation occurred within the sodium channel epithelial 1 subunit gamma gene (SCNN1G) in alarm cue exposed individuals and their offspring. This gene is a key to the regulation of sodium in epithelial cells and may help to maintain the protective epidermal barrier. These data suggest that early life experiences of tadpoles induce intergenerational effects through epigenetic mechanisms, which enhance larval fitness. This article is part of the theme issue 'How does epigenetics influence the course of evolution?'
Keywords: Rhinella marina
alarm cue
Rights: © 2021 The Author(s) Published by the Royal Society. All rights reserved.
DOI: 10.1098/rstb.2020.0125
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