ArticleProceedings. Biological sciences2025
Adaptive epigenetic divergence can facilitate ecological speciation.
Article in Proceedings. Biological sciences, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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1 citing paper in PubMed.
- Adaptive epigenetic divergence can facilitate ecological speciation.Proceedings. Biological sciences · 2025Article
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6 authors.
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Abstract
Migration between populations homogenizes genetic divergence and can thus prevent speciation. However, environmentally induced epigenetic marks can remain divergent between populations despite migration. Thus, epigenetic variation might facilitate speciation under conditions where it is challenging for genetic barriers to gene flow to establish. Here, we develop a model to test this hypothesis by quantifying reproductive isolation (RI) at a neutral genetic locus linked with an epigenetic locus under divergent selection. This also allows us to test how RI is influenced by (i) the degree of induction of epigenetic state by the environment and (ii) the transmission of epigenetic state between generations. With a high migration rate, we find that an epigenetic locus, which is highly inducible, produces stronger RI than an equivalent genetic locus. Furthermore, at lower migration rates, the strength of RI produced by an epigenetic locus increases when epigenetic state is more transmissible between generations. Our findings suggest three regimes of speciation by divergent selection at an epigenetic locus, whereby highly inducible epigenetic marks could give way to more transmissible epigenetic marks and ultimately genetic differentiation, as ecological speciation progresses.
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