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Epigenetic inheritance, genetic assimilation and speciation.

C Pál1, I Miklós

  • 1Department of Plant Taxonomy and Ecology, Loránd Eötvös University, Budapest, Ludovika 2, H-1083, Hungary. babar@ludens.elte.hu

Journal of Theoretical Biology
|September 10, 1999
PubMed
Summary

Epigenetic inheritance systems facilitate speciation by allowing heritable phenotypic differences to accumulate, potentially reducing genetic barriers between populations and enabling evolution through suboptimal states.

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Area of Science:

  • Evolutionary biology
  • Genetics
  • Developmental biology

Background:

  • Epigenetic inheritance systems transmit environmentally induced phenotypes across generations.
  • Jablonka and Lamb proposed a significant role for these systems in speciation.
  • The accumulation of heritable phenotypic differences may precede genetic changes during population divergence.

Purpose of the Study:

  • To examine the plausibility of epigenetic inheritance systems driving speciation.
  • To analyze the behavior of epigenetic inheritance on adaptive landscapes.
  • To investigate the impact of epigenetic divergence on genetic barriers and reproductive isolation.

Main Methods:

  • Modeling epigenetic inheritance system behavior on a one-peak adaptive landscape.

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  • Analyzing the effect of diverging epigenetic marks on genetic barriers between adaptive peaks.
  • Considering environmental changes and genetic drift as initiators of peak shifts.

    • Main Results:

    • Epigenetic systems favor phenotypic variation when far from optimum and canalization near the optimum, leading to genetic assimilation.
    • Divergence in heritable epigenetic marks can reduce or eliminate genetic barriers between adaptive peaks.
    • Evolution can proceed through suboptimal phenotypic states, bypassing deep adaptive valleys.

    Conclusions:

    • Epigenetic inheritance systems can increase the probability of transitioning between adaptive states.
    • Speciation can be initiated by environmental changes or genetic drift affecting epigenetic variability.
    • Findings impact the understanding of reproductive isolation dynamics and evolutionary modes.