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DOES EVOLUTIONARY PLASTICITY EVOLVE?

Andreas Wagner1

  • 1Yale University, Department of Biology, Center for Computational Ecology, OML327, P.O. Box 208104, New Haven, Connecticut, 06520-8104.

Evolution; International Journal of Organic Evolution
|June 1, 2017
PubMed
Summary
This summary is machine-generated.

Epigenetic stability, the buffering of mutations by epigenetic interactions, can increase over evolutionary time. This impacts the rate of evolution by stabilizing phenotypes against genetic changes.

Keywords:
Developmental canalizationepigenetic systemepistatic gene interactionsgene networksneutral mutationstranscriptional regulators

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Area of Science:

  • Developmental Biology
  • Evolutionary Genetics
  • Systems Biology

Background:

  • Multicellular development involves complex epigenetic interactions.
  • Phenotypic variation is crucial for evolution, making the stability of phenotypes a key factor.
  • Epigenetic stability, the buffering of mutations by epigenetic interactions, is a hypothetical phenomenon that could influence evolutionary rates.

Purpose of the Study:

  • To investigate the phenomenon of epigenetic stability.
  • To explore whether epigenetic stability can evolve and affect evolutionary rates.
  • To model the impact of stabilizing selection on epigenetic stability.

Main Methods:

  • A biochemically motivated model of a gene regulatory network was developed.
  • Sets of mutually regulating transcriptional regulators were simulated.
  • The model analyzed changes in gene expression patterns under stabilizing selection.

Main Results:

  • Long periods of stabilizing selection significantly reduced mutations affecting gene expression patterns.
  • The model demonstrated an increase in epigenetic stability over time.
  • This increase in epigenetic stability was observed across various regulatory scenarios and was dependent on epistatic gene interactions.

Conclusions:

  • Epigenetic stability can increase through evolutionary processes, particularly under stabilizing selection.
  • This phenomenon, driven by epistatic interactions, can modulate the rate of evolution by buffering mutations.
  • Further experimental validation is suggested to explore epigenetic stability and its relation to developmental canalization.