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Pleiotropic models of quantitative variation.

N H Barton1

  • 1Department of Genetics and Biometry, University College London, England.

Genetics
|March 1, 1990
PubMed
Summary
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Heritable variation in traits may arise as a side effect of gene mutations or balancing selection. This study explores how pleiotropic effects, where genes influence multiple traits, can maintain genetic diversity.

Area of Science:

  • Evolutionary genetics
  • Quantitative genetics
  • Population genetics

Background:

  • Genes often have pleiotropic effects, influencing multiple traits simultaneously.
  • Maintaining heritable variation in traits is a key question in evolutionary biology.
  • Strong stabilizing selection on numerous independent traits is theoretically limited.

Purpose of the Study:

  • To investigate the mechanisms maintaining heritable variation in traits.
  • To evaluate the roles of pleiotropic mutation and balancing selection in maintaining genetic variation.
  • To understand the apparent stabilizing selection observed on traits.

Main Methods:

  • Theoretical examination of genetic models.
  • Analysis of pleiotropic effects of mutation and balancing selection.

Related Experiment Videos

  • Modeling the impact of selection on trait phenotypes.

    • Main Results:

    • Heritable variation can be maintained as a pleiotropic side effect of mildly deleterious mutations (s ≈ 10^-3).
    • Balancing selection can maintain high heritabilities, but requires many weakly selected polymorphisms for significant artificial selection responses.
    • Apparent stabilizing selection on a trait can arise from pleiotropy, but is weak unless correlated with directly selected traits.

    Conclusions:

    • Pleiotropic effects of mutation and balancing selection are plausible mechanisms for maintaining genetic variation.
    • Observed strong stabilizing selection is likely due to correlations with a few directly selected traits, not widespread weak selection.
    • Distinguishing between these models requires specific experimental approaches.