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Male-driven evolution.

Wen Hsiung Li1, Soojin Yi, Kateryna Makova

  • 1Department of Ecology and Evolution University of Chicago 1101 East 57th Street, Chicago, Illinois 60637, USA. whli@uchicago.edu

Current Opinion in Genetics & Development
|November 16, 2002
PubMed
Summary

The male mutation rate bias (alpha) in primates is debated. Recent studies suggest strong male-driven evolution in hominoids, with alpha around 5.3, possibly influenced by replication and recombination factors.

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Area of Science:

  • Evolutionary biology
  • Genetics
  • Primate evolution

Background:

  • The magnitude of male-driven evolution, quantified by the sex ratio of mutation rate (alpha), is controversial in primates.
  • Previous estimates for higher primates placed alpha between 4-6, but recent human studies suggested a lower value of approximately 2.

Purpose of the Study:

  • To resolve the controversy surrounding the strength of male-driven evolution in hominoids.
  • To investigate regional variations in mutation rates and their potential causes.

Main Methods:

  • Comparative genomic analysis of mutation rates between male and female germlines.
  • Examination of mutation rates in noncoding DNA fragments, including a Y-chromosome region and a homologous region on chromosome 3.
  • Statistical analysis to estimate the male-to-female mutation rate ratio (alpha).

Main Results:

  • A recent study estimated alpha to be 5.3 in hominoids, supporting strong male-driven evolution.
  • Evidence for significant variation in mutation rates across different genomic regions was found.
  • GC content and recombination were identified as potential factors influencing regional mutation rate variation.

Conclusions:

  • Strong male-driven evolution is likely in higher primates, with alpha around 5.3.
  • While germ cell DNA replication errors are a major mutation source, replication-independent factors like recombination may also contribute significantly.
  • Understanding regional mutation rate variation is crucial for evolutionary genetic studies.

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