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Mechanisms of molecular evolution.

T Ohta1

  • 1National Institute of Genetics, Mishima, Japan. tohta@lab.nig.ac.jp

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|December 29, 2000
PubMed
Summary

The nearly neutral theory explains molecular evolution, highlighting that both genetic drift and selection shape nucleotide substitutions. Weak selection

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Area of Science:

  • Evolutionary biology
  • Molecular evolution
  • Population genetics

Background:

  • Genetic drift and selection are key drivers of nucleotide substitutions.
  • The nearly neutral theory integrates these forces to explain molecular evolution.
  • Understanding weak selection is crucial for evolutionary insights.

Purpose of the Study:

  • To present the nearly neutral theory with a focus on weak selection.
  • To review existing facts supporting the nearly neutral theory.
  • To discuss the role of recombination in molecular evolution.

Main Methods:

  • Theoretical review of the nearly neutral theory.
  • Analysis of selection coefficients and environmental diversity.
  • Examination of illegitimate recombination events and gene families.

Main Results:

  • The mean selection coefficient is negative, with variance influenced by environmental diversity.
  • Illegitimate recombination events like duplications and deletions impact molecular evolution.
  • Gene duplication and conversion contribute to new gene functions, driven by positive selection.

Conclusions:

  • Both genetic drift and selection are active in the evolution of gene families.
  • The nearly neutral theory provides a framework for understanding nucleotide substitutions.
  • Recombination plays a significant role in the evolution of novel gene functions.

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