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Migration versus mutation in the evolution of recombination under multilocus selection

K V Pylkov1, L A Zhivotovsky, M W Feldman

  • 1Vavilov Institute of General Genetics, Russian Academy of Sciences, Moscow, Russia.

Genetical Research
|August 26, 1998
PubMed
Summary
This summary is machine-generated.

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Modifier theory reveals recombination evolution. Increased recombination requires negative epistasis under mutation-selection and migration-selection balance, with conditions varying based on epistasis strength and linkage.

Area of Science:

  • Evolutionary genetics
  • Population genetics
  • Theoretical biology

Background:

  • Recombination plays a crucial role in evolution by facilitating genetic variation.
  • Understanding the evolutionary dynamics of recombination under different selective pressures is essential.

Purpose of the Study:

  • To compare the evolution of recombination under mutation-selection balance and migration-selection balance models using modifier theory.
  • To investigate the influence of epistasis and linkage on the spread of recombination modifiers.

Main Methods:

  • Application of modifier theory to analyze the evolution of recombination rates.
  • Modeling weak multilocus selection acting on loosely linked loci.
  • Examination of selectively neutral modifier loci controlling recombination.

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Main Results:

  • The success of recombination modifiers depends on epistasis (sign and magnitude) and linkage.
  • Increased recombination requires negative (synergistic) epistasis under both mutation-selection and migration-selection balance.
  • Weak epistasis favors increased recombination under mutation-selection balance but not migration-selection balance.

Conclusions:

  • Stronger negative epistasis introduces a critical recombination value influencing modifier invasion.
  • Under mutation-selection balance, recombination increases if linked below a critical value; under weak migration, it must be above.
  • Results are consistent across haploid and diploid populations.