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DIFFERENTIATION OF A MULTIGENE FAMILY BETWEEN POPULATIONS.

Hidenori Tachida1

  • 1Department of Statistics, North Carolina State University, Box 8203, Raleigh, NC, 27695-8203.

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Intrachromosomal gene conversion drives multigene family differentiation within populations. This process promotes divergence at the same gene locus but can either promote or hinder divergence between different loci in recently separated populations.

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Area of Science:

  • Population Genetics
  • Molecular Evolution

Background:

  • Understanding the forces shaping genetic diversity within and between populations is crucial for evolutionary studies.
  • Gene families evolve under a complex interplay of mutation, recombination, gene conversion, and genetic drift.
  • Population size changes, common after divergence, significantly impact evolutionary trajectories.

Purpose of the Study:

  • To investigate the differentiation of multigene families between populations.
  • To analyze the impact of intrachromosomal unbiased gene conversion on genetic differentiation.
  • To model the effects of neutral mutation, recombination, and genetic drift on gene family evolution.

Main Methods:

  • Employed an infinite-site model without within-gene recombination.
  • Calculated average sequence differences between gene pairs within and between populations over time.
  • Utilized approximate and numerical methods to study time-dependent population behavior.

Main Results:

  • Intrachromosomal unbiased gene conversion promotes differentiation at the same locus.
  • The effect of gene conversion on differentiation between different loci is parameter-dependent, potentially promoting or retarding it.
  • Population size reduction post-divergence influences differentiation dynamics.

Conclusions:

  • Intrachromosomal gene conversion is a significant factor in multigene family differentiation.
  • The interplay between gene conversion and other evolutionary forces leads to complex patterns of divergence.
  • Gene conversion's role in differentiation is context-dependent, varying with locus and population history.