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A coalescence approach to gene conversion.

C Wiuf1

  • 1Department of Statistics, University of Oxford, Oxford, OX1 3TG, England.

Theoretical Population Biology
|July 20, 2000
PubMed
Summary

We developed a coalescent model incorporating gene conversion to study genetic variability. This model explains the lack of intralocus associations observed in species like Drosophila melanogaster.

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Area of Science:

  • Population Genetics
  • Molecular Evolution

Background:

  • Coalescent models are crucial for analyzing genetic variability and linkage disequilibrium.
  • Intralocus gene conversion significantly impacts genetic patterns within loci.

Purpose of the Study:

  • To develop a coalescent model that includes intralocus gene conversion.
  • To analyze the waiting time distribution for gene conversion events and the distribution of transferred segment endpoints.
  • To investigate the correlation between local trees under gene conversion and recombination.

Main Methods:

  • Derivation of the waiting time distribution for gene conversion events.
  • Determination of the distribution for the endpoints of transferred segments (sigma, tau).
  • Analysis of correlations between local trees at different genomic positions (chi(1) and chi(2)).

Main Results:

  • The correlation between local trees in a coalescent model with gene conversion (and no recombination) decays to a nonzero constant as the distance between positions increases.
  • The derived model, incorporating both recombination and gene conversion, can explain the observed lack of intralocus associations in populations such as Drosophila melanogaster.

Conclusions:

  • The developed coalescent model with intralocus gene conversion provides a framework for understanding genetic variability.
  • This model offers a potential explanation for the absence of intralocus associations in certain species, highlighting the interplay of recombination and gene conversion.

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