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Related Experiment Videos

The pattern of neutral molecular variation under the background selection model

D Charlesworth1, B Charlesworth, M T Morgan

  • 1Department of Ecology and Evolution, University of Chicago, Illinois 60637-1573, USA. debchar@pondside.uchicago.edu

Genetics
|December 1, 1995
PubMed
Summary

Background selection reduces genetic diversity, mimicking a smaller population size. Tests for neutral evolution lack power to detect this effect, especially in species like Drosophila with low diversity in non-recombining regions.

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Area of Science:

  • Population genetics
  • Evolutionary biology
  • Molecular evolution

Background:

  • Genomic regions with low recombination are subject to background selection.
  • Background selection reduces genetic diversity by removing deleterious mutations.
  • The impact of background selection on genetic diversity is not fully understood.

Purpose of the Study:

  • To investigate the effects of background selection on genetic diversity using stochastic simulations.
  • To evaluate the power of statistical tests to detect deviations from neutral evolution under background selection.
  • To compare the effects of background selection with selective sweeps in empirical data.

Main Methods:

  • Stochastic simulations of the infinite sites model.
  • Coalescence-based methods to analyze allele frequency spectra.

Related Experiment Videos

  • Application of Tajima's, Fu and Li's, and Watterson's tests.

    • Main Results:

    • Background selection reduces genetic variability, similar to a decrease in effective population size.
    • Statistical tests for neutrality have low power to detect background selection, particularly with weak selection.
    • Empirical data from Drosophila with low diversity in low-recombination regions are consistent with background selection.

    Conclusions:

    • Background selection significantly impacts genetic diversity in non-recombining regions.
    • Current neutrality tests are often insufficient to distinguish background selection from neutral evolution.
    • Further research is needed to determine if background selection fully explains reduced diversity in restricted recombination regions.