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Related Experiment Videos

Genealogies and weak purifying selection.

M Przeworski1, B Charlesworth, J D Wall

  • 1University of Chicago, Illinois 60637, USA. mfprzewo@harper.uchicago.edu

Molecular Biology and Evolution
|March 20, 1999
PubMed
Summary
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Purifying selection can lead to gene genealogies that appear neutral, but this masks selection's true effects on allele frequencies. Distinguishing between selected and neutral sites is crucial for interpreting DNA sequence variation data accurately.

Area of Science:

  • Population Genetics
  • Molecular Evolution
  • Bioinformatics

Background:

  • Tests of neutrality often assume selection alters gene genealogies compared to neutral expectations.
  • Previous studies on purifying selection yielded suggestive but incomplete results regarding gene genealogy shape.

Purpose of the Study:

  • To verify and extend findings on the effect of purifying selection on gene genealogies.
  • To investigate a wider range of models, including single-site and infinite-sites models.
  • To clarify the relationship between gene genealogies and allele frequency distributions under selection.

Main Methods:

  • Utilized the ancestral selection graph framework to analyze weak selection effects.
  • Modeled scenarios including a four-allele single-site model and an infinite-sites model.

Related Experiment Videos

  • Compared genealogical shapes and allele frequency spectra under selection versus neutral expectations.

    • Main Results:

    • Confirmed that weak purifying selection can produce gene genealogies indistinguishable from neutral expectations in single-site models.
    • Demonstrated that a neutral-seeming genealogy can coexist with detectable selection effects on allele frequency distributions.
    • Highlighted that information from selected sites cannot be solely reduced to their genealogy, necessitating a distinction from linked neutral variation.

    Conclusions:

    • A neutral gene genealogy does not preclude the action of selection on allele frequencies.
    • Accurate interpretation of DNA sequence variation requires differentiating between selected sites and linked neutral sites.
    • Under purifying selection, neutral mutation frequency spectra may not reflect patterns at replacement sites, even without recombination.