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Related Experiment Videos

Estimating selection on nonsynonymous mutations.

Laurence Loewe1, Brian Charlesworth, Carolina Bartolomé

  • 1Institute of Evolutionary Biology, School of Biological Sciences, University of Edinburgh, Edinburgh EH9 3JT, United Kingdom. laurence.loewe@evolutionary-research.net

Genetics
|November 22, 2005
PubMed
Summary

Researchers developed new methods to study the fitness effects of mutations using polymorphism data. These methods help estimate the proportion of beneficial mutations and characterize deleterious mutations in species like Drosophila.

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Area of Science:

  • Evolutionary biology
  • Population genetics
  • Molecular evolution

Background:

  • The distribution of fitness effects (DFE) of mutations is crucial for understanding evolutionary processes.
  • Characterizing deleterious mutations and estimating the proportion of beneficial mutations are key challenges in evolutionary studies.

Purpose of the Study:

  • To develop and apply novel methods for characterizing the fitness effects of deleterious, nonsynonymous mutations.
  • To estimate the proportion of selectively favorable amino acid substitutions.
  • To investigate the distribution of mutational effects on fitness in natural populations.

Main Methods:

  • Developed two methods using polymorphism data from two related species (Drosophila miranda and D. pseudoobscura).
  • Methods account for different effective population sizes but assume a shared distribution of mutational effects.

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  • Incorporated mutation-selection balance and genetic drift models to estimate DFE parameters.

    • Main Results:

    • Found evidence for deleterious nonsynonymous mutations with small heterozygous selection coefficients (mean ~10^-5) in Drosophila.
    • A leptokurtic gamma distribution (shape parameter 0.1-1) effectively explains observed diversity.
    • The study suggests that a significant proportion of nonsynonymous mutations are deleterious.

    Conclusions:

    • The developed methods provide robust estimates of mutational effects on fitness.
    • The findings support a model where most nonsynonymous mutations are deleterious with small fitness effects.
    • A simple method for estimating the harmonic mean selection coefficient from single-species diversity data was also presented.