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Related Experiment Videos

A quantitative test of the neutral theory using pooled allozyme data

D O Skibinski1, M Woodwark, R D Ward

  • 1School of Biological Sciences, University College of Swansea, Singleton Park, Wales.

Genetics
|September 1, 1993
PubMed
Summary

Neutral theory suggests more genetic variation within species correlates with faster evolution. This study supports neutral theory, indicating neutral mutation rates explain most protein variation, with selection playing a minor role.

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Area of Science:

  • Evolutionary biology
  • Population genetics
  • Molecular evolution

Background:

  • Neutral theory predicts a positive correlation between intraspecific polymorphism and evolutionary rate.
  • Previous studies using allozyme and DNA data yielded conflicting results on selection and mutation drift's influence.
  • Pooling genetic data from diverse sources can provide robust conclusions on neutral theory's adequacy.

Purpose of the Study:

  • To test the prediction of neutral theory regarding polymorphism and evolutionary rate.
  • To analyze the relationship between heterozygosity and genetic distance across a wide range of species.
  • To quantitatively assess the contribution of neutral mutation rates versus selection to protein variation.

Main Methods:

  • Compiled a large database of allozyme variation from over 1500 species.

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  • Analyzed the correlation between heterozygosity (polymorphism) and genetic distance.
  • Utilized pooled genetic data for robust statistical analysis.

    • Main Results:

    • Found a positive correlation supporting neutral theory's prediction.
    • Demonstrated that a significant portion of protein variation is attributable to neutral mutation rate variation.
    • Indicated that strong selection explains only a minor fraction of observed protein variation.

    Conclusions:

    • The findings provide quantitative support for neutral theory in explaining protein polymorphism.
    • Neutral mutation rate variation is a primary driver of protein evolution.
    • Selection plays a less dominant role in shaping overall protein variation compared to neutral processes.