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Related Experiment Videos

Neutrality tests of highly polymorphic restriction-fragment-length polymorphisms.

A G Clark1

  • 1Department of Biology, Pennsylvania State University, University Park 16802.

American Journal of Human Genetics
|November 1, 1987
PubMed
Summary

Neutral evolution models were tested using allele frequency data for the HRAS-1 and D14S1 loci. While generally fitting neutral expectations, HRAS-1 showed a diversity deficit, suggesting potential Harvey-ras oncogene selection.

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Area of Science:

  • Population Genetics
  • Molecular Evolution
  • Human Genetics

Background:

  • Restriction-fragment-length polymorphisms (RFPLPs) are crucial for studying genetic diversity.
  • Neutral evolution theory provides a baseline for genetic variation without selection.
  • The HRAS-1 and D14S1 loci are important in genetic studies.

Purpose of the Study:

  • To assess the goodness of fit of allele frequency data from Baird et al. to the infinite-alleles model of neutral evolution.
  • To investigate potential selective pressures on the HRAS-1 and D14S1 loci using Ewens-Watterson sampling theory.

Main Methods:

  • Analysis of allele frequency data using Ewens-Watterson sampling theory.
  • Testing goodness of fit to the infinite-alleles model.
  • Chi-squared tests to evaluate observed versus expected allele frequency distributions.

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Main Results:

  • Both HRAS-1 and D14S1 loci exhibited high diversity, with observed gene identity (F) and common allele frequency (C) not significantly differing from neutral expectations.
  • HRAS-1 allele frequencies tended towards a deficit in diversity, while D14S1 showed a slight excess.
  • Significant departures from neutral expectations were found in Caucasoid and Hispanic HRAS-1 distributions via chi-squared tests.

Conclusions:

  • The observed allele frequency distributions are largely consistent with neutral evolution, but deviations suggest potential locus-specific influences.
  • The HRAS-1 locus may be under selective pressure from the Harvey-ras oncogene.
  • The D14S1 locus's deviation might be due to hitchhiking effects linked to immunoglobulin genes.