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Related Experiment Videos

Signatures of population expansion in microsatellite repeat data

M Kimmel1, R Chakraborty, J P King

  • 1Department of Statistics, Rice University, Houston, Texas 77251, USA.

Genetics
|April 30, 1998
PubMed
Summary

Population expansion leaves a unique genetic signature. A bottleneck followed by population growth creates an imbalance in genetic variability, detectable in microsatellite DNA, particularly in Asian and European populations.

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Area of Science:

  • Population genetics
  • Evolutionary biology
  • Genomics

Background:

  • Genetic variability is shaped by population size changes.
  • Microsatellite loci are sensitive markers for detecting demographic events.
  • Previous models explored population growth effects on allele frequencies.

Purpose of the Study:

  • To investigate the genetic signature of population expansion using the Moran model.
  • To analyze the impact of asymmetric stepwise mutation on genetic variability.
  • To assess the relationship between allele size variance and heterozygosity during population growth.

Main Methods:

  • Utilized the time-continuous Moran model with growing population size.
  • Incorporated a general asymmetric stepwise mutation model.

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  • Calculated expected allele size variance and homozygosity for various growth models (stepwise, exponential, logistic).
  • Analyzed tetranucleotide repeat data from human populations.

    • Main Results:

    • Population bottlenecks followed by growth induce a transient imbalance between allele size variance and heterozygosity.
    • This imbalance is characterized by allele size variance exceeding equilibrium expectations.
    • Analysis of tetranucleotide repeat data revealed this imbalance in Asians and Europeans, but not Africans.
    • The degree of imbalance correlates with inferred timings of human population expansion.

    Conclusions:

    • The observed genetic imbalance provides evidence for past population bottlenecks and subsequent growth.
    • Findings support models of modern human population expansion with varying bottleneck timings across racial groups.
    • The imbalance index is a useful indicator but cannot solely determine the initiation time of population expansion.