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Related Experiment Videos

Short tandem repeat polymorphism evolution in humans

F Calafell1, A Shuster, W C Speed

  • 1Department of Genetics, Yale University School of Medicine, New Haven, CT 06520-8005, USA.

European Journal of Human Genetics : EJHG
|October 22, 1998
PubMed
Summary
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Genetic variation analysis reveals African populations possess the highest diversity, with non-African variations appearing as a subset. This supports the replacement hypothesis for modern human origins.

Area of Science:

  • Population Genetics
  • Human Origins
  • Molecular Anthropology

Background:

  • Short tandem repeat (STR) polymorphisms are valuable genetic markers.
  • Global human genetic diversity patterns are crucial for understanding origins.
  • Previous studies often focused on European populations.

Purpose of the Study:

  • To assess the informativeness of 45 dinucleotide STRs across diverse global populations.
  • To investigate patterns of genetic diversity and their implications for human evolution.
  • To evaluate different models of genetic distance for phylogenetic reconstruction.

Main Methods:

  • Typing of 45 dinucleotide short tandem repeat polymorphisms.
  • Analysis of ten large, globally distributed population samples.

Related Experiment Videos

  • Calculation of heterozygosity, allele numbers, and genetic distances (FST and stepwise mutation model).

    • Main Results:

    • STR markers, selected for European heterozygosity, were informative globally.
    • African populations exhibited the highest genetic diversity (heterozygosity, allele number, private alleles).
    • Genetic variation in non-Africans appeared to be a subset of African variation.
    • FST-based genetic distances aligned better with archaeological evidence than stepwise mutation models.

    Conclusions:

    • The study provides strong genetic support for the recent African origin and replacement model of modern humans.
    • Global STR data reveal a hierarchical pattern of genetic diversity, with Africa as the primary source.
    • FST is a more robust measure for reconstructing deep human evolutionary history than stepwise mutation models.