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African origin of human-specific polymorphic Alu insertions

M A Batzer1, M Stoneking, M Alegria-Hartman

  • 1Human Genome Center, Lawrence Livermore National Laboratory, CA 94551.

Proceedings of the National Academy of Sciences of the United States of America
|December 6, 1994
PubMed
Summary

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Polymorphic Alu insertions, a source of human genetic variation, reveal population structure and evolution. These human-specific DNA elements suggest an African origin for modern humans, supporting the recent African origin hypothesis.

Area of Science:

  • Genetics
  • Human Evolution
  • Population Genomics

Background:

  • Alu elements are mobile genetic sequences in primate genomes, with human-specific subfamilies present as polymorphisms.
  • Polymorphic Alu insertions are not fixed across all human chromosomes, offering insights into genetic variation.

Purpose of the Study:

  • To analyze four polymorphic human-specific Alu insertions to understand human population structure and evolution.
  • To determine the origin and evolutionary history of these Alu insertions.

Main Methods:

  • Utilized a PCR-based assay to genotype individuals based on the presence or absence of Alu elements.
  • Analyzed 664 individuals from 16 global population groups.
  • Constructed a maximum-likelihood tree of population relationships, including a hypothetical ancestral group.

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Main Results:

  • Four polymorphic Alu insertions were absent in nonhuman primates, indicating their origin after the human/African ape divergence.
  • Substantial genetic variation was observed within and significant differentiation among population groups.
  • Maximum-likelihood tree analysis suggested an African origin for these polymorphic Alu insertions, consistent with the recent African origin hypothesis.

Conclusions:

  • Polymorphic Alu insertions are valuable markers for studying human population structure and evolution.
  • The findings support the recent African origin hypothesis for modern humans.
  • These insertions represent unique, identifiable events in human genetic history.