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Primate evolution of a human chromosome 1 hypervariable repetitive element.

K M Tynan1, D I Hoar

  • 1Department of Medical Biochemistry, University of Calgary, Alberta Childrens Hospital Research Centre, Canada.

Journal of Molecular Evolution
|March 1, 1989
PubMed
Summary
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This study identifies a human repetitive DNA sequence (hMF #1) present in primates but not rodents. Its varied distribution suggests clustered repeats may not reliably indicate primate evolutionary history.

Area of Science:

  • Genomics
  • Evolutionary Biology
  • Molecular Anthropology

Background:

  • Repetitive DNA sequences play roles in genome evolution and organization.
  • Understanding the distribution of repetitive elements across species can shed light on evolutionary relationships.

Purpose of the Study:

  • To characterize a specific human clustered DNA family (hMF #1).
  • To investigate the evolutionary conservation and phylogenetic utility of the hMF #1 sequence in primates.

Main Methods:

  • Restriction fragment length polymorphism (RFLP) analysis of human, mouse, and hamster DNA.
  • DNA dot blot and Southern DNA analysis for cross-species hybridization studies in primates.

Main Results:

  • The hMF #1 sequence is a 40 bp clustered repeat found on chromosome 1 with high copy numbers in humans.

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  • Significant homology was observed in higher primates and monkeys (suborder Anthropoidea), but not in prosimians or rodents.
  • Discrepancies were noted between hMF #1-based evolutionary predictions and established primate phylogeny.

    • Conclusions:

    • The hMF #1 sequence is conserved within the suborder Anthropoidea, suggesting an early origin in primate evolution.
    • The observed diversity in copy number and homology among closely related species indicates that clustered repetitive elements may be unreliable markers for phylogenetic analysis.