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Related Experiment Videos

Mitochondrial DNA diversity in gorillas

K J Garner1, O A Ryder

  • 1Center for Reproduction of Endangered Species, Zoological Society of San Diego, California 92112, USA.

Molecular Phylogenetics and Evolution
|August 1, 1996
PubMed
Summary

Mitochondrial DNA analysis reveals distinct genetic profiles for gorilla subspecies. Western lowland gorillas exhibit high variability, while eastern lowland and mountain gorillas show closer relationships, with indistinguishable Bwindi and Virunga populations.

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Area of Science:

  • Primate genetics
  • Molecular anthropology
  • Evolutionary biology

Background:

  • Mitochondrial DNA (mtDNA) control regions are valuable for assessing genetic diversity and evolutionary relationships.
  • Gorilla taxonomy includes three recognized subspecies: western lowland (Gorilla gorilla gorilla), eastern lowland (Gorilla gorilla graueri), and mountain gorillas (Gorilla gorilla beringei).
  • Previous studies have debated the subspecies classification of certain gorilla populations.

Purpose of the Study:

  • To sequence the mitochondrial DNA control region in gorillas to evaluate genetic variability.
  • To clarify the subspecies identity of wild gorilla populations.
  • To examine the phylogenetic relationships among the three recognized gorilla subspecies.

Main Methods:

  • Sequencing of the mitochondrial DNA control region.

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  • Analysis of genetic variability in 63 free-living and captive gorillas.
  • Comparative sequence analysis across different subspecies and populations.

    • Main Results:

    • Eastern lowland and mountain gorilla sequences are distinct yet closely related, with low intra-subspecies variability.
    • Two isolated mountain gorilla populations (Virungas and Bwindi) are genetically indistinguishable using this mtDNA region.
    • Western lowland gorillas display high levels of mitochondrial D-loop DNA variability.
    • The genetic distance between divergent gorilla sequences approaches that between chimpanzees and bonobos.

    Conclusions:

    • Mitochondrial DNA sequencing effectively differentiates gorilla subspecies and clarifies population relationships.
    • The Bwindi Forest gorilla population is genetically similar to mountain gorillas, supporting their inclusion.
    • Significant genetic divergence exists within the gorilla species, highlighting conservation needs.