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Dramatic founder effects in Amerindian mitochondrial DNAs.

D C Wallace, K Garrison, W C Knowler

    American Journal of Physical Anthropology
    |October 1, 1985
    PubMed
    Summary
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    Southwestern American Indian mitochondrial DNA (mtDNA) revealed Asian genetic markers at unique frequencies. This suggests early Amerindian tribes originated from small female groups that have since developed distinct genetic mutations.

    Area of Science:

    • Genetics
    • Anthropology
    • Population Studies

    Background:

    • Mitochondrial DNA (mtDNA) analysis is crucial for tracing maternal lineage and population history.
    • Understanding the genetic origins of Native American populations is a key area of anthropological research.

    Purpose of the Study:

    • To analyze Southwestern American Indian mitochondrial DNA (mtDNA) for genetic markers and compare them to Asian populations.
    • To investigate the founding lineages and subsequent genetic divergence of Amerindian tribes.

    Main Methods:

    • Restriction fragment length polymorphism (RFLP) analysis was performed on Southwestern Amerindian mitochondrial DNAs (mtDNAs).
    • Comparison of observed RFLP frequencies with those found in Asian populations.

    Main Results:

    Related Experiment Videos

    • Amerindian mtDNAs exhibited Asian restriction fragment length polymorphisms (RFLPs) but at significantly different frequencies.
    • A rare Asian HincII RFLP was identified in 40% of the Amerindian samples.
    • Novel mtDNAs, not previously observed on other continents, were discovered.
    • Distinctive mtDNAs were identified among different Amerindian tribes.

    Conclusions:

    • Southwestern Amerindian tribes were likely founded by a small number of female lineages.
    • New mutations have become fixed in these maternal lineages since their separation from Asian ancestral populations.
    • mtDNA analysis provides insights into the peopling of the Americas and subsequent population dynamics.