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Human aconitase polymorphism in three samples from northeastern Brazil.

E S Azevêdo, M C Da Silva, A M Lima

    Annals of Human Genetics
    |July 1, 1979
    PubMed
    Summary
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    Human aconitase (ACONS) gene frequencies were analyzed in Brazilian populations with varying Black ancestry. Higher Black admixture correlated with increased frequencies of specific ACONS alleles, aligning with Nigerian gene patterns.

    Area of Science:

    • Population Genetics
    • Human Molecular Anthropology
    • Biochemical Genetics

    Background:

    • Human aconitase (ACONS) is a key enzyme in the citric acid cycle.
    • Genetic polymorphisms in ACONS can vary significantly across different human populations.
    • Understanding ACONS allele frequencies provides insights into population history and migration patterns.

    Purpose of the Study:

    • To investigate the genetic variation of human aconitase (ACONS) polymorphism.
    • To analyze ACONS allele frequencies in northeastern Brazilian populations.
    • To correlate ACONS allele frequencies with the degree of Black admixture in these samples.

    Main Methods:

    • Study of human aconitase (ACONS) polymorphism in three distinct Brazilian sample groups.
    • Collection of samples from the States of Bahia and Sergipe in northeastern Brazil.

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  • Analysis of ACONS allele frequencies in relation to the degree of Black admixture within each sample.

    • Main Results:

    • A positive correlation was observed between the degree of Black admixture and the frequencies of ACONS alleles ACONS4, ACONS2, and ACONS6.
    • Higher frequencies of these specific ACONS alleles were found in samples with greater Black ancestry.
    • The observed allele frequencies align with those found in present-day Nigerian populations.

    Conclusions:

    • The ACONS gene frequencies in northeastern Brazil reflect historical population admixture.
    • Findings support the historical presence of Yoruba populations in Bahia, as indicated by ACONS allele patterns.
    • ACONS polymorphism serves as a genetic marker for tracing ancestral origins and migration histories in admixed populations.