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Correlations between relatives for acrocentric association frequency

M Y Yip, D P Fox

    Human Genetics
    |January 1, 1981
    PubMed
    Summary
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    Acrocentric chromosome association frequency shows strong heritability, particularly in identical twins, indicating a significant genetic component. Environmental factors also influence association frequency but do not alter the basic chromosomal ratio.

    Area of Science:

    • Human genetics
    • Cytogenetics
    • Molecular biology

    Background:

    • Acrocentric chromosome association, a phenomenon involving the nucleolar organizing regions (NORs), plays a role in chromosome stability and organization.
    • Understanding the heritability of acrocentric association can provide insights into genetic and environmental influences on chromosomal behavior.

    Purpose of the Study:

    • To investigate the heritability of acrocentric association frequency in various familial relationships.
    • To differentiate between genetic and environmental contributions to acrocentric association.

    Main Methods:

    • Analysis of acrocentric association in peripheral blood lymphocytes from monozygotic twins, dizygotic twins, parent-offspring trios, and spouse pairs.
    • G-banding technique applied to lymphocyte cultures.

    Related Experiment Videos

  • Scoring of both absolute and relative acrocentric association frequencies.

    • Main Results:

    • Positive correlations in acrocentric association frequency were observed among relatives, strongest in monozygotic twins and decreasing in parent-offspring and dizygotic twins.
    • A high broad-sense heritability estimate (0.81) was calculated for relative parameters, suggesting a substantial genetic influence, possibly due to genetic dominance.
    • Spouse pairs showed a positive correlation for absolute frequency but not for relative frequency, indicating shared environmental influences on absolute association.

    Conclusions:

    • Acrocentric association frequency is significantly heritable, with genetic factors playing a major role.
    • A proposed model suggests that genotype determines the ratio of associated chromosome types, while environmental factors influence the absolute frequency without altering this ratio.