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Cd bands and centromeric function in dicentric chromosomes

P Maraschio, O Zuffardi, F Lo Curto

    Human Genetics
    |January 1, 1980
    PubMed
    Summary
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    The Cd technique distinguishes active from inactive centromeres. This study shows centromere inactivation is chromosome-specific, not cell-wide, in dicentric chromosomes.

    Area of Science:

    • Cytogenetics
    • Molecular Biology
    • Cancer Research

    Background:

    • Dicentric chromosomes, possessing two centromeres, pose unique challenges in cell division.
    • Understanding centromere function and inactivation is crucial for comprehending chromosomal stability and disease development.

    Observation:

    • The chromomycin A3 (Cd) technique was employed to analyze dicentric attached X chromosomes (XpXp and XqXq) and a tumor-derived cell line (MaNo9).
    • Cells exhibited both dicentric chromosomes with two active centromeres and those with one active and one inactive centromere.

    Findings:

    • The Cd technique effectively differentiates between active and latent centromeres.
    • True dicentric chromosomes and those with a single latent centromere were observed co-existing within the same cells.

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    Implications:

    • Centromere inactivation is a chromosome-specific event, not a generalized phenomenon affecting the entire cell.
    • This finding advances our understanding of the mechanisms governing centromere regulation and chromosomal stability.