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Partial 9q trisomy associated with a 9,21 translocation

Y Chamla, C Bilbeissi, M Micheau

    Human Genetics
    |September 22, 1977
    PubMed
    Summary
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    A new case of partial trisomy 9q was identified in a child with two new genetic changes: a deletion on chromosome 9 and a translocation between chromosomes 9 and 21. This case offers insights into chromosome 9 abnormalities.

    Area of Science:

    • Genetics
    • Human Genetics
    • Cytogenetics

    Background:

    • Trisomy 9, specifically partial trisomy of the long arm (9q), is a rare chromosomal abnormality associated with significant developmental challenges.
    • Understanding the mechanisms behind de novo chromosomal aberrations is crucial for genetic counseling and diagnosis.

    Observation:

    • This report details a novel case of partial trisomy 9q in a pediatric patient.
    • The child presented with two distinct de novo genetic aberrations: a deletion of the long arms of chromosome 9 and a translocation involving chromosomes 9 and 21.

    Findings:

    • The observed genetic aberrations suggest a complex rearrangement event during gametogenesis or early embryogenesis.
    • A tentative cytogenetic explanation is proposed to elucidate the origin of these simultaneous de novo events.

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    Implications:

    • This case contributes to the understanding of the phenotypic spectrum and genetic basis of partial trisomy 9q.
    • Further research into such complex rearrangements can refine diagnostic approaches and improve genetic counseling for families affected by chromosomal abnormalities.