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Related Experiment Videos

Partial 11q trisomy syndrome

H Pihko, E Therman, I A Uchida

    Human Genetics
    |January 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Partial trisomy 11q syndrome, characterized by intellectual disability and specific facial features, is linked to duplications in the 11q23.2 region. This highlights the importance of gene-rich dark regions in genetic disorders.

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    Area of Science:

    • Genetics
    • Medical Genetics
    • Human Genetics

    Background:

    • Partial trisomy 11q is a chromosomal disorder resulting from an extra copy of a segment of the 11th chromosome's long arm.
    • This condition is often associated with balanced translocation carriers within families.

    Observation:

    • A review of 21 cases, including one stillbirth, identified key clinical features of partial trisomy 11q.
    • Characteristic symptoms include intellectual disability, short nose, long philtrum, micrognathia, retracted lower lip, and micropenis in males.

    Findings:

    • The breakpoints on 11q varied, ranging from 11q121 to 11q232.
    • No clear correlation was found between the size of the trisomic segment and symptom severity.
    • Symptoms are likely caused by trisomy for the 11q23.2 dark region, suggesting high gene density in these areas.

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    Implications:

    • These findings suggest that specific gene-rich regions, particularly the dark segments of chromosomes, play a crucial role in phenotypic expression.
    • Understanding the gene density of chromosomal regions can help predict the impact of partial trisomies.