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Down's syndrome. I. Cytogenetics.

C Maximilian, D Duca, T Pop

    Endocrinologie
    |October 1, 1980
    PubMed
    Summary
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    This study investigated 107 children with Down syndrome, finding free trisomy in most cases. Cytogenetic analysis and maternal age monitoring are recommended for Down syndrome prophylaxis.

    Area of Science:

    • Genetics
    • Pediatrics
    • Medical Diagnostics

    Background:

    • Down syndrome is a genetic disorder characterized by the presence of all or part of a third copy of chromosome 21.
    • Accurate cytogenetic diagnosis is crucial for understanding the specific genetic cause and recurrence risks.

    Purpose of the Study:

    • To cytogenetically characterize a cohort of children diagnosed with Down syndrome.
    • To identify the prevalence of different chromosomal abnormalities leading to Down syndrome.
    • To inform strategies for the prophylaxis and genetic counseling of Down syndrome.

    Main Methods:

    • Clinical diagnosis of Down syndrome in 107 children.
    • Cytogenetic investigation of 80% of the children's parents.
    • Karyotyping to identify specific chromosomal abnormalities, including trisomy and translocations.

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    Main Results:

    • Free trisomy 21 was observed in 82.2% of cases.
    • Translocation Down syndrome was identified in 14.7% of cases, including 14/21 and 21/21 translocations.
    • Other rare chromosomal abnormalities were noted in a small percentage of individuals.

    Conclusions:

    • Cytogenetic investigation of children with suspected Down syndrome and their parents is essential for accurate diagnosis and risk assessment.
    • Genetic counseling and family studies are recommended for cases involving translocations.
    • Monitoring pregnancies in mothers over 35 is a key preventive measure for Down syndrome.