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Related Experiment Videos

Familial Down's syndrome.

J Chemke, B Goldman

    Journal De Genetique Humaine
    |October 1, 1977
    PubMed
    Summary
    This summary is machine-generated.

    This study reports a family with two children affected by trisomy 21 (Down syndrome). It suggests an increased risk of recurrence for Down syndrome, possibly due to genetic factors influencing non-disjunction.

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    Area of Science:

    • Genetics
    • Reproductive Medicine
    • Human Cytogenetics

    Background:

    • Down syndrome, characterized by trisomy 21, is a common genetic disorder.
    • Recurrence risk for chromosomal abnormalities is a significant concern in reproductive genetics.
    • Maternal age is a known risk factor, but familial predispositions are also investigated.

    Observation:

    • A family presented with two offspring diagnosed with trisomy 21.
    • The second affected pregnancy was terminated following diagnostic amniocentesis.
    • Maternal chromosomal analysis revealed no abnormalities, ruling out simple parental translocations.

    Findings:

    • The case, along with previous reports, indicates an elevated risk of trisomy 21 recurrence within families.
    • This increased risk may be attributed to a genetic predisposition for non-disjunction events.

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  • Non-disjunction is the failure of chromosomes to separate properly during cell division.

    • Implications:

    • Genetic counseling should consider the possibility of familial tendencies for non-disjunction in Down syndrome.
    • Amniocentesis and fetal karyotyping are recommended for all subsequent pregnancies after a trisomy 21 diagnosis, regardless of maternal age.
    • Further research into the genetic factors influencing non-disjunction could improve risk assessment for chromosomal disorders.