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Related Experiment Videos

Partial trisomy 20 confirmed by gene dosage studies.

N L Rudd, H W Bain, E Giblett

    American Journal of Medical Genetics
    |January 1, 1979
    PubMed
    Summary

    A rare genetic disorder, partial trisomy 20p syndrome, is presented in a female infant with multiple congenital anomalies. Genetic analysis confirmed an extra chromosome 20 with a deleted long arm, supporting the diagnosis.

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    Area of Science:

    • Genetics
    • Clinical Medicine
    • Developmental Biology

    Background:

    • Partial trisomy 20p syndrome is a rare chromosomal disorder.
    • It is characterized by a range of developmental abnormalities.
    • Accurate diagnosis is crucial for understanding prognosis and management.

    Observation:

    • A female infant presented with multiple congenital anomalies.
    • Symptoms included pre- and postnatal growth failure, microcephaly, distinctive facial features, and minor skeletal anomalies.
    • The infant had an extra small metacentric chromosome despite normal parental karyotypes.

    Findings:

    • Cytogenetic analysis revealed the extra chromosome was a derivative of chromosome 20.
    • Specifically, it involved a deletion of the distal portion of the long arm (20p).

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  • Gene dose studies for adenosine deaminase (ADA) and inosine triphosphatase (ITP) corroborated the cytogenetic findings.

    • Implications:

    • This case highlights the importance of detailed cytogenetic analysis in diagnosing complex genetic syndromes.
    • The findings contribute to the understanding of genotype-phenotype correlations in partial trisomy 20p.
    • Further research can refine diagnostic criteria and therapeutic strategies for affected individuals.