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Related Experiment Videos

Trisomy 4p: five new observations and overview.

B Dallapiccola, P P Mastroiacovo, E Montali

    Clinical Genetics
    |December 1, 1977
    PubMed
    Summary
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    Trisomy 4p, a distinct genetic disorder, is characterized by prenatal growth delays, severe intellectual disability, and distinctive facial features. This condition arises from specific chromosomal abnormalities in parents, impacting offspring development.

    Area of Science:

    • Genetics
    • Clinical Medicine
    • Human Chromosome Abnormalities

    Background:

    • Chromosome 4p trisomy, a rare genetic disorder, presents significant challenges in diagnosis and understanding.
    • Identifying the parental origins of 4p trisomy is crucial for genetic counseling and recurrence risk assessment.

    Observation:

    • Presents five new cases of trisomy of the short arm of chromosome 4 (4p trisomy).
    • Investigates two distinct parental chromosomal abnormalities leading to 4p trisomy: maternal centric fission of chromosome 4 and maternal balanced translocations (3p/4q or 4/22).

    Findings:

    • Establishes 4p trisomy as a defined clinical entity based on aggregated data.
    • Key clinical features include prenatal onset growth retardation, severe mental deficiency, microcephaly, and characteristic facial dysmorphisms.

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  • Dermatoglyphic patterns and radiological findings are noted as potential diagnostic aids.

    • Implications:

    • Enhances the understanding of the genetic basis and clinical spectrum of 4p trisomy.
    • Highlights the importance of parental chromosomal analysis in diagnosing and managing 4p trisomy.
    • Provides a foundation for further research into the specific mechanisms and long-term outcomes of this syndrome.