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Related Experiment Videos

Type II syndactyly or synpolydactyly.

P Merlob, M Grunebaum

    Journal of Medical Genetics
    |June 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    A new family with syndactyly type II (synpolydactyly) was identified, exhibiting autosomal dominant inheritance with incomplete penetrance. This genetic condition affects multiple generations, often with non-manifesting carriers.

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    Area of Science:

    • Genetics
    • Orthopedics
    • Medical Genetics

    Background:

    • Syndactyly type II, also known as synpolydactyly, is a congenital limb malformation.
    • Understanding its genetic basis and inheritance patterns is crucial for genetic counseling and diagnosis.

    Observation:

    • A novel family exhibiting syndactyly type II across six generations and 16 affected individuals was documented.
    • The primary manifestation was fused digits (syndactyly) and extra digits (polydactyly), with no major systemic abnormalities observed.

    Findings:

    • The family pedigree strongly supports an autosomal dominant inheritance pattern for synpolydactyly.
    • Incomplete penetrance was noted, leading to a significant number of non-manifesting heterozygotes and apparent 'skipped generations'.

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    Implications:

    • This study highlights the variable expressivity of synpolydactyly type II, including potential minor anomalies.
    • The findings underscore the importance of considering incomplete penetrance in autosomal dominant disorders for accurate genetic assessment.