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Dandy-Walker malformation: etiologic heterogeneity and empiric recurrence risks.

J C Murray, J A Johnson, T D Bird

    Clinical Genetics
    |October 1, 1985
    PubMed
    Summary
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    Dandy-Walker malformation (DWM) has diverse genetic causes. Recurrence risk varies, being higher with specific genetic disorders and lower for sporadic cases, aiding genetic counseling.

    Area of Science:

    • Medical Genetics
    • Developmental Biology
    • Neurology

    Background:

    • Dandy-Walker malformation (DWM) is a congenital brain defect.
    • Its genetic basis and recurrence risks are not fully understood.
    • DWM involves hydrocephalus, cerebellar vermis hypoplasia, and posterior fossa cysts.

    Purpose of the Study:

    • To investigate the genetic heterogeneity and recurrence risks of Dandy-Walker malformation.
    • To provide updated guidelines for genetic counseling in families affected by DWM.

    Main Methods:

    • Retrospective analysis of 21 autopsy-proven DWM cases.
    • Comprehensive literature review of 92 additional DWM subjects.
    • Evaluation of genetic and environmental etiologies.

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    Main Results:

    • DWM exhibits significant genetic and etiological heterogeneity.
    • Recurrence risk is elevated when DWM is part of a Mendelian disorder (e.g., Warburg syndrome).
    • Sporadic DWM cases have a low recurrence risk (1-5%).
    • Associated anomalies include congenital heart disease, cleft lip/palate, and neural tube defects.

    Conclusions:

    • DWM etiology is diverse, ranging from single-gene defects to chromosomal anomalies and environmental factors.
    • Accurate genetic counseling requires differentiating DWM subtypes.
    • Understanding recurrence risks is crucial for affected families.