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Diagnostic/genetic studies in mental retardation.

J M Opitz

    Postgraduate Medicine
    |October 1, 1979
    PubMed
    Summary

    Genetic factors contribute to severe mental retardation in 45% of cases. Parents of all individuals with mental retardation deserve genetic counseling to understand recurrence risks.

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    Area of Science:

    • Genetics
    • Developmental Disabilities
    • Medical Research

    Background:

    • Severe mental retardation affects a significant population.
    • Understanding the etiology of mental retardation is crucial for diagnosis and management.

    Purpose of the Study:

    • To investigate the prevalence and causes of severe mental retardation in a specific cohort.
    • To assess the genetic contribution and recurrence risks in severe mental retardation.

    Main Methods:

    • Analysis of 1,231 cases of severe mental retardation at the Central Wisconsin Center.
    • Exclusion of environmental, psychotic, and unclassified categories.

    Main Results:

    • 45% of severe mental retardation cases were estimated to be genetically caused or predisposed.
    • High risk of recurrence was identified in only 15% of cases.

    Conclusions:

    • Genetic factors play a substantial role in severe mental retardation.
    • Etiologic and diagnostic counseling is essential for parents of all individuals with mental retardation, regardless of recurrence risk.

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