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Early- and late-onset bipolar illness

M A Taylor, R Abrams

    Archives of General Psychiatry
    |January 1, 1981
    PubMed
    Summary

    Early-onset bipolar disorder shows higher familial risk for affective disorders and alcoholism. This suggests a stronger genetic influence, with earlier onset potentially indicating a more severe genotype expressed sooner.

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    Area of Science:

    • Psychiatry
    • Genetics
    • Neuroscience

    Background:

    • Bipolar disorder is a complex mental health condition with a significant genetic component.
    • Understanding the influence of illness onset age on genetic factors is crucial for diagnosis and treatment.

    Purpose of the Study:

    • To investigate the relationship between age of onset in bipolar disorder and familial morbidity risk.
    • To explore clinical and genetic differences between early- and late-onset bipolar probands.

    Main Methods:

    • Categorization of 134 bipolar probands into early- (onset < 30 years) and late-onset groups.
    • Comparison of morbidity risk for affective disorders and alcoholism in first-degree relatives.
    • Assessment of neuropsychological function and clinical course characteristics.

    Main Results:

    • Early-onset probands exhibited three times the morbidity risk for affective disorders in relatives compared to late-onset probands.
    • Early-onset group showed a higher proportion of relatives with bipolar disorder and greater neuropsychological dysfunction.
    • Increased morbidity risk for alcoholism was observed in first-degree relatives of early-onset patients.

    Conclusions:

    • Age at illness onset is a significant factor in understanding the genetic basis of bipolar disorder.
    • Findings support a polygenic or multifactorial model where earlier onset may correlate with a more severe genotype.
    • Earlier onset is associated with increased familial risk and distinct clinical features, highlighting its importance in genetic studies.

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