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Familial hyperalphalipoproteinemia.

C J Glueck, R W Fallat, F Millett

    Archives of Internal Medicine
    |August 1, 1975
    PubMed
    Summary
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    Familial hyperalphalipoproteinemia, a genetic condition, elevates high-density lipoprotein cholesterol. This study identifies it as an autosomal dominant trait, distinct from secondary causes.

    Area of Science:

    • Genetics
    • Cardiovascular Disease
    • Lipid Metabolism

    Background:

    • Familial hyperalphalipoproteinemia is a rare genetic disorder.
    • Elevated high-density lipoprotein cholesterol (HDL-C) is associated with cardiovascular health.
    • Understanding the inheritance patterns of lipid disorders is crucial for genetic counseling and disease management.

    Purpose of the Study:

    • To characterize the inheritance pattern of a newly recognized form of heritable hyperlipoproteinemia.
    • To investigate whether the observed hyperalphalipoproteinemia is secondary to known factors.
    • To determine the clinical phenotype associated with this genetic lipid disorder.

    Main Methods:

    • Pedigree analysis of a 26-member kindred over three generations.
    • Segregation analysis of hyperalphalipoproteinemia in matings between affected and unaffected individuals.

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  • Biochemical analysis of plasma lipid profiles, including total cholesterol, low-density lipoprotein cholesterol, triglyceride, and HDL-C levels.

    • Main Results:

    • Hyperalphalipoproteinemia was observed in affected family members and transmitted vertically.
    • The inheritance pattern was consistent with an autosomal dominant trait (12:13 ratio of affected to unaffected offspring, p > 0.05).
    • Affected individuals exhibited consistently elevated HDL-C levels with normal total cholesterol, low-density lipoprotein cholesterol, and triglyceride levels, and were clinically healthy.

    Conclusions:

    • Familial hyperalphalipoproteinemia is a distinct genetic disorder characterized by autosomal dominant inheritance.
    • This condition leads to elevated HDL-C without adverse clinical manifestations or secondary causes.
    • Further research into the genetic basis and clinical implications of familial hyperalphalipoproteinemia is warranted.