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[Pathobiochemistry of alcoholism].

J P von Wartburg

    Bulletin Der Schweizerischen Akademie Der Medizinischen Wissenschaften
    |March 1, 1979
    PubMed
    Summary

    Genetic variations in alcohol dehydrogenase (ADH) impact ethanol metabolism. The "atypical" ADH variant accelerates alcohol breakdown, increasing toxic acetaldehyde levels and adverse reactions, particularly in certain populations.

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    Area of Science:

    • Biochemistry
    • Pharmacogenetics
    • Human Genetics

    Background:

    • Liver alcohol dehydrogenase (ADH) is central to ethanol metabolism.
    • Genetic polymorphisms in ADH, including the
    • atypical
    • variant, significantly influence enzyme activity.
    • The
    • atypical
    • ADH variant exhibits higher specific activity, altering ethanol metabolic rates.

    Purpose of the Study:

    • To investigate the metabolic consequences of the
    • atypical
    • ADH variant.
    • To understand the relationship between genetic enzyme patterns and alcohol sensitivity.
    • To explore the implications of acetaldehyde toxicity in carriers of the
    • atypical
    • ADH variant.

    Main Methods:

    • Enzyme activity assays to characterize ADH variants.
    • Metabolic studies measuring ethanol and acetaldehyde levels.
    • Population genetic analysis to determine the frequency of ADH phenotypes.

    Main Results:

    • The
    • atypical
    • ADH variant leads to accelerated ethanol metabolism.
    • Carriers of the
    • atypical
    • ADH variant exhibit elevated blood acetaldehyde concentrations.
    • Acetaldehyde accumulation is associated with adverse effects like tachycardia, nausea, and flushing.
    • A higher prevalence of the
    • atypical
    • ADH variant is observed in Mongoloid populations, correlating with alcohol hypersensitivity.
    • In Caucasians, the
    • atypical
    • ADH variant is less common but may increase organotoxicity with regular alcohol intake.

    Conclusions:

    • Genetically determined ADH enzyme patterns, specifically the
    • atypical
    • variant, play a crucial role in alcohol metabolism and individual response.
    • The
    • atypical
    • ADH variant can act as an aversive factor against alcohol consumption due to induced toxicity.
    • Understanding these genetic variations is vital for predicting alcohol-related health risks and organotoxicity.

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