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Related Experiment Videos

Selection acting upon slow-migrating ADH alleles differing in enzyme activity.

J N Thompson, T N Kaiser

    Heredity
    |April 1, 1977
    PubMed
    Summary

    This study shows alcohol dehydrogenase enzyme activity directly impacts fruit fly survival in alcohol environments. Higher enzyme activity in Drosophila melanogaster correlates with increased viability, supporting its role in adaptation.

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    Area of Science:

    • * Genetics and Molecular Biology
    • * Enzymology
    • * Evolutionary Biology

    Background:

    • * Drosophila melanogaster possesses genetic variation in alcohol dehydrogenase (ADH) enzyme activity.
    • * Previous studies suggested a selective advantage for high ADH activity alleles in alcohol-exposed environments.
    • * The precise mechanism behind this selective advantage remained unclear.

    Purpose of the Study:

    • * To investigate the direct relationship between alcohol dehydrogenase (ADH) enzyme activity and survival rates in Drosophila melanogaster.
    • * To determine if enzyme activity itself, or other allelic factors, confers a survival advantage.
    • * To test the hypothesis that ADH enzyme function is the primary driver of adaptation to alcohol media.

    Main Methods:

    • * Comparison of relative egg-to-adult viability across three Drosophila melanogaster stocks with differing ADH activities.
    • * Utilized Grell's standard ADHS and a mutant ADHS strain with reduced ADH molecule production but identical electrophoretic mobility.
    • * Assessed survival rates in alcohol-supplemented media.

    Main Results:

    • * A clear correlation was observed between ADH enzyme activity levels and survival rates in alcohol-supplemented media.
    • * Stocks with higher ADH activity exhibited significantly greater viability.
    • * The results were consistent across different genetic backgrounds with similar electrophoretic properties.

    Conclusions:

    • * Enzyme activity per se is strongly implicated as the factor responsible for the selective advantage of high-activity ADH alleles.
    • * The findings support the hypothesis that functional enzyme capacity, not merely allelic differences, drives adaptation to alcohol.
    • * This research clarifies the molecular basis of adaptation in Drosophila melanogaster to environmental alcohol exposure.

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