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[Dominant nonsense suppressors restricting the killer activity in Saccharomyces cerevisiae]

G F Nesterova, A M Zekhnov, S G Inge-Vechtomov

    Genetika
    |January 1, 1975
    PubMed

    Insights

    Dominant suppressors of nonsense mutations in Saccharomyces cerevisiae reduce or eliminate killer activity. These genetic mutations result in distinct killer phenotypes (CN and N) that are dominant over sensitive and killer phenotypes.

    Area of Science:

    • Genetics
    • Molecular Biology
    • Microbiology

    Background:

    • Saccharomyces cerevisiae, a model organism, exhibits killer activity mediated by specific genetic factors.
    • Nonsense mutations can disrupt gene function, leading to altered cellular phenotypes.
    • Genetic suppressors can restore or modify the expression of mutated genes.

    Purpose of the Study:

    • To investigate the effect of dominant suppressors of nonsense mutations on the killer activity in Saccharomyces cerevisiae.
    • To characterize the resulting killer phenotypes in the presence of these suppressors.

    Main Methods:

    • Utilized Peterhoff genetic stocks of Saccharomyces cerevisiae.
    • Introduced dominant suppressors of first-type nonsense mutations (ade1-6, hisX, lys9-A21, leu2-2) into killer strains.
    • Assessed killer activity at different temperatures (20 and 32 degrees Celsius).

    Main Results:

    • Dominant suppressors significantly inhibited the killer activity of Saccharomyces cerevisiae.
    • Specific suppressor mutations led to the emergence of novel phenotypes: CN (weak killer at 20°C, neutral at 32°C) and N (neutral at both temperatures).
    • The CN and N phenotypes demonstrated dominance over the sensitive (S) and killer (K) phenotypes.

    Conclusions:

    • Dominant suppressors of nonsense mutations play a crucial role in regulating killer activity in Saccharomyces cerevisiae.
    • These suppressors can modulate killer phenotypes, leading to temperature-dependent or neutral killer activity.
    • The study provides insights into gene regulation and phenotype expression in yeast genetics.

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