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Mutator activity in Schizophyllum commune.

Y Shneyour, Y Koltin

    Mutation Research
    |January 1, 1983
    PubMed
    Summary

    A newly identified recessive mutator trait significantly increases spontaneous mutations and UV sensitivity. This is linked to a lack of UV-specific endonuclease activity, suggesting a role in DNA repair and mutation regulation.

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    Area of Science:

    • Microbiology
    • Molecular Biology
    • Genetics

    Background:

    • Spontaneous mutations can arise from various genetic and environmental factors.
    • DNA repair mechanisms are crucial for maintaining genomic stability.
    • Specific enzymes play key roles in DNA repair and regulating mutation rates.

    Purpose of the Study:

    • To identify and characterize a novel bacterial strain exhibiting an elevated mutation rate.
    • To investigate the genetic basis and associated phenotypes of this mutator trait.
    • To explore the role of specific enzymatic activities in the observed mutation rate.

    Main Methods:

    • Isolation and characterization of bacterial strains with high reversion rates.
    • Genetic analysis to determine the inheritance pattern of the mutator trait (recessive).
    • Assays to assess UV sensitivity and specific endonuclease activity in wild-type and mutator strains.

    Main Results:

    • A bacterial strain with a significantly elevated spontaneous mutation rate and high reversion rate at the pab- locus was identified.
    • The mutator trait was found to be recessive.
    • Mutator strains exhibited increased UV sensitivity and a lack of UV-specific endonucleolytic activity.
    • The identified endonuclease, involved in mutation rate regulation, acts on single-stranded DNA and has a molecular weight of approximately 38,000 daltons.

    Conclusions:

    • The recessive mutator trait is associated with impaired DNA repair, specifically a deficiency in UV-specific endonucleolytic activity.
    • A novel endonuclease, crucial for regulating mutation rates, has been identified and characterized.
    • This enzyme's activity on single-stranded DNA suggests a role in repairing specific types of DNA damage, thus influencing mutation frequency.

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