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Related Experiment Videos

Mutagenesis and cellular responses to DNA damage.

G C Walker, C J Kenyon, A Bagg

    National Cancer Institute Monograph
    |January 1, 1982
    PubMed
    Summary

    DNA-damaging agents induce damage-inducible (din) genes in Escherichia coli, including uvrA, uvrB, and umuC. The lexA protein represses these genes, and its cleavage is essential for induction, with plasmid pKM101 potentially carrying a umuC analog.

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    Area of Science:

    • Molecular Biology
    • Microbiology
    • Genetics

    Background:

    • DNA-damaging agents trigger the expression of damage-inducible (din) genes in Escherichia coli.
    • Understanding the regulation and function of these din genes is crucial for comprehending DNA repair and mutagenesis pathways.

    Purpose of the Study:

    • To investigate the regulation and function of din genes in Escherichia coli using genetic techniques.
    • To elucidate the role of the lexA gene in repressing din gene expression.
    • To determine the mechanism by which plasmid pKM101 influences chemical mutagenesis.

    Main Methods:

    • Utilized Mud(Ap, lac) bacteriophage to create fusions between beta-galactosidase and din gene promoters.
    • Performed genetic analyses of din-lac fusions to identify regulatory elements.
    • Employed insertion mutagenesis with Tn5 to map the region on plasmid pKM101 responsible for mutagenesis effects.

    Main Results:

    • Demonstrated that uvrA, uvrB, and umuC genes are induced by DNA damaging agents.
    • Established that lexA is the direct repressor of din genes and its proteolytic cleavage is required for induction.
    • Provided evidence that plasmid pKM101 may contain a umuC gene analog, contributing to increased mutagenesis.

    Conclusions:

    • The lexA protein directly represses din genes, and its cleavage mediates their induction in response to DNA damage.
    • The uvrA and uvrB gene products are involved in DNA repair, while umuC is essential for mutagenesis.
    • Plasmid pKM101 enhances mutagenesis, likely by providing a functional analog of the umuC gene.

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