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[Mutagenic action of alkylating agents on prophage lambda].

S E Bresler, V L Kalinin, L V Kuznetsova

    Genetika
    |June 1, 1984
    PubMed
    Summary

    N-nitroso-N-methylurea (NMU) and other alkylating agents induce mutations via replication errors or repair mechanisms. NMU efficiently causes mutations independent of DNA repair pathways, suggesting replication errors are key.

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    Area of Science:

    • Molecular biology
    • Genetics
    • Chemical mutagenesis

    Context:

    • Investigating the mutagenic and lethal effects of various chemical agents on bacterial DNA.
    • Utilizing the heat-inducible lambda cI857 prophage system in E. coli to study DNA damage and repair.
    • Examining the role of DNA repair mechanisms in the mutagenic action of chemical agents.

    Purpose:

    • To determine the mechanisms by which 7 alkylating agents and cyanate induce mutations in heat-inducible lambda prophage.
    • To differentiate between replication error-based and repair-dependent mutagenesis.
    • To assess the mutagenic potential of N-nitroso-N-methylurea (NMU), N-methyl-N'-nitro-N-nitrosoguanidine (MNNG), methyl methanesulfonate (MMS), ethyl methanesulfonate (EMS), nitrogen mustard (HN2), mitomycin C (MC), bifunctional acridine mustard (AM), and cyanate (KNCO).

    Summary:

    • N-nitroso-N-methylurea (NMU) induces mutations efficiently through replication errors, independent of host repair genes (recA, lexA, uvrA, etc.).
    • N-methyl-N'-nitro-N-nitrosoguanidine (MNNG) and ethyl methanesulfonate (EMS) also primarily act via replication mechanisms.
    • Methyl methanesulfonate (MMS) is a repair-dependent mutagen, as its action is suppressed in recA mutants. Nitrogen mustard (HN2) inactivates prophage but does not induce mutations. Mitomycin C (MC) and bifunctional acridine mustard (AM) are inefficient mutagens, likely acting through intercalation.

    Impact:

    • Provides insights into the distinct mutagenic mechanisms of various chemical agents at the molecular level.
    • Highlights the critical role of DNA replication fidelity in mutagenesis.
    • Demonstrates the differential susceptibility of DNA repair pathways to specific chemical mutagens, aiding in risk assessment and understanding genotoxicity.

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