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Specific mismatch correction in bacteriophage lambda crosses by very short patch repair.

M Lieb

    Molecular & General Genetics : MGG
    |January 1, 1983
    PubMed
    Summary

    The am6 mutation in bacteriophage lambda

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    Area of Science:

    • Molecular Biology
    • Genetics
    • Microbiology

    Background:

    • Bacteriophage lambda's cI gene encodes the repressor protein.
    • Genetic recombination and DNA repair mechanisms are crucial for bacteriophage lambda's life cycle.
    • The am6 mutation exhibits unusual recombination frequencies in the cI gene.

    Purpose of the Study:

    • To investigate the anomalous recombination patterns of the am6 mutation in the bacteriophage lambda cI gene.
    • To explore the role of DNA mismatch repair and branch migration in the observed recombination frequencies.
    • To understand the influence of DNA methylation on mutation susceptibility and repair.

    Main Methods:

    • Utilizing four-factor genetic crosses with bacteriophage lambda strains carrying the am6 mutation and other cI mutations.
    • Analyzing the frequency of cI+ recombinants, including those requiring multiple crossovers (triple recombinants).
    • Comparing recombination outcomes with different types of mutations, including large insertions and adjacent mutations.

    Main Results:

    • The am6 mutation recombines more frequently than expected based on physical distances.
    • Triple recombinants are unexpectedly frequent when crossing am6 with nearby mutations.
    • Large insertions significantly reduce triple recombinant frequency, suggesting interference with heteroduplex formation.
    • Recombinants often retain flanking markers of the am6 parent, indicating localized repair.
    • Repair tracts associated with am6 mismatches appear to be short, approximately 20 bp.

    Conclusions:

    • The am6 mutation is highly susceptible to mismatch repair in heteroduplexes within the cI gene.
    • Branch migration likely generates heteroduplexes that are subsequently repaired.
    • The location of am6 within a methylated CCAGG sequence may predispose it to specific repair pathways like very short patch (VSP) repair.

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