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[Gene RAD31 is identical to gene MEC1 of yeast Saccharomyces cerevisiae]

T N Kozhina, S A Kozhin, V G Korolev

    Genetika
    |July 27, 2011
    PubMed

    Insights

    The RAD31 gene, now designated mec1-212, is an allele of MEC1. This mutation impacts DNA repair and replication error correction, increasing spontaneous mutations.

    Area of Science:

    • Genetics
    • Molecular Biology
    • Cell Cycle Regulation

    Background:

    • The gene RAD31 was previously identified and mapped.
    • Its localization was found to be on the right arm of chromosome II, near the MEC1 gene.

    Purpose of the Study:

    • To investigate the genetic relationship between RAD31 and MEC1.
    • To characterize the functional consequences of the rad31 mutation.

    Main Methods:

    • Epistatic analysis was performed to determine the allelic relationship.
    • Phenotypic analysis of the rad31 mutation (mec1-212) was conducted, including sensitivity to hydroxyurea, checkpoint function, UV-induced mutagenesis, and spontaneous canavanine-resistance mutations.

    Main Results:

    • Epistatic analysis confirmed that the rad31 mutation is an allele of MEC1, designated mec1-212.
    • mec1-212 exhibits sensitivity to hydroxyurea, impaired checkpoint function, and suppression of UV-induced mutagenesis, consistent with other MEC1 deletion alleles.
    • Notably, mec1-212 significantly elevates spontaneous canavanine-resistance mutations, indicating a distinct role in DNA replication and repair error correction.

    Conclusions:

    • The rad31 mutation (mec1-212) represents a novel allele of the MEC1 gene.
    • This mutation highlights a unique role for MEC1 in preventing spontaneous mutations arising from replication and repair errors, differentiating it from previously characterized alleles.

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