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cis-Dominant mutations which dramatically enhance DUR1,2 gene expression without affecting its normal regulation.

G Chisholm, T Cooper

    Molecular and Cellular Biology
    |May 1, 1984
    PubMed
    Summary

    Researchers identified three mutations in Saccharomyces cerevisiae that significantly boost DUR1,2 gene expression. These mutations increase gene product levels without disrupting normal gene regulation or affecting nearby genes.

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    Area of Science:

    • Molecular Biology
    • Yeast Genetics

    Background:

    • The DUR1,2 gene in Saccharomyces cerevisiae is crucial for nutrient utilization and its expression is tightly regulated.
    • Understanding gene regulation mechanisms is fundamental in molecular biology.

    Purpose of the Study:

    • To isolate and characterize cis-dominant mutations that enhance DUR1,2 gene expression in yeast.
    • To investigate the nature of these mutations and their impact on gene regulation.

    Main Methods:

    • Isolation of cis-dominant mutations in Saccharomyces cerevisiae.
    • Analysis of DUR1,2 gene expression levels in haploid and diploid strains.
    • Assessment of gene inducibility and sensitivity to nitrogen catabolite repression.
    • RNA analysis to quantify DUR1,2-specific RNA levels.

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  • Evaluation of effects on neighboring genes.

    • Main Results:

    • Three cis-dominant mutations were identified that significantly enhance DUR1,2 gene expression.
    • The enhanced expression was observed under both uninduced and induced conditions, indicating a superimposed overproduction trait.
    • Normal gene inducibility and sensitivity to nitrogen catabolite repression were maintained.
    • The mutations appeared specific to DUR1,2 gene expression and did not affect adjacent genes.
    • Mutations may alter chromatin structure near DUR1,2 regulatory sequences or involve non-ROAM Ty insertions.

    Conclusions:

    • The identified mutations provide novel tools for studying gene expression regulation in yeast.
    • These mutations offer insights into mechanisms controlling DUR1,2 gene expression, potentially involving chromatin modification or specific transposon activity.