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Deletion mapping of the lambda REX gene.

G N Gussin, V Peterson, N Loeb

    Genetics
    |July 1, 1973
    PubMed
    Summary
    This summary is machine-generated.

    Researchers ordered 12 lambda rex(-) mutants using deletion mapping. The rex209 mutation is positioned approximately 260-300 nucleotide pairs from the sex1 mutation on the lambda phage genome.

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    Area of Science:

    • Molecular biology
    • Genetics
    • Virology

    Background:

    • Bacteriophage lambda is a critical model organism for studying gene regulation and DNA replication.
    • Lambda rex(-) mutants exhibit altered host range and exclusion properties, indicating mutations within the rex region.
    • Understanding the precise genetic organization of the rex region is essential for deciphering its functional mechanisms.

    Purpose of the Study:

    • To establish a high-resolution genetic map of the lambda rex(-) region.
    • To order 12 independently isolated lambda rex(-) mutants.
    • To correlate genetic mapping data with physical DNA landmarks.

    Main Methods:

    • Deletion mapping was employed to analyze recombination frequencies between lambda rex(-) mutants.
    • Recombination data was integrated with previously determined physical deletion endpoint positions.

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  • Nucleotide pair distances were estimated based on the correlation of genetic and physical mapping.

    • Main Results:

    • Twelve lambda rex(-) mutants were successfully ordered using deletion mapping techniques.
    • The left-most mutation, rex209, was localized relative to known genetic markers and physical endpoints.
    • The rex209 mutation is estimated to be 260-300 nucleotide pairs from the sex1 mutation and 475 nucleotide pairs from the lambdaimm434 nonhomology region.

    Conclusions:

    • Deletion mapping provides a robust method for ordering mutations within the lambda rex region.
    • The physical location of the rex209 mutation was determined with respect to established lambda genome landmarks.
    • This ordered map refines our understanding of the lambda rex locus organization.