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Regulation of repressor expression in lambda.

H Eisen, P Brachet, L Pereira da Silva

    Proceedings of the National Academy of Sciences of the United States of America
    |July 1, 1970
    PubMed
    Summary
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    Researchers identified a new gene, cro, in bacteriophage lambda. This gene controls viral gene expression and prevents immunity, with cro(-) mutants being isolated and studied.

    Area of Science:

    • Molecular Biology
    • Genetics
    • Virology

    Background:

    • Bacteriophage lambda is a well-studied virus with a complex regulatory system governing its life cycle.
    • Gene expression in bacteriophages is tightly controlled to ensure efficient replication and host interaction.

    Purpose of the Study:

    • To describe a newly identified gene in bacteriophage lambda.
    • To elucidate the function of the cro gene product in regulating viral gene expression and immunity.

    Main Methods:

    • Isolation and characterization of bacteriophage lambda mutants with defects in the cro gene (cro(-)).
    • Analysis of gene expression patterns in wild-type and cro(-) mutant bacteriophages.

    Main Results:

    • A novel gene, designated cro, was identified in bacteriophage lambda.

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  • The cro gene product was found to inhibit the expression of immunity.
  • The cro gene product regulates the expression of genes located to the left of the immunity region.

    • Conclusions:

    • The cro gene plays a crucial role in the regulatory network of bacteriophage lambda.
    • Understanding the cro gene's function provides insights into viral gene control mechanisms.