The rex gene of bacteriophage lambda is really two genes

Area of Science:

• Molecular biology
• Genetics
• Virology

Background:

• Bacteriophage lambda is a model organism for studying gene regulation.
• The rex genes play a role in bacteriophage lambda's life cycle and host interactions.
• Understanding the genetic basis of rex mutants is crucial for deciphering lambda's regulatory networks.

Purpose of the Study:

• To genetically characterize previously isolated rex- mutants of bacteriophage lambda.
• To determine the complementation groups within the rex- mutant collection.
• To elucidate the regulatory mechanisms governing rex gene expression.

Main Methods:

• Complementation tests were performed between different rex- mutants.
• Interactions between rex mutants and prm- mutants were analyzed.
• Gene expression patterns were inferred based on complementation data.

Main Results:

• Complementation tests revealed two distinct complementation groups: rexA and rexB.
• rexA- mutants failed to complement prm- mutants, indicating a link to the repressor gene.
• rexB- mutants complemented prm- mutants, suggesting independent regulation.

Conclusions:

• The rex gene locus in bacteriophage lambda comprises at least two genes, rexA and rexB.
• rexA appears to be under the control of the PRM promoter, coordinately regulated with the cI (repressor) gene.
• rexB is likely regulated by a separate promoter, distinct from the PRM promoter.