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Related Experiment Videos

Annealing vs. invasion in phage lambda recombination

M M Stahl1, L Thomason, A R Poteete

  • 1Institute of Molecular Biology, University of Oregon, Eugene 97403-1229, USA.

Genetics
|February 7, 1998
PubMed
Summary
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Bacteriophage lambda's Red pathway facilitates genetic recombination. In RecA-deficient bacteria, this pathway primarily uses strand annealing for recombination, especially with non-allelic DNA ends.

Area of Science:

  • Molecular Biology
  • Genetics
  • Microbiology

Background:

  • Bacteriophage lambda utilizes the Red pathway for homologous recombination.
  • The RecA protein is a key mediator of genetic recombination in bacteria.
  • Understanding recombination mechanisms is crucial for genetic engineering and DNA repair studies.

Purpose of the Study:

  • To investigate the mechanism of lambda Red-mediated genetic recombination.
  • To compare recombination in wild-type (rec+) and RecA-deficient (recA mutant) bacteria.
  • To elucidate the role of DNA double-strand breaks in Red pathway recombination.

Main Methods:

  • Studying intracellular lambda DNA and mature progeny particles.
  • Inducing recombination via double-strand breaks at unique sites in vivo.

Related Experiment Videos

  • Analyzing recombination products in both rec+ and recA mutant bacterial strains.

    • Main Results:

    • In rec+ cells, a single double-strand break stimulated recombination, yielding short hybrid regions (suggesting strand invasion).
    • In recA mutants, two non-allelic double-strand breaks were needed for maximal recombination.
    • Recombinants in recA mutants showed extensive hybridization between the breaks, indicating strand annealing.

    Conclusions:

    • The lambda Red pathway employs different mechanisms depending on RecA presence and DNA end configuration.
    • In the absence of RecA and with non-allelic DNA ends, strand annealing is the predominant recombination mechanism for the Red pathway.
    • This study clarifies the distinct roles of RecA and the Red pathway in bacterial genetic recombination.