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Related Experiment Videos

Break-join recombination in phage lambda.

F W Stahl1, M S Fox, D Faulds

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

Genetics
|July 1, 1990
PubMed
Summary
This summary is machine-generated.

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Bacteriophage lambda

Area of Science:

  • Molecular Biology
  • Genetics
  • Virology

Background:

  • The Red pathway in bacteriophage lambda facilitates recombination, particularly near double-strand break sites like cos.
  • Understanding the mechanism of Red-mediated recombination is crucial for comprehending viral DNA repair and integration.
  • Previous models suggested a break-copy mechanism for Red-mediated recombination, requiring significant DNA synthesis.

Purpose of the Study:

  • To investigate the extent of DNA synthesis associated with Red-mediated recombination in bacteriophage lambda under replication-blocked conditions.
  • To determine if Red-mediated recombination proceeds via a break-copy pathway.
  • To analyze the impact of restriction enzyme-induced double-strand breaks on recombination and DNA synthesis.

Main Methods:

Related Experiment Videos

  • Induction of double-strand breaks at the cos site and other locations using restriction enzymes in replication-blocked phage lambda crosses.
  • Quantification of newly synthesized DNA associated with recombinant molecules.
  • Comparison of DNA synthesis levels in crosses initiated at cos versus those initiated by restriction enzyme cuts.

    • Main Results:

    • Recombination initiated by the cos site in replication-blocked crosses showed limited DNA synthesis near cos.
    • Restriction enzyme-induced recombination, even when occurring far from cos, also involved minimal DNA synthesis.
    • These findings were consistent even when DNA replication enzymes were present in normal amounts.

    Conclusions:

    • The study provides evidence against a break-copy model for Red-mediated recombination in bacteriophage lambda.
    • Recombination mediated by the Red pathway appears to involve limited DNA synthesis, challenging previously held mechanistic assumptions.
    • The results suggest alternative models for Red-mediated recombination that do not rely on extensive DNA synthesis.