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Related Experiment Videos

Single-strand DNA intermediates in phage lambda's Red recombination pathway

S A Hill1, M M Stahl, F W Stahl

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

Proceedings of the National Academy of Sciences of the United States of America
|April 1, 1997
PubMed
Summary

Researchers developed an assay to study lambda Red recombination. The study identified long single-strand DNA intermediates with 3' polarity, confirming their role in the Red recombination pathway.

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Area of Science:

  • Molecular Biology
  • Genetics
  • DNA Replication

Background:

  • The lambda Red recombination system is a key pathway for DNA repair and genetic manipulation in bacteriophages.
  • Understanding the early intermediates of this pathway is crucial for elucidating its mechanism.
  • Previous studies relied on genetic and in vitro biochemical analyses, necessitating in vivo validation.

Purpose of the Study:

  • To develop and apply an assay for characterizing early intermediates in lambda's Red recombination pathway.
  • To physically analyze DNA structures generated during in vivo Red recombination.
  • To investigate the role of specific gene products, like the red alpha gene, in intermediate formation.

Main Methods:

  • Development of a novel assay to detect recombination intermediates.

Related Experiment Videos

  • In vivo delivery of double-strand breaks to nonreplicating lambda chromosomes.
  • Analysis of total DNA extracts using blot hybridization techniques.

    • Main Results:

    • Identification of long (>1.4 kilobases) single-strand DNA (ssDNA) intermediates.
    • Demonstration of bidirectional resection from the double-strand break site.
    • Characterization of 3' single-strand overhangs.
    • Evidence for the red alpha gene product's essential role in ssDNA production, particularly in the absence of ninR functions.

    Conclusions:

    • The observed ssDNA intermediates possess physical characteristics consistent with early recombination intermediates in the lambda Red pathway.
    • These findings provide in vivo physical evidence supporting previously proposed models of Red recombination.
    • The study highlights the importance of the red alpha gene product in initiating the processing of DNA breaks during recombination.