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Molecular and General Genetics MGG

, Volume 245, Issue 3, pp 294–300 | Cite as

Recombination between repeats in Escherichia coli by a recA-independent, proximity-sensitive mechanism

  • S. T. Lovett
  • T. J. Gluckman
  • P. J. Simon
  • V. A. SuteraJr.
  • P. T. Drapkin
Original Paper

Abstract

We have examined the influence of proximity on the efficiency of recombination between repeated DNA sequences in Escherichia coli. Our experiments have employed a plasmid-based assay to detect deletions between direct repeats of 100 bp. The rate of deletion of the juxtaposed direct repeats was reasonably high at 6 × 10−5 per cell. A comparison of recA+ and recA mutant strains showed that these deletion events are primarily the result of recA-independent recombination at these homologous sequences. Random restriction fragments of yeast or E. coli genomic DNA were used to separate the two repeats. Deletion rates decreased over two orders of magnitude with increasing separation of up to 7 kb. There was a surprisingly strong effect of even short sequence separations, with insertions of a few hundred base pairs exhibiting 10-fold reductions of deletion rates. No effect of recA on the efficiency of deletion was observed at any distance between repeats.

Keywords

Deletion recA-independent recombination Sister-strand exchange Direct repeats Escherichia coli genetic recombination 

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Copyright information

© Springer-Verlag 1994

Authors and Affiliations

  • S. T. Lovett
    • 1
  • T. J. Gluckman
    • 1
  • P. J. Simon
    • 1
  • V. A. SuteraJr.
    • 1
  • P. T. Drapkin
    • 1
  1. 1.Department of Biology and Rosenstiel Basic Medical Sciences CenterBrandeis UniversityWalthamUSA

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