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Related Experiment Videos

DNA rearrangement mediated by inverted repeats

X Bi1, L F Liu

  • 1Department of Molecular Biology, Princeton University, NJ 08544, USA.

Proceedings of the National Academy of Sciences of the United States of America
|January 23, 1996
PubMed
Summary

Inverted repeats in DNA can cause genome rearrangement. This study reveals they form head-to-head dimers, not simple inversions, via a novel recA-independent mechanism during DNA replication.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Genomics

Background:

  • Inverted repeats are common DNA sequences in prokaryotes and eukaryotes.
  • These sequences are known to mediate genome rearrangements.

Purpose of the Study:

  • To investigate the mechanism of genome rearrangement mediated by plasmid-borne inverted repeats in Escherichia coli.
  • To elucidate the nature of recombination products and the underlying molecular process.

Main Methods:

  • Experiments were conducted in Escherichia coli using plasmid-borne inverted repeats.
  • Recombination events and their products were analyzed.
  • The effect of distance between repeats on recombination frequency was assessed.

Main Results:

  • Inverted repeats mediate an efficient, recA-independent recombination event.
  • The primary product is an unusual head-to-head dimer with complex DNA rearrangement, not simple inversion.
  • Recombination is reduced when the distance between repeats increases.

Conclusions:

  • A model involving reciprocal strand switching during DNA replication within inverted repeats explains the observed recombination.
  • This switching leads to Holliday junction formation and the unusual dimer product.
  • Reciprocal strand switching during replication may be a general mechanism for genome rearrangement associated with inverted duplications.

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