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Related Concept Videos

Overview of Transposition and Recombination02:13

Overview of Transposition and Recombination

Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in speciation by changing genome sizes and modifying gene expression patterns. For example, in bacteria, transposition can lead to conferring antibiotic resistance. Movement of transposable elements within the genetic pool of pathogenic bacteria can aid in transfer of antibiotic-resistant genetic elements. In eukaryotes, transposons can carry out...
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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Related Experiment Video

Updated: May 21, 2026

Site-specific Bacterial Chromosome Engineering: ΦC31 Integrase Mediated Cassette Exchange (IMCE)
08:21

Site-specific Bacterial Chromosome Engineering: ΦC31 Integrase Mediated Cassette Exchange (IMCE)

Published on: March 16, 2012

Replicative resolution of integron cassette insertion.

Céline Loot1, Magaly Ducos-Galand, José Antonio Escudero

  • 1Institut Pasteur, Unité Plasticité du Génome Bactérien, CNRS UMR3525, Paris 75724, France.

Nucleic Acids Research
|June 29, 2012
PubMed
Summary
This summary is machine-generated.

Integron recombination involves single-stranded attC sites. This study shows a replicative resolution mechanism, not a second strand exchange, resolves the Holliday junction during gene cassette insertion.

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Last Updated: May 21, 2026

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Site-specific recombination is crucial in DNA manipulation.
  • Tyrosine recombinases typically involve two strand exchanges forming a Holliday junction (HJ).
  • Integrons utilize attC sites as single-stranded substrates for gene cassette insertion.

Purpose of the Study:

  • To elucidate the mechanism of Holliday junction resolution in integron recombination.
  • To investigate the fate of attC site strands during recombination.
  • To determine if a second strand exchange or replication resolves the HJ.

Main Methods:

  • Utilized a plasmid-based attC site with specifically tagged strands.
  • Tracked the fate of each attC strand after recombination.
  • Analyzed recombination products to identify strand exchange and synthesis.

Main Results:

  • Demonstrated that only one strand of the attC site (bottom strand) undergoes exchange.
  • Showed that recombination products contain the exchanged bottom strand and a newly synthesized complementary strand.
  • Ruled out a second strand exchange mechanism for HJ resolution.

Conclusions:

  • Integron recombination employs a replicative resolution mechanism for single-stranded substrates.
  • The attC x attI reaction does not involve a second strand exchange for Holliday junction resolution.
  • This finding clarifies a unique pathway in site-specific recombination.