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The evolution of insertion sequences within enteric bacteria.

J G Lawrence1, H Ochman, D L Hartl

  • 1Department of Genetics, Washington University School of Medicine, St. Louis, Missouri 63110.

Genetics
|May 1, 1992
PubMed
Summary
This summary is machine-generated.

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Bacterial transposons, like insertion sequences (IS), evolve rapidly within Escherichia coli but move slower between species. Recombination and horizontal gene transfer drive their evolution across bacterial taxa.

Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Genetics

Background:

  • Bacterial transposons, specifically insertion sequences (IS), are mobile genetic elements crucial for bacterial genome evolution.
  • Understanding the evolutionary mechanisms of IS, such as their movement and variation, is key to comprehending bacterial adaptation and genome dynamics.

Purpose of the Study:

  • To investigate the evolutionary mechanisms shaping bacterial transposons.
  • To compare the variation and dynamics of insertion sequences (IS1, IS3, IS30) in natural strains of Escherichia coli and related enteric bacteria.

Main Methods:

  • DNA sequence analysis of insertion sequence homologs (IS1, IS3, IS30).
  • Comparative genomics of sequences from diverse strains of Escherichia coli and other enteric bacteria.

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Main Results:

  • Insertion sequences within E. coli exhibit high sequence conservation (>99.7%) but rapid turnover and movement among lineages.
  • Bacterial transposons show less length polymorphism than eukaryotic counterparts, suggesting fewer nonfunctional elements.
  • IS elements in other enteric species are divergent from E. coli, indicating slower inter-species mobilization.
  • Evidence of recombination and horizontal transfer shaping IS1 and IS3 evolution across species.

Conclusions:

  • Bacterial transposons undergo rapid evolution within species, driven by high turnover and movement.
  • Inter-species transfer of bacterial transposons is less frequent but significant, facilitated by recombination and horizontal gene transfer.
  • Evolutionary history of IS1 and IS3 involves complex recombination and horizontal transfer events across diverse bacterial taxa.