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Vibrios commonly possess two chromosomes.

Kazuhisa Okada1, Tetsuya Iida, Kumiko Kita-Tsukamoto

  • 1Department of Bacterial Infections, Research Institute for Microbial Diseases, Osaka University, 3-1 Yamadaoka, Suita, Osaka 565-0871, Japan.

Journal of Bacteriology
|January 5, 2005
PubMed
Summary

Most vibrios possess two chromosomes, with a consistently sized large chromosome and a highly variable small chromosome. This indicates the small chromosome

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Area of Science:

  • Microbiology
  • Genomics
  • Bacterial Evolution

Background:

  • The genomic structure of Vibrio species is crucial for understanding their evolutionary dynamics.
  • Bacterial genomes can exhibit complex structures, including multiple chromosomes.

Purpose of the Study:

  • To investigate the prevalence of a two-chromosome configuration in 34 Vibrio and related species.
  • To analyze the size variation of these chromosomes and infer evolutionary implications.

Main Methods:

  • Pulsed-field gel electrophoresis (PFGE) was employed to analyze the genomic DNA of 34 Vibrio species.
  • Undigested genomic DNA was used to visualize and size the bacterial chromosomes.

Main Results:

  • The study confirmed that a two-chromosome configuration is common in the investigated Vibrio species.
  • The large chromosome size was consistently observed between 3.0 and 3.3 Mb across species.
  • The small chromosome size showed significant variation, ranging from 0.8 to 2.4 Mb.

Conclusions:

  • Vibrios commonly possess a bipartite genome, consisting of a large and a small chromosome.
  • The observed size variability of the small chromosome suggests it is more evolutionarily plastic than the large chromosome.
  • This genomic plasticity of the small chromosome likely plays a significant role in Vibrio evolution.

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