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Journal of Bacteriology, January 2005, p. 752-757, Vol. 187, No. 2
0021-9193/05/$08.00+0     doi:10.1128/JB.187.2.752-757.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Vibrios Commonly Possess Two Chromosomes

Kazuhisa Okada,1 Tetsuya Iida,1* Kumiko Kita-Tsukamoto,2 and Takeshi Honda1

Department of Bacterial Infections, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka,1 Marine Microbiology Division, Ocean Research Institute, University of Tokyo, Nakano-ku, Tokyo, Japan2

Received 2 July 2004/ Accepted 1 October 2004

The prevalence of the two-chromosome configuration was investigated in 34 species of vibrios and closely related species. Pulsed-field gel electrophoresis of undigested genomic DNA suggested that vibrios commonly have two chromosomes. The size of the large chromosome is predominantly within a narrow range (3.0 to 3.3 Mb), whereas the size of the small chromosome varies considerably among the vibrios (0.8 to 2.4 Mb). This fact suggests that the structure of the small chromosome is more flexible than that of the large chromosome during the evolution of vibrios.

* Corresponding author: Mailing address. Department of Bacterial Infections, Research Institute for Microbial Diseases, Osaka University, 3-1 Yamadaoka, Suita, Osaka 565-0871, Japan. Phone: 81-6-6879-8278. Fax: 81-6-6879-8277. E-mail: iida{at}biken.osaka-u.ac.jp.

Journal of Bacteriology, January 2005, p. 752-757, Vol. 187, No. 2
0021-9193/05/$08.00+0     doi:10.1128/JB.187.2.752-757.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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