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Applied and Environmental Microbiology, May 1999, p. 2202-2208, Vol. 65, No. 5
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Analysis of 16S-23S rRNA Intergenic Spacer Regions
of Vibrio cholerae and Vibrio
mimicus
Jongsik
Chun,
Anwarul
Huq, and
Rita R.
Colwell*
Center of Marine Biotechnology, University of
Maryland Biotechnology Institute, Baltimore, Maryland 21202
Received 10 November 1998/Accepted 17 February 1999
Vibrio cholerae identification based on molecular
sequence data has been hampered by a lack of sequence variation from
the closely related Vibrio mimicus. The two species share
many genes coding for proteins, such as ctxAB, and show
almost identical 16S DNA coding for rRNA (rDNA) sequences. Primers
targeting conserved sequences flanking the 3' end of the 16S and the 5'
end of the 23S rDNAs were used to amplify the 16S-23S rRNA intergenic
spacer regions of V. cholerae and V. mimicus.
Two major (ca. 580 and 500 bp) and one minor (ca. 750 bp) amplicons
were consistently generated for both species, and their sequences were
determined. The largest fragment contains three tRNA genes
(tDNAs) coding for tRNAGlu,
tRNALys, and tRNAVal, which has
not previously been found in bacteria examined to date. The 580-bp
amplicon contained tDNAIle and tDNAAla, whereas
the 500-bp fragment had single tDNA coding either
tRNAGlu or tRNAAla. Little
variation, i.e., 0 to 0.4%, was found among V. cholerae O1
classical, O1 El Tor, and O139 epidemic strains. Slightly more variation was found against the non-O1/non-O139 serotypes (ca. 1%
difference) and V. mimicus (2 to 3% difference). A pair of oligonucleotide primers were designed, based on the region
differentiating all of V. cholerae strains from V. mimicus. The PCR system developed was subsequently evaluated by
using representatives of V. cholerae from environmental and
clinical sources, and of other taxa, including V. mimicus.
This study provides the first molecular tool for identifying the
species V. cholerae.
*
Corresponding author. Mailing address: University of
Maryland Biotechnology Institute, Center of Marine Biotechnology, 701 East Pratt St., Ste. 236, Baltimore, MD 21202. Phone: (410) 234-8885. Fax: (410) 234-8873. E-mail: colwell{at}umbi.umd.edu.

Present address: Korean Collection for Type Cultures, Korean
Research Institute of Bioscience and Biotechnology, Yusong, Taejon
305-600, Republic of
Korea.
Applied and Environmental Microbiology, May 1999, p. 2202-2208, Vol. 65, No. 5
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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