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Journal of Clinical Microbiology, June 1999, p. 1714-1720, Vol. 37, No. 6
0095-1137/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Identification of Mycobacterial Species by
Comparative Sequence Analysis of the RNA Polymerase Gene
(rpoB)
Bum-Joon
Kim,1
Seung-Hyun
Lee,1
Mi-Ae
Lyu,1
Seo-Jeong
Kim,2
Gill-Han
Bai,3
Sang-Jae
Kim,3
Gue-Tae
Chae,4
Eui-Chong
Kim,5
Chang-Yong
Cha,1 and
Yoon-Hoh
Kook1,*
Department of Microbiology and Cancer
Research Center1 and Department of
Clinical Pathology,5 Seoul National University
College of Medicine, Seoul 110-799, Department of Pediatrics,
Pundang CHA General Hospital, Pochun CHA Medical School, Kyonggi-do
Sungnam 463-670,2 Korean Institute of
Tuberculosis, Korean National Tuberculosis Association, Seoul
137-140,3 and Institute of Hansen's
Disease, The Catholic University Medical College, Seoul
137-7014,4 Korea
Received 30 November 1998/Returned for modification 14 January
1999/Accepted 2 March 1999
For the differentiation and identification of mycobacterial
species, the rpoB gene, encoding the
subunit of RNA
polymerase, was investigated. rpoB DNAs (342 bp) were
amplified from 44 reference strains of mycobacteria and clinical
isolates (107 strains) by PCR. The nucleotide sequences were directly
determined (306 bp) and aligned by using the multiple alignment
algorithm in the MegAlign package (DNASTAR) and the MEGA program. A
phylogenetic tree was constructed by the neighbor-joining method.
Comparative sequence analysis of rpoB DNAs provided the
basis for species differentiation within the genus
Mycobacterium. Slowly and rapidly growing groups of
mycobacteria were clearly separated, and each mycobacterial species was
differentiated as a distinct entity in the phylogenetic tree.
Pathogenic Mycobacterium kansasii was easily differentiated from nonpathogenic M. gastri; this differentiation cannot
be achieved by using 16S rRNA gene (rDNA) sequences. By being grouped
into species-specific clusters with low-level sequence divergence among strains of the same species, all of the clinical isolates could be
easily identified. These results suggest that comparative sequence analysis of amplified rpoB DNAs can be used efficiently to
identify clinical isolates of mycobacteria in parallel with traditional culture methods and as a supplement to 16S rDNA gene analysis. Furthermore, in the case of M. tuberculosis, rifampin
resistance can be simultaneously determined.
*
Corresponding author. Mailing address: Department of
Microbiology, Seoul National University College of Medicine, 28 Yongon-dong, Chongno-gu, Seoul 110-799, Korea. Phone: (82) 2-740-8313. Fax: (82) 2-743-0881. E-mail:
yhkook{at}plaza.snu.ac.kr.
Journal of Clinical Microbiology, June 1999, p. 1714-1720, Vol. 37, No. 6
0095-1137/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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