rDNA sequence analyses of Streptococcus dysgalactiae subsp equisimilis isolates from pigs

被引:22
作者
Kawata, K [1 ]
Minakami, T
Mori, Y
Katsumi, M
Kataoka, Y
Ezawa, A
Kikuchi, N
Takahashi, T
机构
[1] Rakuno Gakuen Univ, Sch Vet Med, Dept Epizootiol, Ebetsu, Hokkaido 0698501, Japan
[2] Sendai Meat Inspect Ctr, Sendai, Miyagi 983, Japan
[3] Nippon Vet & Anim Sci Univ, Dept Vet Microbiol, Musashino, Tokyo 180, Japan
关键词
D O I
10.1099/ijs.0.02666-0
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
The nucleotide sequences of 16S and 23S rRNA genes (rDNA) were determined for 11 isolates of Streptococcus dysgalactiae subsp. equisimilis from slaughtered pigs with endocarditis, arthritis or lymphadenitis and strain ATCC 35666, designated as a strain of subspecies equisimilis. The sequences of each of the genes were compared phylogenetically with the corresponding sequences of S. dysgalactiae subsp. dysgalactiae ATCC 43078(T) and ATCC 27957, which were also determined in this study. Based on the 16S rDNA analysis, the isolates of S. dysgalactiae subsp. equisimilis were divided into two distinct groups, designated groups 1 and 2.S. dysgalactiae subsp. equisimilis ATCC 35666 was closely related to the group 2 strains. The S. dysgalactiae subsp. dysgalactiae strains seemed to be associated with the group 1 strains, which was not consistent with the conventional subspecific classification of S. dysgalactiae. In contrast, the 23S rDNA analysis distinguished S. dysgalactiae subsp. dysgalactiae strains from subsp. equisimilis strains. This inconsistency between phylogenies based on 16S and 23S rDNA indicates that 23S rDNA is a more rigid marker for determining the phylogenetic relationships and taxonomic position of these organisms than is 16S rDNA.
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页码:1941 / 1946
页数:6
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