A new subtype of the metalloprotease toxin gene and the incidence of the three bft subtypes among Bacteroides fragilis isolates in Japan |
| |
Authors: | Kato N Liu C X Kato H Watanabe K Tanaka Y Yamamoto T Suzuki K Ueno K |
| |
Institution: | Institute of Anaerobic Bacteriology, Gifu University School of Medicine, 40 Tsukasa-machi, Gifu, Japan. nk19@cc.gifu-u.ac.jp |
| |
Abstract: | The bft gene encoding Bacteroides fragilis toxin (BFT) has been devided into two subtypes, bft-1 and bft-2. We found a novel subtype by sequencing a segment of the bft gene from 64 enterotoxigenic B. fragilis (ETBF) strains isolated in Japan. The 1548-bp nucleotide sequences of the new bft, the bft-1, and bft-2 genes were determined for five, four, and four ETBF strains, respectively; the nucleotide sequence was identical among each bft subtype and the degree of identity between each subtype was between 89 and 94%. Most of the variations between the three subtypes were detected in the region encoding mature toxin. A multiplex PCR was developed with a four-primer mix to subtype the bft sequences. The subtyping of 143 ETBF isolates from extraintestinal and stool specimens of humans and cows showed that the bft-1 was the most prevalent subtype, followed by bft-2 and a new bft subtype. No other subtype was found among the strains tested. |
| |
Keywords: | Toxin gene Metalloprotease Bacteroides fragilis |
本文献已被 PubMed 等数据库收录! |
|