Capsule loss or death: The position of mutations among capsule genes sways the destiny of<i>Streptococcus suis</i>
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- Nattakan Lakkitjaroen
- Research Center for Food Safety; Graduate School of Agricultural and Life Sciences; The University of Tokyo; Tokyo Japan
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- Daisuke Takamatsu
- Bacterial and Parasitic Diseases Research Division; National Institute of Animal Health; National Agriculture and Food Research Organization; Tsukuba Ibaraki Japan
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- Masatoshi Okura
- Bacterial and Parasitic Diseases Research Division; National Institute of Animal Health; National Agriculture and Food Research Organization; Tsukuba Ibaraki Japan
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- Masumi Sato
- Epidemiological Information Section; National Institute of Animal Health; National Agriculture and Food Research Organization; Tsukuba Ibaraki Japan
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- Makoto Osaki
- Bacterial and Parasitic Diseases Research Division; National Institute of Animal Health; National Agriculture and Food Research Organization; Tsukuba Ibaraki Japan
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- Tsutomu Sekizaki
- Research Center for Food Safety; Graduate School of Agricultural and Life Sciences; The University of Tokyo; Tokyo Japan
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説明
Streptococcus suis, an emerging zoonotic pathogen, is responsible for various diseases in swine and humans. Most S. suis strains from clinical cases possess a group of capsular polysaccharide synthesis (cps) genes and phenotypically express capsular polysaccharides (CPs). Although CPs are considered to be an important virulence factor, our previous study showed that many S. suis isolates from porcine endocarditis lost their CPs, and some of these unencapsulated isolates had large insertions or deletions in the cps gene clusters. We further investigated 25 endocarditis isolates with no obvious genetic alterations to elucidate the unencapsulation mechanisms and found that a single-nucleotide substitution and frameshift mutation in two glycosyltransferase genes (cps2E and cps2F) were the main causes of the capsule loss. Moreover, mutations in the genes involved in side-chain formation (cps2J and cps2N), polymerase (cps2I), and flippase (cps2O) appeared to be lethal; however, these lethal effects were relieved by mutations in the cps2EF region. As unencapsulation and even the death of individual cells have recently been suggested to be beneficial to the pathogenesis of infections, the results of the present study provide a further insight into understanding the biological significance of cps mutations during the course of S. suis infections.
収録刊行物
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- FEMS Microbiology Letters
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FEMS Microbiology Letters 354 (1), 46-54, 2014-04-03
Oxford University Press (OUP)
