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A Novel Plasmid Carrying Capsule Gene Cluster Found in Lactococcus garvieae Isolated from Filefish


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タイトル: A Novel Plasmid Carrying Capsule Gene Cluster Found in Lactococcus garvieae Isolated from Filefish
著者: Kanai, Kinya / Tsujikura, Masakazu / Shutou, Kimihiro / Honma, Toshio / Matsumoto, Fumihiro / Suga, Koushirou / Takagi, Shusaku / Fukuda, Yutaka / Sugihara, Yukitaka
発行日: 2017年 6月
出版者: 日本魚病学会 / The Japanese Society of Fish Pathology
引用: Fish Pathology, 52(2), pp.82-88; 2017
抄録: Lactococcus garvieae is recognized as a crucial bacterial pathogen of freshwater and marine fish species. It has been divided into two serological phenotypes, namely KG− and KG+. Difference of the two phenotypes is owing to the presence or absence of polysaccharide capsule, and a phenotypic change from KG− to KG+ occurs during stocking of isolates for a long period or by repeated subculturing. We found that the phenotypic change occurred more readily in L. garvieae isolates from cultured filefish, thread-sail filefish Stephanolepis cirrhifer and black scraper Thamnaconus modestus, than those from other fish species. Thus we studied the gene cluster for capsular polysaccharide biosynthesis (capsule gene cluster) of a filefish isolate, strain BSLG13015, and revealed that the strain possessed the same capsule gene cluster as those from other fish species, but that it was integrated in a newly identified plasmid. The plasmid, a size of 31,654 bp and circular, was named pBSLG13015. It was detected in all of KG− filefish isolates but not in KG+ filefish isolates or L. garvieae from other fish species. It is highly probable that the easier change from KG− to KG+ in L. garvieae filefish isolates is attributed to the loss of the plasmid.
キーワード: Lactococcus garvieae / capsule gene cluster / plasmid / filefish / KG− / KG+ / phenotypic change
URI: http://hdl.handle.net/10069/37692
ISSN: 0388788X
DOI: 10.3147/jsfp.52.82
権利: © 2017 The Japanese Society of Fish Pathology
資料タイプ: Journal Article
原稿種類: publisher
出現コレクション:080 学術雑誌論文

引用URI : http://hdl.handle.net/10069/37692

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