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タイトル: | Adaptation of the Freshwater Bloom-Forming Cyanobacterium Microcystis aeruginosa to Brackish Water Is Driven by Recent Horizontal Transfer of Sucrose Genes |
著者: | Tanabe, Yuuhiko Hodoki, Yoshikuni Sano, Tomoharu Tada, Kiyoshi Watanabe, Makoto M. |
著者名の別形: | 田辺, 雄彦 程木, 義邦 佐野, 友春 多田, 清志 渡邉, 信 |
キーワード: | Microcystis bloom salt tolerance sucrose genomics /brackish water horizontal gene trasnfer ecotype |
発行日: | 5-Jun-2018 |
出版者: | Frontiers Media SA |
誌名: | Frontiers in Microbiology |
巻: | 9 |
論文番号: | 1150 |
抄録: | Microcystis aeruginosa is a bloom-forming cyanobacterium found in eutrophic water bodies worldwide. M. aeruginosa blooms usually occur in freshwater; however, they have also been reported to occur in brackish water. Because M. aeruginosa often produces the cyanotoxin microcystin, they are a major concern to public health and environment. Despite this, the ecology, genomic basis, and evolutionary process underlying the M. aeruginosa bloom invasion from fresh to brackish water have been poorly investigated. Hence, in the present study, we have sequenced and characterized genomes of two newly discovered salt-tolerant M. aeruginosa strains obtained from Japanese brackish water lakes (Lakes Shinji and Tofutsu). Both genomes contain a set of genes for the synthesis of osmolyte sucrose (sppA, spsA, and susA), hitherto identified in only one strain (PCC 7806) of M. aeruginosa. Chemical and gene expression analyses confirmed sucrose accumulation induced by salt. A comprehensive genetic survey of >200 strains indicated that sucrose genes are extremely rare in M. aeruginosa. Most surprisingly, comparative genome analyses of the three strains indicated extremely low genetic diversity in the sucrose genes compared with other core genome genes, suggesting very recent acquisitions via horizontal transfer. Invasion of M. aeruginosa blooms into brackish water may be a recent event triggered by anthropogenic eutrophication of brackish water. |
記述: | 宍道湖、網走湖などの汽水湖でアオコが出現するメカニズムを解明しました. 京都大学プレスリリース. 2018-06-20. |
著作権等: | © 2018 Tanabe, Hodoki, Sano, Tada and Watanabe. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. |
URI: | http://hdl.handle.net/2433/231981 |
DOI(出版社版): | 10.3389/fmicb.2018.01150 |
PubMed ID: | 29922255 |
関連リンク: | https://www.kyoto-u.ac.jp/ja/research-news/2018-06-20-1 |
出現コレクション: | 学術雑誌掲載論文等 |
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