Adaptation of the Freshwater Bloom-Forming Cyanobacterium Microcystis aeruginosa to Brackish Water Is Driven by Recent Horizontal Transfer of Sucrose Genes
| Autor: | Makoto Watanabe, Kiyoshi Tada, Yuuhiko Tanabe, Yoshikuni Hodoki, Tomoharu Sano |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Microbiology (medical) Microcystis 030106 microbiology lcsh:QR1-502 ecotype Microcystin Microbiology Genome lcsh:Microbiology genomics /brackish water 03 medical and health sciences horizontal gene trasnfer Botany genomics Microcystis aeruginosa bloom chemistry.chemical_classification salt tolerance biology Brackish water fungi sucrose Cyanotoxin biology.organism_classification chemistry Horizontal gene transfer Eutrophication brackish water |
| Zdroj: | Frontiers in Microbiology, Vol 9 (2018) |
| ISSN: | 1664-302X |
| Popis: | 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. 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. |
| Databáze: | OpenAIRE |
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