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Research on the relationship between psm-mec mutations and MRSA virulence

Research Project

Project/Area Number 15H05279
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section海外学術
Research Field Bacteriology (including mycology)
Research InstitutionOkayama University (2017-2019)
The University of Tokyo (2015-2016)

Principal Investigator

Kaito Chikara  岡山大学, 医歯薬学総合研究科, 教授 (60420238)

Co-Investigator(Kenkyū-buntansha) 松本 靖彦  東京大学, 薬学研究科(研究院), 助教 (60508141)
Project Period (FY) 2015-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥15,990,000 (Direct Cost: ¥12,300,000、Indirect Cost: ¥3,690,000)
Fiscal Year 2018: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2017: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2016: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2015: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Keywordspsm-mec / MRSA / 毒素 / 病原性 / 感染症 / SCCmec / 可動遺伝要素 / 細菌 / ゲノム / 遺伝子 / 臨床
Outline of Final Research Achievements

In MRSA isolates in Japan, strains carrying psm-mec gene mutations produce higher amounts of toxins than those carrying intact psm-mec gene. However, it is not known whether this theory is applicable to other MRSA strains having different genetic backgrounds from the MRSA isolates in Japan. In this study, we isolated MRSA strains from north and center regions of Thailand and revealed that strains carrying psm-mec mutations produce higher amounts of toxins than those carrying intact psm-mec. In addition, the MRSA isolates in Thailand had different genetic backgrounds from the MRSA isolates in Japan. These results suggest that psm-mec mutations cause high toxin production in MRSA isolates having various genetic backgrounds.

Academic Significance and Societal Importance of the Research Achievements

メチシリン耐性黄色ブドウ球菌(MRSA)は世界規模で流行する病原性細菌であり、新しい治療法と予防法の確立が急務である。本研究では、海外で流行するMRSAにおいて、psm-mec遺伝子の変異の有無が毒素産生量と対応していることを見出した。本研究結果は、psm-mecの変異の有無を検出することが、患者から分離されたMRSA株の危険度を判定する上で有効であることを示唆している。

Report

(5 results)
  • 2019 Final Research Report ( PDF )
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • 2016 Annual Research Report
  • 2015 Annual Research Report
  • Research Products

    (8 results)

All 2020 2017 2016 2015 Other

All Int'l Joint Research (2 results) Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (3 results) (of which Int'l Joint Research: 1 results,  Invited: 2 results)

  • [Int'l Joint Research] Khon Kaen University/Nakhonratchasima College/Phramongkutklao College of Medicine(タイ)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] Khon Kaen University(タイ)

    • Related Report
      2016 Annual Research Report
  • [Journal Article] Epidemiological study on the relationship between toxin production and psm‐mec mutations in MRSA isolates in Thailand2020

    • Author(s)
      Tabuchi Fumiaki、Lulitanond Aroonlug、Lulitanond Viraphong、Thunyaharn Sudaluck、Kaito Chikara
    • Journal Title

      Microbiology and Immunology

      Volume: 64 Issue: 3 Pages: 219-225

    • DOI

      10.1111/1348-0421.12764

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Impact of psm-mec in Methicillin-Resistant Staphylococcus aureus (ST764) Strains Isolated from Keratitis Patients2016

    • Author(s)
      Suzuki T, Yamamoto T, Kaito C, Miyamoto H, Ohashi Y
    • Journal Title

      Microb Drug Resist.

      Volume: in press. Issue: 7 Pages: 589-597

    • DOI

      10.1089/mdr.2015.0315

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Phenotypic and genomic comparisons of highly vancomycin-resistant Staphylococcus aureus strains developed from multiple clinical MRSA strains by in vitro mutagenesis2015

    • Author(s)
      Ishii K, Tabuchi F, Matsuo M, Tatsuno K, Sato T, Okazaki M, Hamamoto H, Matsumoto Y, Kaito C, Aoyagi T, Hiramatsu K, Kaku M, Moriya K, Sekimizu K.
    • Journal Title

      Sci Rep

      Volume: 5 Issue: 1 Pages: 17092-17092

    • DOI

      10.1038/srep17092

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] タイにおいて、psm-mecの変異を有するMRSA株は毒素産生量が上昇している2017

    • Author(s)
      田渕 史晃、Aroonlug Lulitanond、Viraphong Lulitanond、垣内 力
    • Organizer
      第90回日本細菌学会総会
    • Related Report
      2016 Annual Research Report
  • [Presentation] 黄色ブドウ球菌の菌体表層における毒素の機能2017

    • Author(s)
      垣内 力
    • Organizer
      第90回日本細菌学会総会
    • Related Report
      2016 Annual Research Report
    • Invited
  • [Presentation] Mobile genetic element of MRSA encodes a virulence suppressor2015

    • Author(s)
      Chikara Kaito
    • Organizer
      The 14th Awaji International Forum on Infection and Immunity
    • Place of Presentation
      淡路夢舞台国際会議場、兵庫県淡路市
    • Year and Date
      2015-09-09
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research / Invited

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Published: 2015-04-16   Modified: 2022-11-04  

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