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Phylodynamics of regional Streptococcus pneumoniae serotype 19A-ST320 lineage in Okinawa prefecture and the analysis of pbp1a transmission between different pneumococcal clones in Japan

Research Project

Project/Area Number 21K15432
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 49050:Bacteriology-related
Research InstitutionNational Institute of Infectious Diseases

Principal Investigator

Nakano Satoshi  国立感染症研究所, 薬剤耐性研究センター, 主任研究官 (30794987)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2022: ¥130,000 (Direct Cost: ¥100,000、Indirect Cost: ¥30,000)
Fiscal Year 2021: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Keywords肺炎球菌 / 全ゲノム解析 / 系統地理解析 / 19A-ST320 / 侵襲性肺炎球菌感染症 / カルバペネム耐性 / pbp1a
Outline of Research at the Start

本研究は肺炎球菌ワクチンの定期接種化後に本邦に出現したカルバペネム耐性肺炎球菌の発生原因の本質に迫る研究である。同菌株はpbp1a-13という耐性に寄与する遺伝子を保持しているが、現時点では同遺伝子の由来は定かでない。しかし、最近になって沖縄県を中心に同遺伝子を保持している肺炎球菌が検出されている。本研究では全ゲノム解析を用いて、この沖縄株の由来と沖縄株と本島株との関連性を調べる。

Outline of Final Research Achievements

To clary the transmission route and the spread dynamic of Streptococci in a local region, we analyzed serotyepe 19A-ST320 isolates collected in Okinawa prefecture using whole genome sequencing. This clone is knows as one of the multi-drug resistant pneumococcal clones that was spread globally after the introduction of 7 valent-pneumococcal conjugate vaccine, however, it was endemic only in Okinawa prefecture in Japan.
Our study showed that the ancestor of the endemic 19A-ST320 isolates in Okinawa seemed to have imported from the U.S. before 2000 resulting in the regional spread in Okinawa, Japan.

Academic Significance and Societal Importance of the Research Achievements

本研究は、高齢者の市中肺炎の最も主要な起炎菌の一つである肺炎球菌が海外から流入し、時間経過の後に地域流行を引き起こすことを提案するものである。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • Research Products

    (4 results)

All 2023 2022 2021

All Journal Article (2 results) Presentation (2 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Frequent Transmission of Streptococcus pneumoniae Serotype 35B and 35D, Clonal Complex 558 Lineage, across Continents and the Formation of Multiple Clades in Japan2023

    • Author(s)
      Shinohara Koh、Fujisawa Takao、Chang Bin、Ito Yutaka、Suga Shigeru、Matsumura Yasufumi、Yamamoto Masaki、Nagao Miki、Ohnishi Makoto、Sugai Motoyuki、Nakano Satoshi
    • Journal Title

      Antimicrobial Agents and Chemotherapy

      Volume: 67 Issue: 2

    • DOI

      10.1128/aac.01083-22

    • Related Report
      2022 Research-status Report
  • [Journal Article] Whole-Genome Analysis-Based Phylogeographic Investigation of Streptococcus pneumoniae Serotype 19A Sequence Type 320 Isolates in Japan2022

    • Author(s)
      Nakano Satoshi、Fujisawa Takao、Chang Bin、Ito Yutaka、Akeda Hideki、Fujita Jiro、Matsumura Yasufumi、Yamamoto Masaki、Suga Shigeru、Oishi Kazunori、Nagao Miki、Ohnishi Makoto
    • Journal Title

      Antimicrobial Agents and Chemotherapy

      Volume: 66 Issue: 2

    • DOI

      10.1128/aac.01395-21

    • Related Report
      2022 Research-status Report 2021 Research-status Report
  • [Presentation] 本邦のベータラクタム薬耐性肺炎球菌増加の主たる原因はPCV導入以前のPBP1A水平伝播とクローン性拡散である2023

    • Author(s)
      中野哲志
    • Organizer
      第97回日本感染症学会総会・学術講演会第71回日本化学療法学会学術集会 合同学会
    • Related Report
      2022 Research-status Report
  • [Presentation] Molecular epidemiology of pneumococcal isolates in Japan2021

    • Author(s)
      Satoshi Nakano
    • Organizer
      第3回アジア肺炎球菌シンポジウム
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

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Published: 2021-04-28   Modified: 2025-01-30  

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