Population-level transition of capsular polysaccharide types among sequence type 1 group B Streptococcus isolates with reduced penicillin susceptibility during a long-term hospital epidemic.
Project/Area Number |
15K09566
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Research Field |
Infectious disease medicine
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Research Institution | Shinshu University |
Principal Investigator |
Nagano Noriyuki 信州大学, 学術研究院保健学系, 教授 (00747371)
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Co-Investigator(Kenkyū-buntansha) |
小穴 こず枝 信州大学, 学術研究院保健学系, 准教授 (60115334)
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Project Period (FY) |
2015-04-01 – 2019-03-31
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Project Status |
Completed (Fiscal Year 2018)
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Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2015: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
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Keywords | B群レンサ球菌 / PRGBS / 莢膜スイッチング / CTBrPSGBS / ワクチン戦略 / ワクチン / 薬剤耐性 / 莢膜多糖体遺伝子クラスター / 血清型 / セフチブテン耐性ペニシリン感性GBS |
Outline of Final Research Achievements |
Group B Streptococcus isolates with reduced penicillin susceptibility (PRGBS) were detected from elderly patients, accompanying population-level transition of serotypes during a long-term hospital epidemic. Serotype III predominated in the first 9 months, which was replaced predominantly by serotype Ia for 9 months. Serotypes III and Ia isolates, belonging to ST1, shared four substitutions in penicillin-binding protein 2X. WGS revealed that the serotype III strain SU12 had a higher degree of genomic similarity with serotype Ia strain SU97. Moreover, the sequence characteristics of the disruption of the hyaluronidase gene located upstream of cpsY by insertion of IS1548 in strain SU12 and the insertion of ΔISSag8 between tRNA-Arg and rpsA genes located downstream of cpsL in strain SU97 were shared by other serotype III and Ia isolates, respectively. Capsular switching and nosocomial transmission may possibly contribute to population-level serotype replacement among ST1 PRGBS isolates.
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Academic Significance and Societal Importance of the Research Achievements |
PRGBSにおける莢膜スイッチングを促す要因として、抗菌薬によるbacterial stressや宿主の抗莢膜抗体による免疫圧が考えられる。莢膜スイッチング事象によりGBSが宿主抗体による免疫防御を回避する可能性は、WHO主導で進行中のワクチン開発戦略における障壁となることから本成果をInt J Antimicrob Agents 2019;53:203-210にて発表した。 また、選択圧となるβ-ラクタム剤の違いによって選択される耐性株がPRGBS株あるいはCTBrPSGBS株と異なる危険性を見出し、Microbiol Immunol 2019;63:65-76にて報告した。
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Report
(5 results)
Research Products
(44 results)
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[Journal Article] Effectual detection of group B streptococci with reduced penicillin susceptibility (PRGBS) by commercially available methicillin-resistant-Staphylococcus aureus (MRSA)-selective agar.2016
Author(s)
Fukigai S, Morimoto M, Kimura K, Doyama Y, Miyazaki A, Kamiya C, Banno H, Morishima E, Onoda T, Nagano N, Jin W, Wachino JI, Yamada K, Arakawa Y.
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Journal Title
Diagnostic Microbiology and Infectious Disease
Volume: 85
Issue: 3
Pages: 309-312
DOI
NAID
Related Report
Peer Reviewed
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[Journal Article] Comparative Analysis of Penicillin-Susceptible and Non-Susceptible Isolates of Group B Streptococci by Multilocus Sequence Typing2015
Author(s)
RyokoYamada, Kouji Kimura, NoriyukiNagano, Yukiko Nagano, Satowa Suzuki, Wanchun Jin, Jun-ichi Wachino, Keiko Yamada, Keigo Shibayama, Yoshichika Arakawa
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Journal Title
Japanese Journal of Infectious Diseases
Volume: 68
Issue: 4
Pages: 326-329
DOI
NAID
ISSN
1344-6304, 1884-2836
Related Report
Peer Reviewed / Open Access
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[Journal Article] Ceftibuten-containing agar plate for detecting group B streptococci with reduced penicillin susceptibility (PRGBS).2015
Author(s)
Chitose Kamiya, Kouji Kimura, Yo Doyama, Akira Miyazaki, Makiko Morimoto, Hirotsugu Banno, Noriyuki Nagano, Wanchun Jin, Jun-ichi Wachino, Keiko Yamada, Yoshichika Arakawa
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Journal Title
Diagnostic Microbiology and Infectious Disease
Volume: 82
Issue: 4
Pages: 269-273
DOI
Related Report
Peer Reviewed
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[Presentation] ペニシリン低感受性B群レンサ球菌sequence type 1の長期的流行に認められた血清型の集団的変遷事象へのcapsular switchingの関わり.2018
Author(s)
小坂駿介, 長野由紀子, 鈴木匡弘, 小出将太, 大崎裕介, 谷口唯, 林航, 小穴こず枝, 木村幸司, 荒川宣親, 長野則之
Organizer
第29回日本臨床微生物学会総会・学術総会
Related Report
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[Presentation] β-ラクタム系薬選択圧下におけるB群レンサ球菌のβ-ラクタム系薬耐性化への実験的考察2018
Author(s)
小出将太, 小坂駿介, 大崎裕介, 谷口唯, 林 航, 前山佳彦, 小穴こず枝, 木村幸司, 長野由紀子, 荒川宜親, 長野則之.
Organizer
第29回日本臨床微生物学会総会・学術集会
Related Report
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[Presentation] MRSA 臨床分離株の遺伝子型シフトに関する調査研究2017
Author(s)
小坂駿介, 大崎裕介, 齋藤さとみ, 前山佳彦, 長野則之, 佐藤智明, 長沢光章, 長野由紀子, 玉井清子, 鈴木匡弘, 谷本弘一, 奥住捷子, 富田治芳, 柴山恵吾, 荒川宜親
Organizer
第28回日本臨床微生物学会総会・学術集会
Place of Presentation
長崎ブリックホール(長崎県長崎市)
Year and Date
2017-01-20
Related Report
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[Presentation] 糞便由来チミジン要求性Escherichia coli small-colony variants の分子疫学解析2017
Author(s)
根岸 達哉, 松本 竹久, 春日 恵理子, 堀内 一樹, 名取 達矢, 竹原 健太, 三村 可奈恵, 松岡 美奈, 小坂 駿介, 長野 由紀子, 長野 則之
Organizer
第28回日本臨床微生物学会総会・学術集会
Place of Presentation
長崎ブリックホール(長崎県長崎市)
Year and Date
2017-01-20
Related Report
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[Presentation] MRSA臨床分離株の 遺伝子型シフトに関する調査研究2016
Author(s)
小坂駿介, 大崎裕介, 齋藤さとみ, 前山佳彦, 長野則之, 佐藤智明, 長沢光章, 長野由紀子, 玉井清子, 鈴木匡弘, 谷本弘一, 奥住捷子, 富田治芳, 柴山恵吾, 荒川宜親
Organizer
第45回薬剤耐性菌研究会
Place of Presentation
安芸グランドホテル( 広島県廿日市市 )
Year and Date
2016-10-21
Related Report
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