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Functional analysis of a novel virulence factor RatA contributing to the pathogenesis of fowl typhoid

Research Project

Project/Area Number 21K05926
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 42020:Veterinary medical science-related
Research InstitutionObihiro University of Agriculture and Veterinary Medicine

Principal Investigator

Okamura Masashi  帯広畜産大学, 畜産学部, 教授 (70374775)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywordsサルモネラ / 病原因子 / 家禽チフス / 病原性関連遺伝子
Outline of Research at the Start

本研究では、申請者が同定した家禽チフス発症機序に関与する50種類の病原性関連遺伝子のうち、ratAの家禽チフス発症機序における役割を明らかにする。すなわち、(1)ratAが上皮細胞への菌の接着・侵入に寄与する程度の評価、(2)RatAタンパク質が相互作用する宿主上皮細胞側の因子の同定、(3)抗RatA抗体によるSGのin vitro上皮細胞接着阻害およびin vivo感染制御効果の評価を行う。これにより、SG独自の病原機構の解明と家禽チフスの効果的な予防法開発へと展開するための研究基盤を確立することができ、同様の敗血症を引き起こす他の血清型によるサルモネラ感染症の制御への応用も期待される。

Outline of Final Research Achievements

The pathogenicity of SGΔratA, which lacks ratA, one of the genes of SG that is strongly expressed in chicken biology, was significantly reduced compared to the wild type, indicating that ratA contributes to the pathogenicity of SG. However, the pathogenicity of its complementary strain in chickens did not return to wild-type levels. Therefore, we focused on the possibility of suppressing the expression of ratB and shdA, which are downstream genes of ratA. We also examined the pathogenicity of SGΔratB and SGΔshdA lacking each gene in chickens, and found that the pathogenicity of both genes was not reduced as much as in the SGΔratA mutant strain. In other words, the involvement of these two genes in pathogenicity was considered to be partial compared to ratA.

Academic Significance and Societal Importance of the Research Achievements

同じサルモネラ属菌のネズミチフス菌(ST)では、ratAが STのマウス腸管腔内での生存に関わることが分かっている。しかし、本研究成果により、同じ遺伝子が宿主と血清型の組み合わせによって発症機序において果たす機能が異なることが分かった。このことは、発症機序に関わる新たな病原機構を標的とする家禽チフスの新規予防法の開発につながるだけでなく、サルモネラ感染症全般の発症機序解明の端緒となり、それらの新規予防法の開発に向けた基盤となる。

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

  • [Journal Article] wecB Gene of Salmonella Gallinarum Plays a Critical Role in Systemic Infection of Fowl Typhoid2022

    • Author(s)
      Ojima Shinjiro、Ono Hisaya K.、Okimoto Ryo、Yu Xiaoying、Sugiyama Makoto、Yoshioka Kazuki、Haneda Takeshi、Okamura Masashi、Hu Dong-Liang
    • Journal Title

      Frontiers in Microbiology

      Volume: 13 Pages: 880932-880932

    • DOI

      10.3389/fmicb.2022.880932

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Characteristics of systemic infection and host responses in chickens experimentally infected with <i>Salmonella enterica</i> serovar Gallinarum biovar Gallinarum2021

    • Author(s)
      OJIMA Shinjiro、OKAMURA Masashi、OSAWA Nana、TAMURA Akiko、YOSHIOKA Kazuki、KASHIMOTO Takashige、HANEDA Takeshi、ONO Hisaya K.、HU Dong-Liang
    • Journal Title

      Journal of Veterinary Medical Science

      Volume: 83 Issue: 7 Pages: 1147-1154

    • DOI

      10.1292/jvms.21-0227

    • NAID

      130008068193

    • ISSN
      0916-7250, 1347-7439
    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 家禽チフス菌の病原性関連因子の検索と同定2023

    • Author(s)
      岡村 雅史, 羽田 健, 鈴木 正太郎, 小野 久弥, 胡 東良
    • Organizer
      第88回日本細菌学会北海道支部学術総会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Avian salmonellosis: elucidation of a new aspect of the pathogenesis2023

    • Author(s)
      岡村雅史
    • Organizer
      第96回日本細菌学会総会
    • Related Report
      2022 Research-status Report
    • Invited

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

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