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Investigation of the host cell feeding mechanisms of Cryptocaryon irritans.

Research Project

Project/Area Number 21K14914
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 40040:Aquatic life science-related
Research InstitutionThe University of Tokyo (2022-2023)
Obihiro University of Agriculture and Veterinary Medicine (2021)

Principal Investigator

Watanabe Yuho  東京大学, 大学院農学生命科学研究科(農学部), 助教 (40895893)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2023: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2021: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords寄生虫 / 原虫 / 繊毛虫 / 摂餌 / アポトーシス / ゲノム / 海産白点虫 / トランスクリプトーム / プロテアーゼ / ゲノム解析 / テトラヒメナ / 魚類寄生虫 / 機能解析 / in vitro培養
Outline of Research at the Start

魚類寄生性繊毛虫Cryptocaryon irritans (海産白点虫)が寄生することによる疾病、海産白点病は海面生簀など様々な海産魚養殖場で発生し、大きな産業被害を引き起こしているが、有効な防除法は確立されていない。一方、先行研究から寄生期虫体は宿主細胞にアポトーシスを誘導し、それを餌として摂食することが示唆されている。そのため、アポトーシスの誘導は本虫の生存戦略上重要な現象であると推察され、また、この現象を明らかにすることは海産白点病に対する防除法の開発への新たな糸口になると考えられる。そこで本研究では、多面的に研究を実施し、海産白点虫のアポトーシス誘導メカニズムの解明を試みる。

Outline of Final Research Achievements

The fish parasitic ciliate Cryptocaryon irritans is hypothesised to induce apoptosis in host cells, feeds on them and grows. This phenomenon is considered to be important for the survival strategy of the parasite, and elucidation of this phenomenon will assist in the development of control methods. In this study, it was demonstrated that host cells around the parasite undergo apoptosis and that the parasite feeds on them, providing fundamental knowledge on the feeding mechanism of the parasite. In addition, whole genome and transcriptome analyses were attempted to obtain sequence information and knowledge on the expression levels of various genes of the parasite.

Academic Significance and Societal Importance of the Research Achievements

海産白点虫は海産白点病の原因寄生虫である。海産白点病は海面生簀など様々な温水性海産魚養殖場で発生し、大きな産業被害を引き起こすことがあるが、有効な防除法は確立されていない。本研究では、本虫の摂餌機構の一端の解明に加えて、情報が不足していた多くの遺伝子情報の取得にも成功した。これらの成果は本虫に関する研究の基盤となる多くの情報を提供し、今後の対策研究を進展させることに貢献すると考えられる。

Report

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

    (9 results)

All 2024 2023 2022

All Journal Article (4 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 4 results,  Open Access: 2 results) Presentation (5 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Effect of Biokos, a natural lipopeptide surfactant extracted from a bacterium of the <i>Pseudomonas</i> genus, on infection of <i>Cryptocaryon irritans</i>2023

    • Author(s)
      Watanabe Yuho、Hansen Jorgen、Kotake Maho、Fujii Ryotaro、Matsuoka Hiromi、Yoshinaga Tomoyoshi
    • Journal Title

      Journal of Fish Diseases

      Volume: 46 Issue: 11 Pages: 1311-1319

    • DOI

      10.1111/jfd.13849

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Target Protein Expression on Tetrahymena thermophila Cell Surface Using the Signal Peptide and GPI Anchor Sequences of the Immobilization Antigen of Cryptocaryon irritans2023

    • Author(s)
      Watanabe Yuho、Asada Masahito、Inokuchi Mayu、Kotake Maho、Yoshinaga Tomoyoshi
    • Journal Title

      Molecular Biotechnology

      Volume: N/A Issue: 8 Pages: 1907-1918

    • DOI

      10.1007/s12033-023-00824-w

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Vaccine Development against Cryptocaryoniasis: A Review2022

    • Author(s)
      Yuho Watanabe, Tomoyoshi Yoshinaga
    • Journal Title

      Fish Pathology

      Volume: 57 Issue: 1 Pages: 1-10

    • DOI

      10.3147/jsfp.57.1

    • ISSN
      0388-788X, 1881-7335
    • Year and Date
      2022-03-15
    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Evaluation of the protective effects of DNA vaccines encoding an infection-related cysteine protease from Cryptocaryon irritans, the pathogenic organism of cryptocaryoniasis2022

    • Author(s)
      Yuho Watanabe, Yuzo Takada, Maho Kotake, Kosuke Zenke, Naoki Itoh, Tomoyoshi Yoshinaga
    • Journal Title

      Aquaculture

      Volume: 548 Pages: 737641-737641

    • DOI

      10.1016/j.aquaculture.2021.737641

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] 和歌山県で分離した海産白点虫 3 株の遺伝子配列と性質の比較2024

    • Author(s)
      松岡大海, 小竹真帆, 本領智記, 白樫 正, 良永知義, 伊藤直樹, 渡邊勇歩
    • Organizer
      日本魚病学会
    • Related Report
      2023 Annual Research Report
  • [Presentation] テトラヒメナを用いた偽海産白点虫の作製に向けた研究2023

    • Author(s)
      渡邊勇歩, 麻田正仁, 井ノ口繭, 小竹真帆, 伊藤直樹, 良永知義
    • Organizer
      日本魚病学会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Target protein expression on Tetrahymena cell-surface using the signal peptide and GPI-anchor sequences of a immobilization antigen of Cryptocaryon irritans2023

    • Author(s)
      Yuho Watanabe, Masahito Asada, Mayu Inokuchi, Maho Kotake, Tomoyoshi Yoshinaga
    • Organizer
      21st International Conference on Diseases of Fish and Shellfish
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] テトラヒメナを用いた偽海産白点虫の作製に向けた研究2023

    • Author(s)
      渡邊勇歩・麻田正仁・井ノ口繭・小竹真帆・ 伊藤直樹・良永知義
    • Organizer
      日本魚病学会春季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Studies on the development of vaccines targeting proteases of Cryptocaryon irritans, the parasitic ciliate of marine fishes2022

    • Author(s)
      Yuho Watanabe, Maho Kotake, Naoki Itoh, Tomoyoshi Yoshinaga
    • Organizer
      15th International Congress of Parasitology
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research

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

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