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Establishment of RNAi system in Plasmodium falciparum

Research Project

Project/Area Number 19K22535
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 49:Pathology, infection/immunology, and related fields
Research InstitutionEhime University

Principal Investigator

Tsuboi Takafumi  愛媛大学, プロテオサイエンスセンター, 教授 (00188616)

Co-Investigator(Kenkyū-buntansha) 高島 英造  愛媛大学, プロテオサイエンスセンター, 准教授 (50366762)
Project Period (FY) 2019-06-28 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2020: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2019: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywordsマラリア原虫 / RNAi
Outline of Research at the Start

マラリアの病態解明に関わる赤血球期マラリア原虫の遺伝子ノックアウトを行うと、ほとんどの場合で致死であり、遺伝子の機能の解明には至らない。一方、他分野の研究で一般的な遺伝子ノックダウン技術はマラリア原虫にはRNAiに必須な分子群(RISC)が欠落しているため不可能である。そこで本研究では、新技術マラリア人工染色体を利用してマラリア原虫に恒常的にヒトRISCを発現させ、RNAiが機能するマラリア原虫を作出することを目的に行う。本研究によってRNAi を行うことができるマラリア原虫株を樹立することができれば、遺伝子ノックダウンにおける技術的障壁を取り払うことが可能となる。

Outline of Final Research Achievements

In most eukaryotes, tools for gene knockdown is available in the form of RNA interference (RNAi). However, malaria parasites lack the endogenous RNAi machinery (RISC). The lack hampers gene annotation and hence antimalarial drug and vaccine development. In this extremely challenging study, we tried to introduce the RNAi machinery of human origin into the malaria parasite and thus created RNAi-competent malaria parasite that permit inhibition of gene expression on the mRNA level. During this project, a group of oversea scientists published a success of generating transgenic rodent malaria parasite which expressing a human RNAi machinery. However, It is well-known that the technology for transgenesis in human malaria parasite which we are targeting is quite different from the one for rodent malaria parasite and is more difficult to achieve. Therefore, we are still conducting our best efforts on this technology establishment.

Academic Significance and Societal Importance of the Research Achievements

マラリア原虫は複雑なライフサイクルを持ち、多くのユニークな遺伝子配列を持つ。これらの遺伝子がコードする原虫特異的なタンパク質の機能解析は、新規な治療薬やマラリアワクチンの開発等に重要であるがほとんど進んでいない。その理由としては、赤血球期マラリア原虫のRNAiによる遺伝子ノックダウン技術が機能しないことが大きな理由である。本研究によってRNAi を行うことができるマラリア原虫株を樹立することができれば、マラリア原虫の生活環を維持するのに重要な遺伝子を探索することが容易となるため、創薬やワクチンの標的となるマラリア原虫タンパク質の発見を加速できる。

Report

(3 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • Research Products

    (24 results)

All 2020 2019 Other

All Journal Article (14 results) (of which Int'l Joint Research: 7 results,  Peer Reviewed: 14 results,  Open Access: 10 results) Presentation (8 results) (of which Int'l Joint Research: 3 results,  Invited: 3 results) Remarks (2 results)

  • [Journal Article] Molecular cloning and characterization of plerocercoid-immunosuppressive factor from Spirometra erinaceieuropaei2020

    • Author(s)
      Kondo Yoko、Ito Daisuke、Tademoto Sayuri、Itami Nanase、Nishikata Shuma、Takashima Eizo、Tsuboi Takafumi、Fukumoto Soji、Otsuki Hitoshi
    • Journal Title

      Parasitology International

      Volume: 76 Pages: 102062-102062

    • DOI

      10.1016/j.parint.2020.102062

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Skeleton binding protein 1 (SBP1) of Plasmodium falciparum accumulates in electron-dense material before passing through the parasitophorous vacuole membrane2020

    • Author(s)
      Iriko Hideyuki、Ishino Tomoko、Tachibana Mayumi、Omoda Ayaka、Torii Motomi、Tsuboi Takafumi
    • Journal Title

      Parasitology International

      Volume: 75 Pages: 102003-102003

    • DOI

      10.1016/j.parint.2019.102003

    • NAID

      120006818752

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Observation of Morphological Changes of Female Osmiophilic Bodies Prior to Plasmodium Gametocyte Egress From Erythrocytes2020

    • Author(s)
      Ishino T, Tachibana M, Baba M, Iriko H, Tsuboi T, Torii M.
    • Journal Title

      Mol Biochem Parasitol

      Volume: 236 Pages: 111261-111261

    • DOI

      10.1016/j.molbiopara.2020.111261

    • NAID

      120006873067

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Recovery and stable persistence of chloroquine sensitivity in Plasmodium falciparum parasites after its discontinued use in Northern Uganda2020

    • Author(s)
      Balikagala Betty、Sakurai-Yatsushiro Miki、Hirai Makoto  et al
    • Journal Title

      Malaria Journal

      Volume: 19 Issue: 1 Pages: 1-12

    • DOI

      10.1186/s12936-020-03157-0

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The C-terminal region of the Plasmodium yoelii microgamete surface antigen PyMiGS induces potent anti-malarial transmission-blocking immunity in mice2020

    • Author(s)
      Tachibana Mayumi、Baba Minami、Takashima Eizo、Tsuboi Takafumi、Torii Motomi、Ishino Tomoko
    • Journal Title

      Vaccine

      Volume: 38 Issue: 15 Pages: 3129-3136

    • DOI

      10.1016/j.vaccine.2020.02.058

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Antibodies against a short region of PfRipr inhibit Plasmodium falciparum merozoite invasion and PfRipr interaction with Rh5 and SEMA7A2020

    • Author(s)
      Nagaoka Hikaru、Kanoi Bernard N.、Ntege Edward H.、Aoki Masamitsu、Fukushima Akihisa、Tsuboi Takafumi、Takashima Eizo
    • Journal Title

      Scientific Reports

      Volume: 10 Issue: 1 Pages: 1-14

    • DOI

      10.1038/s41598-020-63611-6

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] The malaria parasite Plasmodium falciparum in red blood cells selectively takes up serum proteins that affect host pathogenicity2020

    • Author(s)
      Tougan Takahiro、Edula Jyotheeswara R.、Morita Masayuki、Takashima Eizo、Honma Hajime、Tsuboi Takafumi、Horii Toshihiro
    • Journal Title

      Malaria Journal

      Volume: 19 Issue: 1 Pages: 155-155

    • DOI

      10.1186/s12936-020-03229-1

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Development and validation of serological markers for detecting recent Plasmodium vivax infection2020

    • Author(s)
      Longley Rhea J.、White Michael T.、Takashima Eizo et al
    • Journal Title

      Nature Medicine

      Volume: 26 Issue: 5 Pages: 741-749

    • DOI

      10.1038/s41591-020-0841-4

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Global repertoire of human antibodies against Plasmodium falciparum RIFINs, SURFINs, and STEVORs in a malaria exposed population2020

    • Author(s)
      Kanoi Bernard N.、Nagaoka Hikaru、Morita Masayuki、White Michael T.、Palacpac Nirianne M.Q.、Ntege Edward H.、Balikagala Betty、Yeka Adoke、Egwang Thomas G.、Horii Toshihiro、Tsuboi Takafumi、Takashima Eizo
    • Journal Title

      Frontiers in Immunology

      Volume: "" Pages: 1-12

    • DOI

      10.3389/fimmu.2020.00893

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Characterization of mitochondrial carrier proteins of malaria parasite Plasmodium falciparum based on in vitro translation and reconstitution2020

    • Author(s)
      Nozawa Akira、Ito Daisuke、Ibrahim Mohamed、Santos Herbert J.、Tsuboi Takafumi、Tozawa Yuzuru
    • Journal Title

      Parasitology International

      Volume: 79 Pages: 102160-102160

    • DOI

      10.1016/j.parint.2020.102160

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Serodiagnostic antigens of Clonorchis sinensis identified and evaluated by high-throughput proteogenomics2020

    • Author(s)
      Cho Pyo Yun、Lee Ji-Yun、Kim Tae Im、Song Jin-Ho、Hong Sung-Jong、Yoo Won Gi、Tsuboi Takafumi、Ha Kwon-Soo、Jung Jae-Wan、Takeo Satoru、Han Eun-Taek、Sripa Banchob、Hong Sung-Tae、Chai Jong-Yil、Nam Ho-Woo、Pak Jhang Ho、Kim Tong-Soo
    • Journal Title

      PLOS Neglected Tropical Diseases

      Volume: 14 Issue: 12 Pages: e0008998-e0008998

    • DOI

      10.1371/journal.pntd.0008998

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A comparison of non-magnetic and magnetic beads for measuring IgG antibodies against Plasmodium vivax antigens in a multiplexed bead-based assay using Luminex technology (Bio-Plex 200 or MAGPIX)2020

    • Author(s)
      Mazhari Ramin、Brewster Jessica、Fong Rich、Bourke Caitlin、Liu Zoe S. J.、Takashima Eizo、Tsuboi Takafumi、Tham Wai-Hong、Harbers Matthias、Chitnis Chetan、Healer Julie、Ome-Kaius Maria、Sattabongkot Jetsumon、Kazura James、Robinson Leanne J.、King Christopher、Mueller Ivo、Longley Rhea J.
    • Journal Title

      PLOS ONE

      Volume: 15 Issue: 12 Pages: e0238010-e0238010

    • DOI

      10.1371/journal.pone.0238010

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The N-Terminal Region of Plasmodium falciparum MSP10 Is a Target of Protective Antibodies in Malaria and Is Important for PfGAMA/PfMSP10 Interaction2019

    • Author(s)
      Nagaoka Hikaru、Kanoi Bernard N.、Jinoka Kana、Morita Masayuki、Arumugam Thangavelu U.、Palacpac Nirianne M. Q.、Egwang Thomas G.、Horii Toshihiro、Tsuboi Takafumi、Takashima Eizo
    • Journal Title

      Frontiers in Immunology

      Volume: 10 Pages: 2669-2669

    • DOI

      10.3389/fimmu.2019.02669

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] PfMSA180 is a novel Plasmodium falciparum vaccine antigen that interacts with human erythrocyte integrin associated protein (CD47)2019

    • Author(s)
      Nagaoka Hikaru、Sasaoka Chisa、Yuguchi Takaaki、Kanoi Bernard N.、Ito Daisuke、Morita Masayuki、Udomsangpetch Rachanee、Sattabongkot Jetsumon、Ishino Tomoko、Tsuboi Takafumi、Takashima Eizo
    • Journal Title

      Scientific Reports

      Volume: 9 Issue: 1 Pages: 5923-5923

    • DOI

      10.1038/s41598-019-42366-9

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 熱帯熱マラリア原虫 MSP10の赤血球侵入におけるメカニズムの解明2020

    • Author(s)
      長岡ひかる、カノイ バーナード、神岡花奈、森田将之、ニリアン パラクパック、堀井俊宏、坪井敬文、高島英造
    • Organizer
      第89回日本寄生虫学会大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 熱帯熱マラリア発症阻止に関連する感染赤血球表面抗原のゲノム網羅的免疫スクリーニング2020

    • Author(s)
      高島英造、カノイ バーナード、長岡ひかる、パラックパック ニリアン、堀井俊宏、坪井敬文
    • Organizer
      第89回日本寄生虫学会大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 三日熱マラリアヒプノゾイト保有者の血清診断マーカーの開発と検証2020

    • Author(s)
      坪井敬文、高島英造、森田将之、 Longley Rhea、 White Michael、Harbes Matthias、 Ding Xavier、 Mueller Ivo
    • Organizer
      第89回日本寄生虫学会大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 愛媛発イノベーションによるマラリアワクチン開発への貢献2020

    • Author(s)
      坪井敬文
    • Organizer
      日本学術会議中国・四国地区会議主催学術講演会
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] 新規マラリアワクチン候補GAMAに対する侵入阻害抗体の作製2020

    • Author(s)
      曾我郁弥、徳永聡、小澤龍彦、長岡ひかる、高島英造、岸裕幸、村口篤、坪井敬文、 澤崎達也
    • Organizer
      第61回 日本生化学会中国・四国支部例会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Post-genome unbiased strategies for discovery of malaria vaccine candidates by innovative wheat germ cell-free technology2019

    • Author(s)
      Takafumi Tsuboi
    • Organizer
      Malaria Vaccines for The World 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Screening for background immunity to P. vivax malaria in volunteers2019

    • Author(s)
      Eizo Takashima and Takafumi Tsuboi
    • Organizer
      MIST (Malaria Infection Study in Thailand) Kick-off Meeting
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Discovery of malaria vaccine candidates by innovative wheat germ cell-free technology2019

    • Author(s)
      Takafumi Tsuboi
    • Organizer
      U.S.-Japan Cooperative Medical Sciences Program (USJCMSP), and 21st International Conference on Emerging Infectious Diseases (EID) in the Pacific Rim
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Remarks] 愛媛大学プロテオサイエンスセンター

    • URL

      http://www.pros.ehime-u.ac.jp

    • Related Report
      2020 Annual Research Report
  • [Remarks] 愛媛大学・プロテオサイエンスセンター・マラリア研究部門

    • URL

      http://www.pros.ehime-u.ac.jp/malaria/

    • Related Report
      2019 Research-status Report

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Published: 2019-07-04   Modified: 2022-01-27  

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