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Posibilty of sympatric speciation of protists by cellular symbiosis

Research Project

Project/Area Number 17K19423
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Research Field Ecology and Evolution (including anthropology), and related fields
Research InstitutionTokyo Institute of Technology

Principal Investigator

Hongoh Yuichi  東京工業大学, 生命理工学院, 教授 (90392117)

Co-Investigator(Kenkyū-buntansha) 木原 久美子  熊本高等専門学校, 生物化学システム工学科, 准教授 (50622916)
Research Collaborator Fukuda Shinji  慶応大学, 政策メディア研究科, 特任教授
Sakai Miho  東京工業大学, 生命理工学院, 大学院生
Project Period (FY) 2017-06-30 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2018: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords共生 / 種分化 / 原生生物 / 腸内微生物 / メタン菌 / 難培養 / 細胞内共生 / 腸内細菌群集 / メタゲノム / 木質分解 / 昆虫 / 微生物
Outline of Final Research Achievements

This study aimed to test my hypothesis that single-celled eukaryotes (protists) can speciate by acquiring symbiotic prokaryotes. For this purpose, I selected a termite-gut protist genus as the material to be examined. Although the protist genus has been regarded monospecific, I demonstrated that it comprises two distinct species and that the two species can be discriminated by the presence or absence of endosymbiotic archaea. The genome analysis of the symbiotic archaeon indicated that the genome is very similar to its free-living relatives; the symbiosis has emerged relatively recently. Thus, this study strongly suggests that cellular symbiosis with prokaryotes can lead to speciation of a protist, though further studies are needed to prove this.

Academic Significance and Societal Importance of the Research Achievements

生物の「種」がどのように形成されたか、というのは生物学上の重要なテーマである。本研究課題では、新たな種分化過程の仮説を提唱し、該当する可能性のある事例を材料として検証した。その結果、単細胞真核生物である原生生物の場合、細胞内に原核生物(細菌と古細菌)が共生することで種分化を引き起こす可能性が強く示唆された。これは、多様な原生生物種の存在を(部分的に)説明する、進化学上の重要な成果である。

Report

(3 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • Research Products

    (16 results)

All 2018 Other

All Int'l Joint Research (2 results) Journal Article (5 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (8 results) (of which Int'l Joint Research: 6 results,  Invited: 5 results) Remarks (1 results)

  • [Int'l Joint Research] University of Sydney(オーストリア)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] シドニー大学(オーストラリア)

    • Related Report
      2017 Research-status Report
  • [Journal Article] Termite gut flagellates and their methanogenic and eubacterial symbionts2018

    • Author(s)
      Hongoh Y. and Ohkuma M
    • Journal Title

      Microbiology Monographs [(Endo)symbiotic Methanogenic Archaea (2nd Edition)]

      Volume: 19 Pages: 55-80

    • DOI

      10.1007/978-3-319-98836-8_5

    • ISBN
      9783319988351, 9783319988368
    • Related Report
      2018 Annual Research Report
  • [Journal Article] Genome analyses of uncultured TG2/ZB3 bacteria in ‘Margulisbacteria’ specifically attached to ectosymbiotic spirochetes of protists in the termite gut2018

    • Author(s)
      Utami Yuniar Devi、Kuwahara Hirokazu、Igai Katsura、Murakami Takumi、Sugaya Kaito、Morikawa Takahiro、Nagura Yuichi、Yuki Masahiro、Deevong Pinsurang、Inoue Tetsushi、Kihara Kumiko、Lo Nathan、Yamada Akinori、Ohkuma Moriya、Hongoh Yuichi
    • Journal Title

      The ISME Journal

      Volume: 13 Issue: 2 Pages: 455-467

    • DOI

      10.1038/s41396-018-0297-4

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Ectosymbiotic bacterial microbiota densely colonize the surface of thelastomatid nematodes in the gut of the wood-feeding cockroach Panesthia angustipennis2018

    • Author(s)
      Murakami Takumi、Onouchi Shu、Igai Katsura、Ohkuma Moriya、Hongoh Yuichi
    • Journal Title

      FEMS Microbiology Ecology

      Volume: 95 Issue: 2

    • DOI

      10.1093/femsec/fiy238

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Metagenomic analyses highlight the symbiotic association between the glacier stonefly Andiperla willinki and its bacterial gut community2018

    • Author(s)
      Murakami, T., Segawam T., Takeuchi, N., Barcaza, G., Lavarcam P., Kohshima, S., Hongoh, Y.
    • Journal Title

      Environmental Microbiology

      Volume: 20 Issue: 11 Pages: 4170-4183

    • DOI

      10.1111/1462-2920.14420

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] ゲノム解析によるシロアリ腸内原生生物共生細菌の役割の解明2018

    • Author(s)
      本郷裕一
    • Journal Title

      しろあり(公益社団法人日本しろあり対策協会 機関誌)

      Volume: 169 Pages: 12-26

    • NAID

      40021458992

    • Related Report
      2018 Annual Research Report
  • [Presentation] Genome analysis of a methanogenic endosymbiont of a novel Mixotricha protist species in the termite gut2018

    • Author(s)
      Miho Sakai, Katsura Igai, Takako Mabuchi, Hirokazu Kuwahara, Nathan Lo, Moriya Ohkuma, Kumiko Kihara, Yuichi Hongoh
    • Organizer
      The 17th International Symposium on Microbial Ecology (ISME17)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Genomics of uncultivable bacteria deciphers the multilayered symbiotic system in the termite gut2018

    • Author(s)
      Yuichi Hongoh
    • Organizer
      OIST seminar
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Multilayered-symbiotic system in the termite gut2018

    • Author(s)
      Yuichi Hongoh
    • Organizer
      Central China Normal University Semiar
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Genomics of uncultivable bacteria deciphers multilayered symbiotic system in the termite gut2018

    • Author(s)
      Yuichi Hongoh
    • Organizer
      2018 World Life Science Conference
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Multi-layered symbiotic system in the termite gut2018

    • Author(s)
      Yuichi Hongoh
    • Organizer
      第46回内藤カンファレンス
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Genomics of uncultivable bacteria deciphers multilayered symbiotic system in the termite gut2018

    • Author(s)
      Yuichi Hongoh
    • Organizer
      International Workshop on Insect Gut Microbiology, Max Planck Institute(Marburg)
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] シロアリ腸内原生生物細胞内に共生する未培養メタン菌のゲノム解析2018

    • Author(s)
      酒井海帆、猪飼桂、間渕貴子、木原久美子、桑原宏和、伊藤隆、Nathan Lo、大熊盛也、本郷裕一
    • Organizer
      第12回日本ゲノム微生物学会年会
    • Related Report
      2017 Research-status Report
  • [Presentation] Siingle-cell genomics deciphers the termite gut ecosystem2018

    • Author(s)
      本郷裕一
    • Organizer
      第91回日本細菌学会総会 国際シンポジウム
    • Related Report
      2017 Research-status Report
    • Invited
  • [Remarks] 本郷研ホームページ

    • URL

      http://www.hongoh.bio.titech.ac.jp

    • Related Report
      2018 Annual Research Report

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Published: 2017-07-21   Modified: 2020-03-30  

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