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Evo-devo approach on the sex differentiation mechanism in volvocine algae to reconstruct the emergence of oogamy

Research Project

Project/Area Number 20K06766
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 45020:Evolutionary biology-related
Research InstitutionChuo University

Principal Investigator

HAMAJI Takashi  中央大学, 研究開発機構, 専任研究員 (10784556)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords性分化 / クラミドモナス / ボルボックス / 転写因子 / RWP-RKドメイン / 有性生殖 / 性決定 / 進化発生学 / 緑藻 / 雌雄性 / ゲノム編集
Outline of Research at the Start

雌雄二極化の鍵である「ボルボックス系列緑藻性決定因子MIDの有無がどのように、どの遺伝子を発現誘導/抑制することで性分化を生じるのか」というコア分子基盤動態は、未だ未解明である。同型配偶クラミドモナスの性分化制御機構と被制御遺伝子群全体を包括する性分化分子機構を明らかにし、同型配偶・異型配偶・卵生殖がすべて近縁な系統群に現存するすべてボルボックス系列緑藻全体で既に得られている比較ゲノム学的資源を直ちに応用して機能実証を試みることにより、ついに精子と卵の二極化をもたらした分子基盤が解明できると考えた。

Outline of Final Research Achievements

The emergence of oogamy is one of the major issues in evolutionary biology. Both metazoans, including humans, and terrestrial plants, which account for a large biomass on earth, are producing sperms and eggs with marked differences in the motility and size. It is generally believed that heterogametes and oogamy evolved from isomorphic gametes. Based on the background of the evolutionary history of sexual reproduction in the Volvox lineage of green algae, which is the only extant species among all eukaryotic lineages including isogamy and oogamy in it, the process by which derivative heterogametes emerged from ancestral-type isomorphic gametes, the entire gene regulatory network involved in the mechanism of sexual differentiation in Chlamydomonas and Volvox was investigated.

Academic Significance and Societal Importance of the Research Achievements

同型配偶クラミドモナスにおいて1994年に性決定領域ならびに1997年にマイナス・オス性決定転写因子MIDが同定されて以来じつに30年近い年月にわたり一切不明であった、ボルボックス系列緑藻の性決定にかかわる遺伝子制御の分子基盤の実体が本VSR1の発見によりついに解明されたと信ずる。この結果はむしろ今後、どのような遺伝子群の発現が「性の実質」であるかを明らかにするためのスタートラインに立つものとして位置づけうるだろう。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (10 results)

All 2022 2021 2020 Other

All Int'l Joint Research (3 results) Journal Article (4 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 4 results,  Open Access: 4 results) Presentation (3 results) (of which Int'l Joint Research: 1 results)

  • [Int'l Joint Research] ドナルド・ダンフォース植物科学センター(米国)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] ドナルド・ダンフォース植物科学センター(米国)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] ドナルド・ダンフォース植物科学センター(米国)

    • Related Report
      2020 Research-status Report
  • [Journal Article] HBD1 protein with a tandem repeat of two HMG-box domains is a DNA clip to organize chloroplast nucleoids in <i>Chlamydomonas reinhardtii</i>2021

    • Author(s)
      Takusagawa Mari、Kobayashi Yusuke、Fukao Yoichiro、Hidaka Kumi、Endo Masayuki、Sugiyama Hiroshi、Hamaji Takashi、Kato Yoshinobu、Miyakawa Isamu、Misumi Osami、Shikanai Toshiharu、Nishimura Yoshiki
    • Journal Title

      Proceedings of the National Academy of Sciences

      Volume: 118 Issue: 20 Pages: 463-475

    • DOI

      10.1073/pnas.2021053118

    • NAID

      120007035840

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Three genomes in the algal genus Volvox reveal the fate of a haploid sex-determining region after a transition to homothallism2021

    • Author(s)
      Kayoko Yamamoto, Takashi Hamaji, Hiroko Kawai-Toyooka, Ryo Matsuzaki, Fumio Takahashi, Yoshiki Nishimura, Masanobu Kawachi, Hideki Noguchi, Yohei Minakuchi, James G. Umen, Atsushi Toyoda, Hisayoshi Nozaki
    • Journal Title

      The Proceedings of the National Academy of Sciences

      Volume: 118 Issue: 21

    • DOI

      10.1073/pnas.2100712118

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Three sex phenotypes in a haploid algal species give insights into the evolutionary transition to a self-compatible mating system2021

    • Author(s)
      Kohei Takahashi, Hiroko Kawai-Toyooka, Ryo Ootsuki, Takashi Hamaji, Yuki Tsuchikane, Hiroyuki Sekimoto, Tetsuya Higashiyama, Hisayoshi Nozaki
    • Journal Title

      Evolution

      Volume: 75 Issue: 11 Pages: 2984-2993

    • DOI

      10.1111/evo.14306

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Holliday Junction Resolvase MOC1 Maintains Plastid and Mitochondrial Genome Integrity in Algae and Bryophytes2020

    • Author(s)
      Kobayashi Yusuke、Odahara Masaki、Sekine Yasuhiko、Hamaji Takashi、Fujiwara Sumire、Nishimura Yoshiki、Miyagishima Shin-ya
    • Journal Title

      Plant Physiology

      Volume: 184 Issue: 4 Pages: 1870-1883

    • DOI

      10.1104/pp.20.00763

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] A conserved RWP-RK transcription factor VSR1 controls gametic differentiation in volvocine algae2022

    • Author(s)
      Sa Geng, Takashi Hamaji, Patrick J. Ferris, Minglu Gao, Yoshiki Nishimura, James G. Umen
    • Organizer
      International Volvox Conference 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 陸上植物系統において真核生物型DNAリガーゼIが葉緑体局在を獲得した分子基盤2020

    • Author(s)
      浜地貴志, 小林優介, 山岡尚平, 鹿内利治, 西村芳樹
    • Organizer
      日本植物学会第84回大会(オンライン)
    • Related Report
      2020 Research-status Report
  • [Presentation] 3つの性表現型を持つ緑藻ボルボックス系列Pleodorina starriiの性決定機構の解析2020

    • Author(s)
      高橋昂平, 豊岡博子, 大槻涼, 浜地貴志, 東山哲也, 野崎久義
    • Organizer
      日本植物学会第84回大会(オンライン)
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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