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Regulation of nuclear fusion by the LINC complex during sexual reproduction of Arabidopsis

Research Project

Project/Area Number 19K06704
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 44030:Plant molecular biology and physiology-related
Research InstitutionNiigata University

Principal Investigator

Nishikawa Shuh-ichi  新潟大学, 自然科学系, 教授 (10252222)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords核膜融合 / 雌性配偶体 / 重複受精 / シロイヌナズナ / 核膜タンパク質 / 細胞核融合 / 有性生殖 / 膜融合 / 膜タンパク質
Outline of Research at the Start

われわれは、シロイヌナズナの雌性配偶体を用いた遺伝子発現誘導系を開発し、これを用いた解析によって、核内膜のSUNタンパク質が雌性配偶体形成過程の極核融合に必要であることを明らかにした。SUNタンパク質は、核外膜のKASHタンパク質とともにLINC複合体を形成しているが、極核融合ではSUN-KASH相互作用が必要であることも示した。本研究では、植物の有性生殖の核融合におけるLINC複合体の役割の解明を目指す。このため、1)極核融合過程で機能するKASHタンパク質の同定と機能解析、2)精核融合過程におけるLINC複合体の役割の解析、3)極核移動過程におけるアクチン細胞骨格系の役割の解析、を行う。

Outline of Final Research Achievements

The LINC complex is a protein complex formed by the SUN protein in the inner nuclear membrane and the KASH protein in the outer nuclear membrane. The LINC complex functions in various processes including nuclear migration and positioning. In this study, we improved our female gametophyte-specific gene induction system. Using the improved system, we analyzed the roles of the LINC complex in nuclear fusion (polar nuclear fusion and sperm nuclear fusion) during sexual reproduction in Arabidopsis thaliana. Our results suggested that the SUN protein is required for polar nuclear fusion but not for sperm nuclear fusion. We identified a KASH protein expressed in the female gametophyte and analyzed its functions in nuclear fusion. We also analyzed the functional domains GEX1, a nuclear membrane protein required for nuclear membrane fusion.

Academic Significance and Societal Importance of the Research Achievements

本研究で作製した改良型の雌性配偶体特異的な遺伝子発現誘導系は、雌性配偶体形成初期過程からの遺伝子機能の解析を含め、利用可能な範囲が広がったといえる。また、極核融合と精核融合のメカニズムの違いを示唆する結果は、2種類の核融合を区別する機構の探索への展開が期待できる。本研究によって特定したKASHタンパク質やGEX1を足がかりとした解析によって、有性生殖過程の核膜融合の分子機構の理解が進むと考えられる。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (16 results)

All 2022 2021 2020 2019 Other

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 4 results) Presentation (10 results) (of which Int'l Joint Research: 1 results,  Invited: 3 results) Remarks (2 results)

  • [Journal Article] Arabidopsis GEX1 Is a Nuclear Membrane Protein of Gametes Required for Nuclear Fusion During Reproduction2020

    • Author(s)
      Nishikawa Shuh-ichi、Yamaguchi Yuki、Suzuki Chiharu、Yabe Ayaka、Sato Yuzuru、Kurihara Daisuke、Sato Yoshikatsu、Susaki Daichi、Higashiyama Tetsuya、Maruyama Daisuke
    • Journal Title

      Frontiers in Plant Science

      Volume: 11 Pages: 548032-548032

    • DOI

      10.3389/fpls.2020.548032

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] ERdj3B-mediated quality control maintains anther development at high temperatures2020

    • Author(s)
      Yamamoto Masaya、Uji Shuhei、Sugiyama Tomoyuki、Sakamoto Tomoaki、Kimura Seisuke、Endo Toshiya、Nishikawa Shuh-ichi
    • Journal Title

      Plant Physiology

      Volume: - Issue: 4 Pages: 1979-1990

    • DOI

      10.1104/pp.19.01356

    • Related Report
      2020 Research-status Report 2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Development of a Heat-Inducible Gene Expression System Using Female Gametophytes of Arabidopsis thaliana2019

    • Author(s)
      Hwang Dukhyun、Wada Satomi、Takahashi Azusa、Urawa Hiroko、Kamei Yasuhiro、Nishikawa Shuh-ichi
    • Journal Title

      Plant and Cell Physiology

      Volume: 60 Issue: 11 Pages: 2564-2572

    • DOI

      10.1093/pcp/pcz148

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Fertilization-Coupled Sperm Nuclear Fusion Is Required for Normal Endosperm Nuclear Proliferation2019

    • Author(s)
      Maruyama Daisuke、Higashiyama Tetsuya、Endo Toshiya、Nishikawa Shuh-ichi
    • Journal Title

      Plant and Cell Physiology

      Volume: 61 Issue: 1 Pages: 29-40

    • DOI

      10.1093/pcp/pcz158

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 核膜融合タンパク質シロイヌナズナGEX1の機能領域の解析2022

    • Author(s)
      加藤イヴ、宮園治、西川周一
    • Organizer
      第63回日本植物生理学会年会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 有性生殖過程の核融合を阻害する化合物の探索と解析2021

    • Author(s)
      小林那奈美、斎藤圭吾、佐藤綾人、伊丹健一郎、西川周一
    • Organizer
      新潟生化学懇話会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 核融合因子GEX1の陸上植物ホモログの機能解析2021

    • Author(s)
      西川周一、矢部あやか
    • Organizer
      日本植物学会第85回大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 植物有性生殖過程の核膜融合の分子機構2021

    • Author(s)
      西川周一
    • Organizer
      第44回日本分子生物学会年会
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] 有性生殖過程の核融合を阻害する化合物の探索2020

    • Author(s)
      小林那奈美
    • Organizer
      日本植物学会第84回大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 核膜融合因子GEX1の被子植物ホモログの機能解析2020

    • Author(s)
      矢部あやか
    • Organizer
      北陸植物学会2020年度大会
    • Related Report
      2020 Research-status Report
  • [Presentation] シロイヌナズナ核融合欠損株で観察される受精後の胚発生異常の解析2020

    • Author(s)
      西川周一
    • Organizer
      第62回日本植物生理学会年会
    • Related Report
      2020 Research-status Report
  • [Presentation] Proteins involved in nuclear membrane fusion in plant reproduction.2019

    • Author(s)
      Shuh-ichi Nishikawa
    • Organizer
      第19回日本蛋白質科学会年会・第71回日本細胞生物学会大会
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] シロイヌナズナ新規核膜融合因子Gex1の細胞内動態の解析2019

    • Author(s)
      西川周一
    • Organizer
      日本植物学会第83回大会
    • Related Report
      2019 Research-status Report
  • [Presentation] Machineries of nuclear membrane fusion during plant reproduction2019

    • Author(s)
      Shuh-ichi Nishikawa
    • Organizer
      Marchantia Workshop 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Remarks] 生殖過程の核融合の鍵となる、進化的に保存された核膜タンパク質を同定しました

    • URL

      https://www.niigata-u.ac.jp/news/2020/78597/

    • Related Report
      2020 Research-status Report
  • [Remarks] 植物の配偶体を用いた新たな遺伝子機能解析系を開発しました

    • URL

      https://www.niigata-u.ac.jp/news/2019/59352/

    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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