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A study of mechanisms of monospermy by electrical block to polyspermy

Research Project

Project/Area Number 19K06690
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 44020:Developmental biology-related
Research InstitutionYamaguchi University

Principal Investigator

Iwao Yasuhiro  山口大学, その他部局等, 名誉教授 (10144916)

Co-Investigator(Kenkyū-buntansha) 上野 秀一  山口大学, 大学院創成科学研究科, 准教授 (80363092)
Project Period (FY) 2019-04-01 – 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: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2021: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords多精拒否 / 多精防止 / 受精 / 発生開始 / 両生類 / 二倍体
Outline of Research at the Start

受精は有性生殖に必須の機構であり、卵と精子の特異的な膜接着・融合が必要である。本研究では、脊椎動物での雌雄の2倍体ゲノムによる単精発生を保証するしくみ:多精拒否の分子機構を明らかにする。単精受精における電気的な膜接着・融合の制御機構の分子メカニズムを精子上で膜電位センサーのMatrix metalloproteinase-2 (MMP-2)を欠失した精子を用いて解明する。MMP-2と結合する卵側リセプター分子および卵と精子の膜融合活性分子を明らかにする。これらにより、脊椎動物の受精成立に必要な普遍的な分子を明らかにし、受精機構の進化を解明する。

Outline of Final Research Achievements

Fertilization is essential for sexual reproduction in all animals. The eggs of most vertebrates accept only one sperm to eliminate the extra sperm outside the egg. The egg has a mechanism that prevents polyspermy at the time of fertilization, ensuring monospermic development. In this study, we elucidated the molecular mechanism of monospermic fertilization controlled by positive fertilization potential using amphibians, which are easy to experiment in fertilization. When the first sperm fertilizes and enters the egg, the egg’s membrane potential becomes positive (fertilization potential). A positive fertilization potential prevents membrane fusion with the subsequent sperm, preventing entry of multiple sperm into the fertilized egg. We have proved with matrix metalloproteinase-2 (MMP-2) deficient sperm that positively charged MMP-2 is distributed on the sperm membrane and is essential for the polyspermy block as a sensor for detecting the positive fertilization potential.

Academic Significance and Societal Importance of the Research Achievements

受精はすべての動物の有性生殖に必須であり、次世代個体の維持とともに進化における種分化に重要な役割をもっている。今回の研究では、脊椎動物での受精機構のモデルである両生類を用いて早い電気的多精拒否の分子メカニズムを明らかにした。これは動物界全般に共通な受精における普遍的な機能分子の解明に繋がると考えられる。さらに今後、ヒトを含む哺乳類における受精機構の解明や不妊治療の開発等での基盤研究に貢献することが期待される。

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (15 results)

All 2022 2021 2020 2019 Other

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (10 results) (of which Invited: 1 results) Book (1 results) Remarks (1 results)

  • [Journal Article] SPERM FACTORS AND EGG ACTIVATION: Divergent sperm factors for egg activation in amphibian fertilization2022

    • Author(s)
      Yasuhiro Iwao and Shuichi Ueno
    • Journal Title

      Reproduction

      Volume: 164(1) Issue: 1 Pages: F29-F37

    • DOI

      10.1530/rep-21-0480

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Sperm MMP-2 is indispensable for fast electrical block to polyspermy at fertilization in Xenopus tropicalis2021

    • Author(s)
      Mami Watabe, Azusa Hiraiwa, Mami Sakai, Tomoyo Ueno, Shuichi Ueno, Keisuke Nakajima, Yoshio Yaoita, Yasuhiro Iwao
    • Journal Title

      Molecular Reproduction and Development

      Volume: 88 Issue: 11 Pages: 744-757

    • DOI

      10.1002/mrd.23540

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Physiological polyspermy: Selection of a sperm nucleus for the development of diploid genomes in amphibians2020

    • Author(s)
      Iwao Y, Kimoto C, Fujimoto A, Suda A, Hara Y
    • Journal Title

      Molecular Reproduciton & Development

      Volume: 87 Issue: 3 Pages: 358-369

    • DOI

      10.1002/mrd.23235

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] 両生類の卵活性化と多精拒否のメカニズム2022

    • Author(s)
      岩尾 康宏,上野 秀一
    • Organizer
      第93回日本動物学会早稲田大会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] ネッタイツメガエル受精における電位依存的な精子侵入のしくみ2021

    • Author(s)
      境 眞実・渡部茉美・中島圭介・矢尾板芳郎・岩尾康宏・上野秀一
    • Organizer
      日本動物学会第92回大会
    • Related Report
      2021 Research-status Report
  • [Presentation] ツメガエル受精における卵内 Ca2+ 濃度上昇および精子と卵の膜融合の解析2021

    • Author(s)
      越智洋登・上野秀一・岩尾康宏
    • Organizer
      日本動物学会第92回大会
    • Related Report
      2021 Research-status Report
  • [Presentation] ツメガエル交雑受精を用いた膜接着・融合のしくみの解明2021

    • Author(s)
      山下将平 ・岩尾康宏・上野秀一
    • Organizer
      日本動物学会第92回大会
    • Related Report
      2021 Research-status Report
  • [Presentation] ネッタイツメガエル受精における電位依存的な卵賦活と精子侵入のしくみ2021

    • Author(s)
      境 眞実・渡部茉美・中島圭介・矢尾板芳郎・岩尾康宏・上野秀一
    • Organizer
      日本分生生物学会第44回年会
    • Related Report
      2021 Research-status Report
  • [Presentation] ツメガエル受精における精子と卵の膜融合と卵内 Ca2+濃度上昇との関係2021

    • Author(s)
      越智洋登・上野秀一・岩尾康宏
    • Organizer
      日本分生生物学会第44回年会
    • Related Report
      2021 Research-status Report
  • [Presentation] ツメガエル交雑受精における Ca2+ 濃度上昇の役割の解明2021

    • Author(s)
      山下将平 ・岩尾康宏・上野秀一
    • Organizer
      日本分生生物学会第44回年会
    • Related Report
      2021 Research-status Report
  • [Presentation] 両生類の多精拒否機構2020

    • Author(s)
      岩尾康宏
    • Organizer
      第7回 生殖若手の会
    • Related Report
      2020 Research-status Report
  • [Presentation] 精子MMP-2 HPXはツメガエル受精での電気的多精拒否に必要である2019

    • Author(s)
      渡部茉美,平岩 梓,上野秀一,上野智代,中島圭介,矢尾板芳郎,岩尾康宏
    • Organizer
      日本動物学会第90回大阪大会
    • Related Report
      2019 Research-status Report
  • [Presentation] ツメガエル受精時の卵・精子接着/融合と卵内Ca2+濃度上昇の関係2019

    • Author(s)
      上野隆道, 渡部茉美, 岩尾康宏
    • Organizer
      第42回日本分子生物学会年会
    • Related Report
      2019 Research-status Report
  • [Book] Reproduction in Aquatic Animals From Vasic Biology to Aquaculture Technology2020

    • Author(s)
      Yasuhiro Iwao and Mami Watabe (M. Yoshida & J.F.Asturiano eds.)
    • Total Pages
      379
    • Publisher
      Springer Nature Singapore Pte Ltd.
    • ISBN
      9789811522901
    • Related Report
      2019 Research-status Report
  • [Remarks] 生殖発生生物学研究室

    • URL

      http://ds.cc.yamaguchi-u.ac.jp/~suenoscb/index.html

    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2024-01-30  

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