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Study on the female specific regulation of meiosis

Research Project

Project/Area Number 22K19315
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 44:Biology at cellular to organismal levels, and related fields
Research InstitutionKumamoto University

Principal Investigator

Ishiguro Kei-ichiro  熊本大学, 発生医学研究所, 教授 (30508114)

Project Period (FY) 2022-06-30 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2023: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2022: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywords減数分裂 / 卵子 / 不妊 / 卵
Outline of Research at the Start

減数分裂の制御には雌雄性差がある。オス精巣では生涯にわたって減数分裂が継続されるが、メスの減数分裂は胎児期のごく狭いタイムスパンの一時期に開始され、いったん長期の休眠状態に入る。ヒトの場合は数十年以上にもわたって休眠状態が持続され、排卵と同時に第一分裂が再開される。本研究では卵子の休眠に関わる遺伝子の実態を明らかにする。

Outline of Final Research Achievements

In this study, we examined gene expression in female oocytes at the onset of meiosis using scRNA-seq analysis. Mutant Stra8 mice, in which Stra8-RB interaction is lost, were generated. Mutant Stra8-expressing mice showed a delay in progression to meiosis due to loss of interaction with RBs. Furthermore, the ovaries of mutant Stra8 mice showed an early reduction in the number of primordial follicles immediately after birth, indicating that the oocytes were unable to maintain the dormant state and were eliminated around birth. Thus, it is suggested that the interaction between STAR8 and RB acts in female-specific meiosis initiation, and that the delay at the onset of meiosis also affects later oocyte development.

Academic Significance and Societal Importance of the Research Achievements

ヒトに見られる不妊症は原因が不明とされる症例が多いことが知られている。女性の場合、妊娠中の母親の母体内で胎児の時期に、減数分裂が開始された生殖細胞の数によって、将来大人になったときの卵子の貯蔵数が決定される。すなわち、女性は生まれる前には、減数分裂が開始されて生涯にわたる卵子が準備されていることになる。本研究は、原発性卵巣不全や早発性閉経など卵子の形成不全や早期枯渇を示す不妊症の病態の解明に資することが期待される。また妊娠期に癌抑制タンパク質RBに影響を与える可能性のある投薬や、創薬での指針となる可能性がある。

Report

(2 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • Research Products

    (17 results)

All 2024 2023 Other

All Int'l Joint Research (1 results) Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 3 results,  Open Access: 3 results) Presentation (9 results) (of which Int'l Joint Research: 3 results,  Invited: 7 results) Book (2 results) Remarks (2 results)

  • [Int'l Joint Research] UC Davis(米国)

    • Related Report
      2023 Annual Research Report
  • [Journal Article] ATF7IP2/MCAF2 directs H3K9 methylation and meiotic gene regulation in the male germline2024

    • Author(s)
      Alavattam Kris G.、Esparza Jasmine M.、Hu Mengwen、Shimada Ryuki、Kohrs Anna R.、Abe Hironori、Munakata Yasuhisa、Otsuka Kai、Yoshimura Saori、Kitamura Yuka、Yeh Yu-Han、Hu Yueh-Chiang、Kim Jihye、Andreassen Paul R.、Ishiguro Kei-ichiro、Namekawa Satoshi H.
    • Journal Title

      Genes & Development

      Volume: 38 Issue: 3-4 Pages: 115-130

    • DOI

      10.1101/gad.351569.124

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] ZSCAN4-binding motif TGCACAC is conserved and enriched in CA/TG microsatellites in both mouse and human genomes2023

    • Author(s)
      Akiyama Tomohiko、Ishiguro Kei-ichiro、Chikazawa Nana、Ko Shigeru B H、Yukawa Masashi、Ko Minoru S H
    • Journal Title

      DNA Research

      Volume: 31 Issue: 1

    • DOI

      10.1093/dnares/dsad029

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] STRA8-RB interaction is required for timely entry of meiosis in mouse female germ cells2023

    • Author(s)
      Shimada Ryuki、Kato Yuzuru、Takeda Naoki、Fujimura Sayoko、Yasunaga Kei-ichiro、Usuki Shingo、Niwa Hitoshi、Araki Kimi、Ishiguro Kei-ichiro
    • Journal Title

      Nature Communications

      Volume: 14 Issue: 1 Pages: 6443-6443

    • DOI

      10.1038/s41467-023-42259-6

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 減数分裂の開始機構の雌雄性差2024

    • Author(s)
      石黒啓一郎
    • Organizer
      第 41 回染色体ワークショップ・第 22 回核ダイナミクス研究会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Sexually different mechanism of meiosis initiation in mouse germ cells2023

    • Author(s)
      Kei-ichiro Ishiguro
    • Organizer
      Spermatogenesis Conference
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Sexually different mechanism of meiosis initiation in mouse germ cells2023

    • Author(s)
      Kei-ichiro Ishiguro
    • Organizer
      Symposium on Genome Stability and organization
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] The sexually different mechanism of meiosis initiation in mouse germ cells2023

    • Author(s)
      Kei-ichiro Ishiguro
    • Organizer
      The 9th International Symposium on the Biology of Vertebrate Sex Determination
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 減数分裂の開始機構2023

    • Author(s)
      石黒啓一郎
    • Organizer
      2023年度繁殖生物学会大会シンポジウム
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 減数分裂の開始機構の雌雄性差2023

    • Author(s)
      石黒啓一郎
    • Organizer
      日本遺伝学会第95回大会(熊本)
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] マウス生殖細胞における減数分裂開始タンパク質の同定2023

    • Author(s)
      石黒啓一郎
    • Organizer
      日本プロテオーム学会2023年大会 (新潟)
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 減数分裂のpre-meiotic S期からの開始機構2023

    • Author(s)
      石黒啓一郎
    • Organizer
      国立遺伝学研究所 染色体安定維持研究会
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 減数分裂の開始様式における雌雄性差のメカニズム2023

    • Author(s)
      石黒啓一郎
    • Organizer
      第64回日本卵子学会 (つくば)
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Book] 実験医学2024年2月号 「不妊の原因解明に挑む生殖細胞研究」2024

    • Author(s)
      石黒啓一郎
    • Total Pages
      5
    • Publisher
      羊土社
    • Related Report
      2023 Annual Research Report
  • [Book] 実験医学2024年2月号 減数分裂開始の制御機構とその雌雄性差2024

    • Author(s)
      島田龍輝, 石黒啓一郎
    • Total Pages
      9
    • Publisher
      羊土社
    • Related Report
      2023 Annual Research Report
  • [Remarks] 熊本大学発生医学研究所 染色体制御分野

    • URL

      https://www.imeg.kumamoto-u.ac.jp/bunya_top/chromosome-biology/ronbun/

    • Related Report
      2023 Annual Research Report
  • [Remarks] Research map

    • URL

      https://researchmap.jp/read0123107/

    • Related Report
      2023 Annual Research Report

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Published: 2022-07-05   Modified: 2025-01-30  

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