• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Underlying mechanism of germline sex determination by FOXL3 and its co-factors

Research Project

Project/Area Number 19K23749
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0702:Biology at cellular to organismal levels, and related fields
Research InstitutionNagoya University

Principal Investigator

Kikuchi Mariko  名古屋大学, 理学研究科, 助教 (20845135)

Project Period (FY) 2019-08-30 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords生殖細胞 / 性決定 / 卵形成 / メダカ / FOXL3 / FBXO47 / コヒーシン / 減数分裂の性差 / foxl3 / 性 / IP-MS
Outline of Research at the Start

生殖細胞の性決定(卵になるか精子になるかの運命決定)のスイッチ因子としてメダカで同定された転写因子FOXL3は、その下流でゲノム高次構造の性的二型を構築し、性特異的な遺伝子発現を制御している可能性が示唆されている。本研究では、免疫沈降-質量分析法を用いてFOXL3の共因子を網羅的に探索し、FOXL3が生殖細胞の性を司る分子メカニズムを解明することを目的としている。

Outline of Final Research Achievements

Using CRISPR/Cas9 system, I generated medaka mutant lines of fbxo47 and rec8a, direct targets of FOXL3. fbxo47-mutant females were sterile, while males were fertile. The mutant ovaries lacked follicles, and chromosome in germ cells exhibited ring-like morphology possibly caused by telomere fusion. Furthermore, the fbxo47-mutant germ cells committed into spermatogenesis, suggesting that FBXO47 has a role in suppression of spermatogenesis. rec8a-mutant females were also sterile, and progression of meiosis was severely defected in germ cells. These results firstly revealed the molecular pathways that initiates several events in female germ cells (e.g. folliculogenesis, suppression of spermatogenesis, and meiosis progression).

Academic Significance and Societal Importance of the Research Achievements

REC8AとFBXO47はそれぞれ染色体の高次構造とタンパク質分解に関わる因子であり、これらの事象と生殖細胞の性決定との関連が本研究で初めて示された。今後REC8AとFBXO47の機能を詳細に調べることで、生殖細胞の性を決める仕組みと卵を作り出す仕組みが分子レベルでより詳細に明らかになると考えられる。
そして卵や精子への経路を決める仕組みが明らかになれば、畜産・水産業において家畜や養殖魚の繁殖効率上昇や、生殖医療技術の改善につながると期待される。

Report

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

    (5 results)

All 2020 2019 Other

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

  • [Journal Article] foxl3, a sexual switch in germ cells, initiates two independent molecular pathways for commitment to oogenesis in medaka.2020

    • Author(s)
      Kikuchi, M., Nishimura, T., Ishishita, S., Matsuda, Y. and Tanaka, M. (in press)
    • Journal Title

      Proc. Natl. Acad. Sci. USA

      Volume: 117 Issue: 22 Pages: 12174-12181

    • DOI

      10.1073/pnas.1918556117

    • Related Report
      2020 Annual Research Report 2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 卵形成コミットメントの分子機構2019

    • Author(s)
      菊地真理子、西村俊哉、丹羽大樹、田中実
    • Organizer
      日本分子生物学会年会
    • Related Report
      2019 Research-status Report
  • [Remarks] 名古屋大学プレスリリース「卵を作り出す仕組みを発見~精子ではなく、卵になるということ。~」

    • URL

      https://www.nagoya-u.ac.jp/about-nu/public-relations/researchinfo/upload_images/20200515_sci1.pdf

    • Related Report
      2020 Annual Research Report
  • [Remarks] 名古屋大学理学研究科生命理学専攻 論文紹介

    • URL

      https://www.bio.nagoya-u.ac.jp/paper/2020-35/23.html

    • Related Report
      2020 Annual Research Report
  • [Remarks] 名古屋大学理学研究科生命理学専攻 生殖生物学グループ(田中研)website

    • URL

      http://www.medaka.bio.nagoya-u.ac.jp

    • Related Report
      2020 Annual Research Report

URL: 

Published: 2019-09-03   Modified: 2022-01-27  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi