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Molecular mechanism of piRNA biogenesis and nuage formation involving Tudor domain proteins

Research Project

Project/Area Number 21H02401
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 43010:Molecular biology-related
Research InstitutionOsaka University

Principal Investigator

KAI Toshie  大阪大学, 大学院生命機能研究科, 教授 (40579786)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
Fiscal Year 2023: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2022: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000)
Fiscal Year 2021: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
Keywords生殖細胞 / 小分子RNA / piRNA
Outline of Research at the Start

染色体の欠損や転座、挿入変異等によってゲノム情報を破壊する転移因子・トランスポゾンは、piRNAと呼ばれる小分子RNAによって抑制されている。piRNA前駆体から成熟piRNAへのプロセシングは多くの蛋白質が関与する複雑なプロセスであり、酵素活性をもつ因子の解析は進んでいるが、酵素活性を制御、または連携させる機構については不明な点が多い。生殖細胞でのpiRNA産生は、核膜近傍の細胞質側に存在するヌアージュという非膜系構造体で起こる。本提案では、ヌアージュでのpiRNAプロセシングに関与するTudorドメイン蛋白質(Tdrd)群の分子機能を解析し、piRNA生合成経路の包括的解明を目指す。

Outline of Final Research Achievements

In this study, we conducted functional analysis of Tudor domain proteins, which localize to the non-membranous organelle. We found that dTdrd1 functions to reinforce the piRNA pathway. Additionally, we demonstrated that the RNA helicase Tdrd9, which also localizes to the nuage, interacts with Tdrd5, promoting the ping-pong amplification cycle through the formation of the nuage and the recruitment of piRNA precursors to it. Furthermore, we identified a new type of piRNAs derived from protein-coding RNA sequences that are specifically expressed in testes, and elucidated its role in controlling the expression of genes involved in spermatogenesis.

Academic Significance and Societal Importance of the Research Achievements

piRNA経路は、生殖細胞のゲノムの安定化によって任性を保証する、動物にとって必要不可欠な生理学的プロセスの1つである。本研究によってもたらされた、その分子機構は、ゲノム安定化の分子機構の全容解明に大きく貢献するものである。無精子症や不妊症の患者には、申請者らの研究によってヌアージュ形成の核となることが明らかとなったTdrd9を含む既知のヌアージュ因子の変異が近年頻繁に報告されており、患者数は増えつつある。本研究によって明らかとなったpiRNAの生合成機構は、生殖医学に重要な知見をもたらし、不妊症疾患の新たな原因や治療法の開発の糸口を提供できると考えられる。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • Research Products

    (14 results)

All 2023 2022 2021 Other

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 4 results) Presentation (8 results) (of which Int'l Joint Research: 5 results,  Invited: 1 results) Remarks (2 results)

  • [Journal Article] Nondomain biopolymers: Flexible molecular strategies to acquire biological functions2023

    • Author(s)
      Arakawa K, Hirose T, Inada T, Ito T, Kai T, Oyama M, Tomari Y, Yoda T, Nakagawa S.
    • Journal Title

      Genes to Cells

      Volume: 28 Issue: 8 Pages: 539-552

    • DOI

      10.1111/gtc.13050

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] miRNA/siRNA-directed pathway to produce noncoding piRNAs from endogenous protein-coding regions ensures <i>Drosophila</i> spermatogenesis2023

    • Author(s)
      Iki Taichiro、Kawaguchi Shinichi、Kai Toshie
    • Journal Title

      Science Advances

      Volume: 9 Issue: 29 Pages: 1-15

    • DOI

      10.1126/sciadv.adh0397

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Tejas functions as a core component in nuage assembly and precursor processing in Drosophila piRNA biogenesis2023

    • Author(s)
      Yuxuan Lin, Ritsuko Suyama, Shinichi Kawaguchi, Taichiro Iki, Toshie Kai
    • Journal Title

      Journal of Cell Biology

      Volume: 222(10) Issue: 10

    • DOI

      10.1083/jcb.202303125

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] The Tudor Domain-Containing Protein, Kotsubu (CG9925), Localizes to the Nuage and Functions in piRNA Biogenesis in D. melanogasterr2022

    • Author(s)
      Lin-Xenia Lim, Wakana Isshiki, Taichiro Iki, Shinichi Kawaguchi, Toshie Kai
    • Journal Title

      Frontiers in Molecular Biosciences

      Volume: 9 Pages: 818302-818302

    • DOI

      10.3389/fmolb.2022.818302

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] 生殖細胞特異的な皮膜オルガネラ・ヌアージュの構造と機能2023

    • Author(s)
      甲斐歳恵
    • Organizer
      第33回フォーラム・イン・ドージン
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Discovering novel factors in piRNA pathway by proximity proteome screening in Drosophila melanogaster2023

    • Author(s)
      一色和奏
    • Organizer
      第1回細胞生物コロキウム
    • Related Report
      2023 Annual Research Report
  • [Presentation] BioID法によるpiRNA経路新規因子の探索と同定2023

    • Author(s)
      一色和奏
    • Organizer
      第46回日本分子生物学会年会
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Proximity-dependent Proteome Reveals Physical and Functional Cyclophilin 40-client Interactions in Drosophila Spermatogenesis2022

    • Author(s)
      井木太一郎
    • Organizer
      The 10th International Conference on The Hsp90 Chaperone Machine
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A Pathway to Produce piRNAs from Endogenous Protein-coding Sequences Supports Drosophila Spermatogenesis2022

    • Author(s)
      井木太一郎
    • Organizer
      第23回日本RNA学会年会
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] piRNAによるゲノムの安定化機構2022

    • Author(s)
      LIM LIN XENIA
    • Organizer
      第45回日本分子生物学会年会
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] ショウジョウバエ卵巣でのpiRNA経路に関わる新規因子のBioID法による同定2022

    • Author(s)
      一色和奏
    • Organizer
      第45回日本分子生物学会年会
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] ショウジョウバエにおけるTejasとSpn-EによるpiRNA生合成のためのヌアージュ構築の分子基盤2021

    • Author(s)
      Lin Yuxuan, Kawaguchi Shinichi, Iki Taichiro, Suyama Ritsuko, Kai Toshie
    • Organizer
      第44回分子生物学会年会
    • Related Report
      2021 Annual Research Report
  • [Remarks] 生殖ゲノムを守る「雲(ヌアージュ)」を形成する機構を解明

    • URL

      https://www.fbs.osaka-u.ac.jp/ja/research_results/papers/detail/1069

    • Related Report
      2023 Annual Research Report
  • [Remarks] タンパク質をコードする情報を「非コード化」させる生命現象の発見

    • URL

      https://www.fbs.osaka-u.ac.jp/ja/research_results/papers/detail/1066

    • Related Report
      2023 Annual Research Report

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Published: 2021-04-28   Modified: 2025-01-30  

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