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Role of Polycomb in tethering ncRNAs to chromatin.

Research Project

Project/Area Number 21K19241
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 43:Biology at molecular to cellular levels, and related fields
Research InstitutionInstitute of Physical and Chemical Research

Principal Investigator

Masui Osamu  国立研究開発法人理化学研究所, 生命医科学研究センター, 研究員 (30579305)

Co-Investigator(Kenkyū-buntansha) 加藤 雅紀  国立研究開発法人理化学研究所, 生命医科学研究センター, 上級研究員 (10625437)
Project Period (FY) 2021-07-09 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2022: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2021: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
KeywordsXist RNA / エピジェネティクス / 遺伝子転写制御 / Non-coding RNA / RADICL-seq / Live-cell imaging / Xist / PRC1 / Degron / non-coding RNA / Polycomb
Outline of Research at the Start

予備実験の結果から、ポリコーム複合体PRC1を介してncRNAがクロマチンに繋留されることが示唆されており、本研究でその実証を試みる。まず野生型とPRC1欠失細胞を用いてRADICL-seqを実施し、PRC1依存的にクロマチンに結合するncRNA分子群の網羅的同定を行う。それらのncRNA分子に対して、RNA分子の細胞内での局在を可視化するRNA FISH法を用いることで、PRC1欠損時にそれらがどのように細胞内での局在を変化させるかを明らかにする。また、PRC1の各サブユニットやPRC1の下流に存在する分子を欠損させた細胞をRNA FISH解析することで、詳細なメカニズムの解明を行う。

Outline of Final Research Achievements

In this study, we first performed RADICL-seq analysis, which can identify RNA-DNA interactions in a genome-wide manner, and revealed that 50% of Xist RNA changed its binding from X chromosome to autosomes upon PRC1 deletion. This result is consistent with our previous results based on RNA FISH experiments, in which ~50% of cells showed a dispersed distribution of Xist RNA in the nucleus upon PRC1 deletion. In RADICL-seq results, we also identified several other non-coding RNA candidates that had similar behavior to Xist, i.e. losing their chromatin binding upon PRC1 deletion.
By using live-cell imaging analysis of Xist RNA with 1 minute interval, we found that Xist RNA does not make any major movement in PRC1-deleted cells in this time-window, suggesting that Xist RNA has intrinsic ability to bind to chromatin and/or nuclear matrix and does not freely move around in the nucleus even in the absence of PRC1-dependent tethering to the inactive X chromosome.

Academic Significance and Societal Importance of the Research Achievements

Xist RNA などのnon-coding RNAは、標的遺伝子の転写を調節して生物個体の恒常性の維持に関わり、その破綻は疾患の原因となることが知られている。従ってnon-coding RNA の作用するメカニズムを解明することは、遺伝子転写調節機構を明らかにするだけでなく、疾患の予防や治療方法の分子基盤をもたらすと期待できる。本研究では転写抑制に関わるポリコーム複合体PRC1がXist RNAなどのnon-coding RNAをクロマチンに繋留することを明らかにした。今後さらに解析を進めて、その詳細な分子メカニズムの解明を行うことを目指す。

Report

(3 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • Research Products

    (2 results)

All 2023 2021

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

  • [Journal Article] Polycomb repressive complexes 1 and 2 are each essential for maintenance of X inactivation in extra-embryonic lineages2023

    • Author(s)
      Masui Osamu、Corbel Catherine、Nagao Koji、Endo Takaho A.、Kezuka Fuyuko、Diabangouaya Patricia、Nakayama Manabu、Kumon Mami、Koseki Yoko、Obuse Chikashi、Koseki Haruhiko、Heard Edith
    • Journal Title

      Nature Cell Biology

      Volume: 25 Issue: 1 Pages: 134-144

    • DOI

      10.1038/s41556-022-01047-y

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Polycomb complexes PRC1 and PRC2 are each essential for maintenance of X inactivation in extra embryonic lineages2021

    • Author(s)
      Osamu Masui
    • Organizer
      第44回日本分子生物学会年会
    • Related Report
      2021 Research-status Report

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Published: 2021-07-13   Modified: 2024-01-30  

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