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Elucidation of regulation mechanisms of CpG islands via Ubiquitin-proteasome system

Research Project

Project/Area Number 19K06621
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 43050:Genome biology-related
Research InstitutionInstitute of Physical and Chemical Research

Principal Investigator

Ito Shinsuke  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 (50612115)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywordsポリコーム / 遺伝子発現制御 / CpGアイランド / プロテアソーム / ユビキチン / SKP1A / ポリユビキチン化 / CGI / エピジェネティクス
Outline of Research at the Start

哺乳類ゲノムの転写開始点付近に多く存在するCpGアイランド (CGI)は、エピジェネティック修飾のプラットフォームとして寄与して遺伝子発現制御を担っているが、エピジェネティック修飾を適切に導入する機構は不明な点が多い。CGIを認識するCXXCドメインを含有するKDM2Bを中心として解析し、KDM2Bが選択的に20%のCGIにポリコーム群複合体をリクルートするメカニズム、一方で残りの80%のCGIからポリコーム群複合体を排除するメカニズムを解析し、CGIエピゲノム制御のメカニズムを解明することを目指す。

Outline of Final Research Achievements

Variant PCGF1-PRC1 (PRC1.1) that contains PCGF1, KDM2B, SKP1, BCOR, PCGF1, RING1A/B, and RYBP has been reported to contribute to the initiation of PcG silencing by recognizing CpG islands (CGIs) by the CXXC domain of KDM2B and mediating H2AK119ub1 by the RING1B/PCGF1 dimer. Notably, SKP1 associates with the F-box of KDM2B, potentially forming an SCF (SKP1A/CULLIN/F-box) ubiquitin ligase complex. These apparent biochemical properties of PRC1.1 suggest that there may be additional modes of action involving ubiquitin-related regulatory systems such as the proteasome. Here, we thus set out to explore the possibility that PRC1.1 could utilize proteasome-dependent pathways to regulate the expression of PcG target genes. Indeed, we identified none-histone protein as substrates for poly-ubiquitination by PRC1.1, which lead to degradation of protein and subsequent activation of repressed genes. We have prepared manuscript for submission.

Academic Significance and Societal Importance of the Research Achievements

本研究では、ポリユビキチン化を介したポリコームノ分解という独自の概念を導入し、抑制された遺伝子がどのようにして活性化されるのかの解明に繋がる成果と考えている。本研究からPRC1.1がゲノム上のCGIをスキャンニングして、適切な場所では結合が維持され、不適切な場所では自己によるポリユビキチン化後にプロテアソームにより分解されるという適材適所の選択圧がかかっている事が示唆された。とりわけ、細胞が発生・分化のように状態を大きく変化する時、このPRC1.1のポリユビキチン化機能が重要になると考えている。

Report

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

    (8 results)

All 2021 2019 Other

All Int'l Joint Research (4 results) Journal Article (3 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (1 results)

  • [Int'l Joint Research] University of Oxford(英国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] University of Copenhagen(デンマーク)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] University of Copenhagen(デンマーク)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] オックスフォード大学(英国)

    • Related Report
      2019 Research-status Report
  • [Journal Article] Variant PCGF1-PRC1 links PRC2 recruitment with differentiation-associated transcriptional inactivation at target genes2021

    • Author(s)
      Sugishita Hiroki、Kondo Takashi、Ito Shinsuke、Nakayama Manabu、Yakushiji-Kaminatsui Nayuta、Kawakami Eiryo、Koseki Yoko、Ohinata Yasuhide、Sharif Jafar、Harachi Mio、Blackledge Neil P.、Klose Robert J.、Koseki Haruhiko
    • Journal Title

      Nature Communications

      Volume: 12 Issue: 1 Pages: 5341-5341

    • DOI

      10.1038/s41467-021-24894-z

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Enhancers are activated by p300/CBP activity-dependent PIC assembly, RNAPII recruitment, and pause release2021

    • Author(s)
      Takeo Narita, Shinsuke Ito, Yoshiki Higashijima, Wai Kit Chu, Katrin Neumann, Jonas Walter, Shankha Satpathy, Tim Liebner, William B Hamilton, Elina Maskey, Gabriela Prus, Marika Shibata, Vytautas Iesmantavicius, Joshua M Brickman, Konstantinos Anastassiadis, Haruhiko Koseki, Chunaram Choudhary
    • Journal Title

      Molecular Cell

      Volume: 21 Issue: 10 Pages: 2166-2182.e6

    • DOI

      10.1016/j.molcel.2021.03.008

    • Related Report
      2021 Annual Research Report 2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Synergy between Variant PRC1 Complexes Defines Polycomb-Mediated Gene Repression2019

    • Author(s)
      Fursova NA, Blackledge NP, Nakayama M, Ito S, Koseki Y, Farcas AM, King HW, Koseki H, Klose RJ.
    • Journal Title

      Molecular Cell

      Volume: 印刷中 Issue: 5 Pages: 1020-1036

    • DOI

      10.1016/j.molcel.2019.03.024

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Polycomb-proteasome axis shapes the epigenetic landscape of CpG islands2019

    • Author(s)
      伊藤伸介
    • Organizer
      エピジェネティクス研究会
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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