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DNA polymerase dynamics and genome stability

Research Project

Project/Area Number 20H03233
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 43050:Genome biology-related
Research InstitutionJapanese Foundation for Cancer Research (2022)
Tohoku University (2020-2021)

Principal Investigator

DAIGAKU Yasukazu  公益財団法人がん研究会, がん研究所 がんゲノム動態プロジェクト, プロジェクトリーダー (80619875)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2022: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2021: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2020: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
KeywordsDNA複製 / 突然変異 / DNAポリメラーゼ / 突然変異生成 / ゲノム安定性
Outline of Research at the Start

真核生物では,比較的正確な複製を行うPolε(イプシロン),Polδ(デルタ)がゲノム複製の大半を担うが,最近の研究では,誤りがちなポリメラーゼのゲノム複製への関与も示されている.中でも,Polζ(ゼータ)は自然突然変異の主な原因であり,遺伝情報の安定性とDNAポリメラーゼ機能との関連を論ずる上で重要な分子である.PolζはPolδとサブユニットを共有し,細胞内でのPolδの状態がPolζの機能に影響すると考えられる.本研究では,Polδのサブユニットの核内での動態がPolζの機能に及ぼす影響を明らかにし,時間的・空間的に均一でないDNA複製機構が,どのようにゲノム情報の安定性に関わるかを解明する.

Outline of Final Research Achievements

There are 15 different DNA polymerases in eukaryotes and the fidelity and efficiency of their synthetic activities are distinct. The correct division of labour among these polymerases is therefore a primary factor in determining the stability of genome duplication. Among these DNA polymerases, polymerase ζ (Polζ) was previously identified to be the main cause of spontaneous mutagenesis and share subunits with Polymerase δ (Polδ), which is responsible for lagging strand DNA synthesis. In this study, we investigated how the function of Polζ is regulated by subunits of Polδ. We discovered that, in the content of DNA damage tolerance, the abundance of Cdc1 (one of the Polδ subunits) is the key factor to activate Polζ. We also observed that the relative amount of Cdc1 to the Polδ catalytic subunit Cdc6 are increased in G2 phase. This trend in the protein level of Cdc1 may lead to high Polζ activity in G2 phase and mutagenesis by this polymerase.

Academic Significance and Societal Importance of the Research Achievements

本研究は、分裂酵母を中心的に使用し、突然変異の主な原因となるポリメラーゼの制御を明らかにすることを目的とした。今後、哺乳類細胞を対象とした研究へと発展させることにより、がん細胞における突然変異率の上昇の原因究明に貢献することが大いに期待される。また、この研究をモデルとして、その他の多くのDNAポリメラーゼを対象に加えた研究へと発展させ、多種多様なDNAポリメラーゼが協調的に機能する仕組みが明らかになると期待される。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (8 results)

All 2022 2021

All Journal Article (2 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 1 results,  Open Access: 2 results) Presentation (6 results) (of which Int'l Joint Research: 1 results,  Invited: 3 results)

  • [Journal Article] Global landscape of replicative DNA polymerase usage in the human genome2022

    • Author(s)
      Koyanagi Eri、Kakimoto Yoko、Minamisawa Tamiko、Yoshifuji Fumiya、Natsume Toyoaki、Higashitani Atsushi、Ogi Tomoo、Carr Antony M.、Kanemaki Masato T.、Daigaku Yasukazu
    • Journal Title

      Nature Communications

      Volume: 13 Issue: 1 Pages: 7221-7221

    • DOI

      10.1038/s41467-022-34929-8

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Global landscape of replicative DNA polymerase usage in the human genome2021

    • Author(s)
      Koyanagi Eri、Kakimoto Yoko、Yoshifuji Fumiya、Natsume Toyoaki、Higashitani Atsushi、Ogi Tomoo、Carr Antony M.、Kanemaki Masato T.、Daigaku Yasukazu
    • Journal Title

      BioRxiv

      Volume: - Pages: 1-41

    • DOI

      10.1101/2021.11.14.468503

    • Related Report
      2021 Annual Research Report
    • Open Access / Int'l Joint Research
  • [Presentation] DNAポリメラーゼ機能と複製フォーク動態における柔軟性と脆弱性2022

    • Author(s)
      大学保一
    • Organizer
      第45回日本分子生物学会年会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] DNA polymerase dynamics and genomic instability2022

    • Author(s)
      大学保一, 鐘巻将人
    • Organizer
      第81回日本癌学会学術総会
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 遺伝子分布・転写機構が複製フォーク動態に及ぼす影響2022

    • Author(s)
      大学保一, 小柳恵理, 柿本洋子, 南澤宝美后, 夏目豊彰, 鐘巻将人
    • Organizer
      日本遺伝学会 第94回大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 核内環境に応じた複製フォーク動態の多様性2021

    • Author(s)
      小柳恵理, 柿本洋子, 大学保一
    • Organizer
      日本遺伝学会第92回大会
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] 遺伝子転写のDNAポリメラーゼ動態への影響2021

    • Author(s)
      小柳恵理, 柿本洋子, 荻朋男, 夏目豊彰, 鐘巻将人, 大学保一
    • Organizer
      第26回DNA複製・組換え・修復ワークショップ
    • Related Report
      2021 Annual Research Report
  • [Presentation] DNAポリメラーゼ動態から見る,転写機構の染色体複製への影響2021

    • Author(s)
      小柳恵理, 柿本洋子, 荻朋男, 夏目豊彰, 鐘巻将人, 大学保一
    • Organizer
      第39回染色体ワークショップ・第20回核ダイナミクス研究会
    • Related Report
      2021 Annual Research Report

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Published: 2020-04-28   Modified: 2024-01-30  

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