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Cellular responses to DNA double-strand breaks caused by transcription stress

Research Project

Project/Area Number 21K12245
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 63020:Radiation influence-related
Research InstitutionKanazawa Medical University

Principal Investigator

SAKASAI Ryo  金沢医科大学, 医学部, 准教授 (10549950)

Co-Investigator(Kenkyū-buntansha) 西 良太郎  東京工科大学, 応用生物学部, 准教授 (80446525)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
KeywordsDNA二本鎖切断 / 転写 / カンプトテシン / DNAトポイソメラーゼ / 転写ストレス
Outline of Research at the Start

抗がん剤であるカンプトテシン(CPT)は、DNAトポイソメラーゼI(Top1)の異常な反応中間体をDNA上に蓄積させる。CPTは癌細胞も殺すが、副作用として神経症状が知られており、Top1異常中間体による転写ストレスが関係していると考えられるが、詳細は不明である。我々は、転写ストレス時にDNAが切れることを報告したが、その切断機構および修復機構はわかっていない。本研究では、CPTによる転写ストレス時におけるDNAの切断・修復機構を明らかにし、転写ストレスに対する細胞応答の解明を目指す。

Outline of Final Research Achievements

Transcriptional stress induced by the anti-cancer drug camptothecin (CPT) is known to cause DNA double-strand breaks (transcription-coupled DSBs, tc-DSBs), but the mechanisms of tc-DSB generation and repair have not been well understood. We analyzed tc-DSB response by focusing on RecQL5, a DNA helicase, which suggests that DNA secondary structures related to the DNA-RNA hybrid are induced in the vicinity of stalled transcription machinery, but in RecQL5-deficient cells, the DNA secondary structures are not resolved and leads the involvement of another DNA repair TC-NER, resulting in tc-DSB generation.

Academic Significance and Societal Importance of the Research Achievements

本研究は、抗がん剤であるCPTによる細胞影響において、あまり研究が進んでいない転写に対する影響に注目したものである。転写は全ての細胞で起こっており、転写ストレス応答の解明は、CPT誘導体を用いた化学療法における副作用を考える上で重要と考えられる。また、Top1-DPCの代謝異常は神経変性疾患との関連が言われており、本研究の成果はTop1-DPCが神経細胞で毒性を発揮する機構を示唆するもので、神経疾患の病態解明にもつながる可能性がある。

Report

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

    (10 results)

All 2023 2022 2021 Other

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

  • [Journal Article] UbcH5c-dependent activation of DNA-dependent protein kinase in response to replication-mediated DNA double-strand breaks2023

    • Author(s)
      Sakasai Ryo、Matsui Tadashi、Sunatani Yumi、Iwabuchi Kuniyoshi
    • Journal Title

      Biochemical and Biophysical Research Communications

      Volume: 668 Pages: 42-48

    • DOI

      10.1016/j.bbrc.2023.05.068

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Camptothecin compromises transcription recovery and cell survival against cisplatin and ultraviolet irradiation regardless of transcription-coupled nucleotide excision repair2022

    • Author(s)
      Sakasai Ryo、Wakasugi Mitsuo、Matsui Tadashi、Sunatani Yumi、Saijo Masafumi、Matsunaga Tsukasa、Iwabuchi Kuniyoshi
    • Journal Title

      DNA Repair

      Volume: 113 Pages: 103318-103318

    • DOI

      10.1016/j.dnarep.2022.103318

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Lens-specific conditional knockout of tropomyosin 1 gene in mice causes abnormal fiber differentiation and lens opacity2021

    • Author(s)
      Shibata Teppei、Ikawa Masahito、Sakasai Ryo、Ishigaki Yasuhito、Kiyokawa Etsuko、Iwabuchi Kuniyoshi、Singh Dhirendra P、Sasaki Hiroshi、Kubo Eri
    • Journal Title

      Mechanisms of Ageing and Development

      Volume: 196 Pages: 111492-111492

    • DOI

      10.1016/j.mad.2021.111492

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] DNA 複製を介したDNA二本鎖切断に対し、BRCA2は53BP1-核ラミナ-LINC複合体を介した核の断片化を抑制する2023

    • Author(s)
      逆井良、松井理、砂谷優実、岩淵邦芳
    • Organizer
      第27回 DNA 複製・組換え・修復ワークショップ
    • Related Report
      2023 Annual Research Report
  • [Presentation] DNA複製を介したDNA二本鎖切断の修復機構とその破綻による核の断片化2023

    • Author(s)
      逆井良、松井理、砂谷優実、岩淵邦芳
    • Organizer
      第96回 日本生化学会大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] BRCA2 prevents nuclear fragmentation mediated by LINC-lamina-53BP1 axis in response to one-ended DNA double-strand breaks2023

    • Author(s)
      Ryo Sakasai, Yumi Sunatani, Tadashi Matsui, Kuniyoshi Iwabuchi
    • Organizer
      The 19th Ataxia-Telangiectasia workshop
    • Related Report
      2022 Research-status Report
  • [Presentation] 53BP1- and BRCA2-dependent biphasic repair of replication-mediated one-ended DSBs2022

    • Author(s)
      逆井良、岩淵邦芳
    • Organizer
      第9回DNA損傷応答ワークショップ
    • Related Report
      2022 Research-status Report
  • [Presentation] 53BP1- and BRCA2-dependent biphasic repair of replication-mediated one-ended DSBs2022

    • Author(s)
      Ryo Sakasai, Yumi Sunatani, Tadashi Matsui, Kuniyoshi Iwabuchi
    • Organizer
      日本放射線影響学会 第65回大会
    • Related Report
      2022 Research-status Report
  • [Presentation] カンプトテシンはDNA損傷後の転写の回復を阻害しシスプラチンに対する殺細胞効果を増強する2021

    • Author(s)
      逆井良、若杉光夫、松井理、砂谷優実、西條将文、松永司、岩淵邦芳
    • Organizer
      第44回日本分子生物学会年会
    • Related Report
      2021 Research-status Report
  • [Remarks] 金沢医科大学 医学部 生化学I

    • URL

      https://kmu-bc1.jimdofree.com/

    • Related Report
      2022 Research-status Report

URL: 

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

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