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18-1-8 complex as a therapeutic target?

Research Project

Project/Area Number 22K15040
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 43010:Molecular biology-related
Research InstitutionTokyo Metropolitan University

Principal Investigator

Kawasumi Ryotaro  東京都立大学, 理学研究科, 特任助教 (60943545)

Project Period (FY) 2022-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2022: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
KeywordsCTF18 / 合成致死 / DNA複製 / 染色体分配 / PRIMPOL / がん / DNA修復 / コヒーシン / ゲノム恒常性
Outline of Research at the Start

近年、副作用の少ないがん治療薬として、複数の遺伝子の変異が合わさることで細胞死を招く「合成致死性」を利用した分子標的薬が広まってきている。例として、乳がん・卵巣がんに多くみられるBRCA遺伝子の変異に対してはPARP阻害薬の有効性が実証されている。 CTF18は多様ながん細胞て増幅が認められる遺伝子であり、合成致死となる遺伝子の組み合わせかが非常に多いことかが予想される、分子標的薬のターゲットとして有望な遺伝子である。
本研究では、CTF18と合成致死となる遺伝子を探索しその原因を理解す ることで、CTF18を標的とした新規分子標的薬の創薬の促進を狙う。

Outline of Final Research Achievements

Cancer is caused by mutations on genes that result in dysregulation of cellular proliferation. Oncogenic mutations often increase the dependency of cancer cells on complementary genes, thus such complementary genes are attractive targets of molecular targeting drugs. One of the great example is PARP inhibitors proven to be efficient in familial breast cancer treatment harboring BRCA mutations. CTF18 is known to be involved in DNA replication and segregation, and suggested to be synthetically lethal with over 30 genes, making it an attractive target for cancer therapy.
In this study, we discovered that CTF18 and PRIMPOL are synthetically lethal in the absence of DDX11. As CTF18 stabilizes replication factors including polymetrase alpha complex on DNA, CTF18 and PRIMPOL may compensate each other for DNA repriming.

Academic Significance and Societal Importance of the Research Achievements

本研究ではCTF18がDNA複製中にリプライミングにおいて重要な役割を果たしている可能性が明らかとなった。これはDNA複製において、リーディング鎖においてもリプライミングが頻繁に起きている可能性を示すものであり、従来のDNA複製モデルに対して一石投じるものとなった。
また、急性白血病などの治療薬であるシタラビンの耐性機構にCTF18とSAMHD1が並行して寄与していることを明らかにした。したがってCTF18やSAMHD1の阻害薬を用いることでシタラビンによる抗がん治療の有効性を高めることができる可能性が示された。

Report

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

    (13 results)

All 2024 2023 2022 Other

All Int'l Joint Research (2 results) Journal Article (7 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 6 results,  Open Access: 3 results) Presentation (3 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results) Remarks (1 results)

  • [Int'l Joint Research] IFOM分子腫瘍学研究所(イタリア)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] IFOM分子腫瘍学研究所(イタリア)

    • Related Report
      2022 Research-status Report
  • [Journal Article] Proofreading exonuclease activity of replicative polymerase epsilon promotes cellular tolerance to arabinosides in CTF18-dependent and -independent manner2024

    • Author(s)
      Rahman Md. Ratul、Hirota Kouji、Kawasumi Ryotaro
    • Journal Title

      Genome Instability & Disease

      Volume: 5 Issue: 2 Pages: 76-88

    • DOI

      10.1007/s42764-024-00124-w

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Pold4 subunit of replicative polymerase δ promotes fork slowing at broken templates2024

    • Author(s)
      Kojima Kota、Ohkubo Hiromori、Kawasumi Ryotaro、Hirota Kouji
    • Journal Title

      DNA Repair

      Volume: 139 Pages: 103688-103688

    • DOI

      10.1016/j.dnarep.2024.103688

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Dominant roles of BRCA1 in cellular tolerance to a chain-terminating nucleoside analog, alovudine2024

    • Author(s)
      Hosen Md Bayejid、Kawasumi Ryotaro、Hirota Kouji
    • Journal Title

      DNA Repair

      Volume: 137 Pages: 103668-103668

    • DOI

      10.1016/j.dnarep.2024.103668

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] CTF18-RFC contributes to cellular tolerance against chain-terminating nucleoside analogs (CTNAs) in cooperation with proofreading exonuclease activity of DNA polymerase ε2023

    • Author(s)
      Washif Mubasshir、Ahmad Tasnim、Hosen Md Bayejid、Rahman Md Ratul、Taniguchi Tomoya、Okubo Hiromori、Hirota Kouji、Kawasumi Ryotaro
    • Journal Title

      DNA Repair

      Volume: 127 Pages: 103503-103503

    • DOI

      10.1016/j.dnarep.2023.103503

    • Related Report
      2023 Annual Research Report 2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] PCNA recruits cohesin loader Scc2 to ensure sister chromatid cohesion2023

    • Author(s)
      Psakhye Ivan、Kawasumi Ryotaro、Abe Takuya、Hirota Kouji、Branzei Dana
    • Journal Title

      Nature Structural & Molecular Biology

      Volume: 30 Issue: 9 Pages: 1286-1294

    • DOI

      10.1038/s41594-023-01064-x

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The proofreading exonuclease of leading-strand DNA polymerase epsilon prevents replication fork collapse at broken template strands2023

    • Author(s)
      Ahmad Tasnim、Kawasumi Ryotaro、Taniguchi Tomoya、Abe Takuya、Terada Kazuhiro、Tsuda Masataka、Shimizu Naoto、Tsurimoto Toshiki、Takeda Shunichi、Hirota Kouji
    • Journal Title

      Nucleic Acids Research

      Volume: 51 Issue: 22 Pages: 12288-12302

    • DOI

      10.1093/nar/gkad999

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] PCNA recruits cohesin loader Scc2/NIPBL to ensure sister chromatid cohesion2022

    • Author(s)
      Psakhye Ivan、Kawasumi Ryotaro、Abe Takuya、Hirota Kouji、Branzei Dana
    • Journal Title

      BioRxiv

      Volume: -

    • DOI

      10.1101/2022.09.16.508217

    • Related Report
      2022 Research-status Report
    • Open Access / Int'l Joint Research
  • [Presentation] DNA修復遺伝子ノックアウトパネルによる核酸アナログ遺伝毒性の評価2023

    • Author(s)
      川澄遼太郎
    • Organizer
      第11回DNA損傷応答ワークショップ
    • Related Report
      2023 Annual Research Report
  • [Presentation] DNA 複製と連動した姉妹染色分体間接着形成メカニズム2023

    • Author(s)
      川澄遼太郎
    • Organizer
      第41回染色体ワークショップ・第22回核ダイナミクス研究会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 複製とコヒージョン形成の連動によるゲノム安定性の維持2022

    • Author(s)
      川澄遼太郎
    • Organizer
      第45回日本分子生物学会年会
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Remarks] 【~

    • Related Report
      2023 Annual Research Report

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Published: 2022-04-19   Modified: 2025-01-30  

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