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Elucidation of spatiotemporal control mechanism of dead cell DNA degrading enzymes by phase separation

Research Project

Project/Area Number 21K07086
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 49070:Immunology-related
Research InstitutionTokyo University of Science

Principal Investigator

Mizuta Ryushin  東京理科大学, 研究推進機構生命医科学研究所, 教授 (50297628)

Co-Investigator(Kenkyū-buntansha) 北村 大介  東京理科大学, 研究推進機構生命医科学研究所, 教授 (70204914)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2023: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
KeywordsDNase γ / DNase1L3 / DNase 1 / 相分離 / cfDNA / 抗腫瘍効果 / クロマチン / Histone H1 / DNase1 / ヘテロクロマチン
Outline of Research at the Start

DNase γはDNase1ファミリーに属するDNA分解酵素で、血流中に存在している。漏出したクロマチンはまずDNase γで大きく切断され、次にDNase1で細かく裁断されるが、その時間的・空間的使い分けのメカニズムは不明であった。最近、クロマチンの高次構造も、その構成タンパク質であるHistone H1の相分離によって維持されていることが分かってきた。そこで、DNase γはDNase1に比べ、相分離クロマチンへの親和性が高く、これがDNase γとDNase1の使い分けに反映されているという仮説を立てた。本研究では、この仮説の検証と、各DNaseの生体内での役割の全容解明を目指す。

Outline of Final Research Achievements

DNase γ (also known as DNase1L3) is a DNA-degrading enzyme that belongs to the DNase 1 family and is present in the bloodstream together with DNase 1. The leaked chromatin is first largely cleaved by DNase γ and released into the bloodstream as cell-free DNA (cfDNA). It is then finely cut by DNase 1, but the mechanism of its temporal and spatial differentiation was unknown. We found that the difference in affinity to phase-separated chromatin creates the difference in its differentiation, and that DNase 1 is also involved in the generation of cfDNA. Furthermore, experiments with gene-deficient mice revealed that DNase γ has antitumor activity.

Academic Significance and Societal Importance of the Research Achievements

この研究は20年にわたるDNase γを中心とした死細胞DNAの分解研究の集大成であるとともに、DNA分解と相分離の関連を見出した事により、新たな展開の道を開いた。より普遍的には、生命現象の根本に相分離を位置づけ、個別の事象を統一的に捉えなおすきっかけになることが期待される。またDNase γの抗腫瘍活性の発見は新規治療戦略の創出という点で、臨床的に意義がある。

Report

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

    (3 results)

All 2023 2022 Other

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

  • [Int'l Joint Research] NIEHS/University of North Carolina(米国)

    • Related Report
      2023 Annual Research Report
  • [Journal Article] DNASE1L3 enhances antitumor immunity and suppresses tumor progression in colon cancer2023

    • Author(s)
      Li Wenling、Nakano Hideki、Fan Wei、Li Yuanyuan、Sil Payel、Nakano Keiko、Zhao Fei、Karmaus Peer W.、Grimm Sara A.、Shi Min、Xu Xin、Mizuta Ryushin、Kitamura Daisuke、Wan Yisong、Fessler Michael B.、Cook Donald N.、Shats Igor、Li Xiaoling、Li Leping
    • Journal Title

      JCI Insight

      Volume: 8 Issue: 17

    • DOI

      10.1172/jci.insight.168161

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The difference of chows affects mouse physiological conditions2022

    • Author(s)
      WATANABE Taiki、TAKADA Shuhei、ONOZATO Mayu、FUKUSHIMA Takeshi、MIZUTA Ryushin
    • Journal Title

      Journal of Veterinary Medical Science

      Volume: 84 Issue: 4 Pages: 582-584

    • DOI

      10.1292/jvms.21-0457

    • NAID

      130008159734

    • ISSN
      0916-7250, 1347-7439
    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access

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

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