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Elucidation of the Mechanism of DNA Damage Toxicity Induction by Mutant TREX1 Causing Leukoencephalopathy and Its Inhibitory Molecules

Research Project

Project/Area Number 22K20882
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0902:General internal medicine and related fields
Research InstitutionNiigata University

Principal Investigator

Shoichiro Ando  新潟大学, 医歯学総合病院, 助教 (10918428)

Project Period (FY) 2022-08-31 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
KeywordsRVCL-S / TREX1 / DNA二本鎖切断損傷 / 相同組換え修復 / 細胞老化 / RVCL / 脳小血管病 / DNA損傷 / HDR
Outline of Research at the Start

Retinal vasculopathy with cerebral leukoencephalopathy(RVCL)は、40代前後で発症し、約10年の経過で死亡する、遺伝性脳小血管病である。原因遺伝子は、three-prime repair exonuclease 1(TREX1)遺伝子である。申請者は、これまでに、ヒト細胞モデルにおいてRVCL変異TREX1が、核内局在とエキソヌクレアーゼ活性に依存したDNA切断損傷と細胞毒性をもたらすことを見出した。本研究では、ショウジョウバエモデルのRNAiスクリーニングで見出した、表現型抑制候補遺伝子がヒト遺伝子種で治療標的となり得るか検証する。

Outline of Final Research Achievements

We hypothesized that the pathogenesis of RVCL-S is due to abnormalities in DNA damage or its repair pathways and conducted a validation study. As a result, we found that the RVCL-S type mutant TREX1 induced DNA double-strand break (DSB) damage and caused cellular senescence in a manner dependent on its enzymatic activity and nuclear localization.
Additionally, we discovered that the RVCL-S type mutant TREX1 impaired homologous recombination repair (HDR), which contributes to DSB repair. Importantly, although the expression of normal TREX1 is tightly regulated and extremely low, it is highly expressed in patient tissues, and this expression of TREX1 is induced by the senescence-associated secretory phenotype (SASP).

Academic Significance and Societal Importance of the Research Achievements

RVCL-S型変異TREX1がHDR抑制による二本鎖DNA切断修復異常によるDNA損傷毒性をきたすという病態機序仮説は、現在我々のみが保有する新規のものであり、学術的意義が高い。この病態機序仮説をもとに、これまで疾患修飾療法が全く存在しなかったRVCL-Sに対して、新規の治療戦略を提案することが可能である。RVCL-Sは希少疾患ではあるが、常染色体顕性遺伝性疾患であり、本疾患の治療可能性を見出すことは、社会的意義が大きい。

Report

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

    (7 results)

All 2024 2023 2022

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (5 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Missense Variants in COL4A1/2 Are Associated with Cerebral Aneurysms: A Case Report and Literature Review2024

    • Author(s)
      Masahiro Uemura, Natsuki Tanaka, Shoichiro Ando, Takehiko Yanagihara and Osamu Onodera
    • Journal Title

      Neurology International

      Volume: 16 Issue: 1 Pages: 226-238

    • DOI

      10.3390/neurolint16010015

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] High frequency of<i>HTRA1</i>AND<i>ABCC6</i>mutations in Japanese patients with adult-onset cerebral small vessel disease2022

    • Author(s)
      Uemura Masahiro、Hatano Yuya、Nozaki Hiroaki、Ando Shoichiro、Onodera Osamu et al.
    • Journal Title

      Journal of Neurology, Neurosurgery & Psychiatry

      Volume: 94 Issue: 1 Pages: 74-81

    • DOI

      10.1136/jnnp-2022-329917

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] The characteristics of cerebrovascular diseases in pseudoxanthoma elasticum, literature review.2023

    • Author(s)
      Shoichiro Ando, Sho Kitahara, Masahiro Uemura, and Osamu Onodera
    • Organizer
      第64回日本神経学会学術大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Venous Collagenosis in HTRA1-Related Cerebral Small Vessel Disease.2023

    • Author(s)
      Shoichiro Ando, Rie Saito, Masahiro Uemura, Sho Kitahara, Yuya Hatano, Masaki Watanabe, Taisuke Kato, Yosuke Ito, Atchayaram Nalini, Shigeo Murayama, Akiyoshi Kakita, Hironaka Igarashi, and Osamu Onodera
    • Organizer
      Asia Pacific Stroke Conference 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] The longitudinal evaluation of inflammatory cytokines expression in RVCL in vitro model.2022

    • Author(s)
      Ando Shoichiro, Kato Taisuke, Nozaki Hiroaki, Kasahara Kyoko, Onodera Osamu
    • Organizer
      第41回日本認知症学会学術集会
    • Related Report
      2022 Research-status Report
  • [Presentation] Aberrant immunity caused by RVCL-mutant TREX1 depends on nuclear localization and enzyme activity2022

    • Author(s)
      Kitahara Sho, Ando Shoichiro, Kato Taisuke, Nozaki Hiroaki, Kasahara Kyoko, Onodera Osamu
    • Organizer
      Society for Neuroscience 2022
    • Related Report
      2022 Research-status Report
  • [Presentation] Clinical characteristics of cerebral small vessel disease in pseudoxanthoma elasticum.2022

    • Author(s)
      Ando Shoichiro, Uemura Masahiro, Kitahara Sho, Homma Yutaka, Aizawa Hitoshi, Iwanaga Akira, Murota Hiroyuki, Onodera Osamu
    • Organizer
      第67回日本人類遺伝学会学術集会
    • Related Report
      2022 Research-status Report

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Published: 2022-09-01   Modified: 2025-01-30  

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