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Mechanisms underlying pathogenic mutations in genetic diseases by break-induced replication

Research Project

Project/Area Number 20K21591
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 53:Organ-based internal medicine and related fields
Research InstitutionUniversity of Tsukuba

Principal Investigator

Nomura Toshifumi  筑波大学, 医学医療系, 教授 (50399911)

Project Period (FY) 2020-07-30 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2021: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2020: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywords遺伝性皮膚疾患 / 復帰変異モザイク / revertant mosaicism / BIR / 魚鱗癬
Outline of Research at the Start

先天性魚鱗癬の一部では、患者皮膚の一部から後天的に病因遺伝子変異が消失し、正常化することが知られている。この現象をrevertant mosaicismと呼ぶ。この仕組みが解明されると、遺伝性疾患の新しい治療法の開発につながる可能性がある。これまでの研究により、病因遺伝子変異が相同組換えで消失していることを突き止めているので、この研究では、病因タンパク質が相同組換えを誘導するメカニズムを解析する。

Outline of Final Research Achievements

Pityriasis rubra pilaris type 5 is an autosomal dominant skin disorder caused by gain-of-function mutations in CARD14. Interestingly, clinically, histopathologically, and genetically cured small skin spots appear in patients with pityriasis rubra pilaris type 5. In this study, we unveiled the mechanisms underlying the disappearance of such pathogenic mutations from the patients' epidermis. We showed that mutant CARD14 alters replication stress response and break-induced replication is the major mechanism underlying such reversion of the pathogenic mutations in CARD14.

Academic Significance and Societal Importance of the Research Achievements

今回の研究により、毛孔性紅色粃糠疹5型でなぜ病因遺伝子変異が表皮角化細胞から消失するか解明できたことにより、患者の細胞には自然に遺伝子変異を修復する能力が備わっていることが明らかになりました。このような仕組みをうまくいかせば、現在は対症療法しかなく根治的な治療法がない毛孔性紅色粃糠疹5型はもちろん、他の遺伝性疾患の新規治療法の開発につながることが期待できます。また、遺伝子変異が消失する仕組みとしてbreak-induced replicationが起こっていましたが、人におけるこの現象は未解明な点が多いことから、この分野への貢献も期待できます。

Report

(3 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • Research Products

    (4 results)

All 2021 2020

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

  • [Journal Article] Altered replication stress response due to CARD14 mutations promotes recombination-induced revertant mosaicism2021

    • Author(s)
      Miyauchi Toshinari、Suzuki Shotaro、Takeda Masae、Peh Jin Teng、Aiba Masayuki、Natsuga Ken、Fujita Yasuyuki、Takeichi Takuya、Sakamoto Taiko、Akiyama Masashi、Shimizu Hiroshi、Nomura Toshifumi
    • Journal Title

      The American Journal of Human Genetics

      Volume: 108 Issue: 6 Pages: 1026-1039

    • DOI

      10.1016/j.ajhg.2021.04.021

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Acute skin barrier disruption alters the secretion of lamellar bodies via the multilayered expression of ABCA122020

    • Author(s)
      Teramura Takashi、Nomura Toshifumi
    • Journal Title

      Journal of Dermatological Science

      Volume: 100 Issue: 1 Pages: 50-57

    • DOI

      10.1016/j.jdermsci.2020.08.010

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Hereditary Mucoepithelial Dysplasia and Autosomal-Dominant IFAP Syndrome Is a Clinical Spectrum Due to SREBF1 Variants2020

    • Author(s)
      Murase Chiaki、Takeichi Takuya、Nomura Toshifumi、Ogi Tomoo、Akiyama Masashi
    • Journal Title

      Journal of Investigative Dermatology

      Volume: in press Issue: 6 Pages: 1596-1598

    • DOI

      10.1016/j.jid.2020.09.035

    • NAID

      120007175360

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] Revertant mosaicism in inherited disorders of keratinization2021

    • Author(s)
      Toshifumi Nomura
    • Organizer
      The 46th Annual Meeting of the Japanese Society for Investigative Dermatology
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited

URL: 

Published: 2020-08-03   Modified: 2023-01-30  

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