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Elucidation of the pathogenesis of genetic encephalopathy caused by defects in RNA editing

Research Project

Project/Area Number 21K07080
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 49070:Immunology-related
Research InstitutionOsaka University

Principal Investigator

Nakahama Taisuke  大阪大学, 大学院医学系研究科, 助教 (10636187)

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: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2022: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
KeywordsRNA編集 / ADAR1 / AGS / 脳症 / MDA5 / エカルディ・グティエール症候群
Outline of Research at the Start

エカルディ・グティエール症候群(AGS)は、インターフェロン(IFN)の異常産生を伴う先天性脳症である。現状では脳症を再現するモデルは確立されておらず、その病態形成機構は不明である。そこで、本疾患で同定されているRNA編集酵素ADAR1遺伝子変異をノックインした(AGS KI)マウスを作成したところ、脳をはじめとする様々な臓器でIFN誘導遺伝子群(ISG)の発現上昇が認められ、新規のAGSモデルとなる可能性が示唆された。そこで本研究では、AGS KIマウスを用いて、AGS脳症の病態形成機構を解明し、将来的なAGSの治療に向けた分子基盤情報の確立を目的とする。

Outline of Final Research Achievements

Mutations in the RNA-editing enzyme ADAR1 cause Aicardi-Goutieres syndrome (AGS), which is characterized by interferon (IFN) overproduction and encephalopathy. To date, no model recapitulates AGS encephalopathy, and thus its pathogenesis is not fully understood. In this study, we found that AGS knock-in (KI) mice carrying an AGS-associated K948N point mutation in the Adar1 gene reproduce AGS-like encephalopathy with activation of the RNA sensor MDA5. In addition, the pathological abnormalities found in AGS KI mice were ameliorated by the sole expression of ADAR1 p150, an isoform of ADAR1. Therefore, we comprehensively identified the ADAR1 p150-specific editing sites as potential substrates for MDA5.

Academic Significance and Societal Importance of the Research Achievements

現状ではAGSの治療法は未確立であり、病態解明が急務であるが、これまでAGS症状を再現するモデル動物は確立されていなかった。本研究では、新規に樹立したAdar1遺伝子点変異マウスが、MDA5活性化に起因する脳症を示すことを明らかにした。このため、本マウスを用いることによってAGS病態の解明のみならず、新規治療候補の評価にも活用されることが期待される。

Report

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

    (17 results)

All 2023 2022 2021

All Journal Article (9 results) (of which Peer Reviewed: 5 results,  Open Access: 3 results) Presentation (8 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results)

  • [Journal Article] RNA editing of AZIN1 coding sites is catalyzed by ADAR1 p150 after splicing2023

    • Author(s)
      Xing Yanfang、Nakahama Taisuke、Wu Yuke、Inoue Maal、Kim Jung In、Todo Hiroyuki、Shibuya Toshiharu、Kato Yuki、Kawahara Yukio
    • Journal Title

      Journal of Biological Chemistry

      Volume: 299 Issue: 7 Pages: 104840-104840

    • DOI

      10.1016/j.jbc.2023.104840

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] RNA編集酵素ADAR1による二本鎖RNAセンサーシステムの制御2023

    • Author(s)
      中濱泰祐
    • Journal Title

      臨床免疫・アレルギー科

      Volume: 第80巻第5号 Pages: 599-599

    • Related Report
      2023 Annual Research Report
  • [Journal Article] ウイルス感染症におけるRNA編集の役割2023

    • Author(s)
      中濱泰祐, 河原行郎
    • Journal Title

      臨床免疫・アレルギー科

      Volume: 第80巻第4号 Pages: 427-427

    • Related Report
      2023 Annual Research Report
  • [Journal Article] The RNA-editing enzyme ADAR1: a regulatory hub that tunes multiple dsRNA-sensing pathways2022

    • Author(s)
      Nakahama Taisuke、Kawahara Yukio
    • Journal Title

      International Immunology

      Volume: 35 Issue: 3 Pages: 123-133

    • DOI

      10.1093/intimm/dxac056

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] RNAのイノシン化修飾の破綻はエカルディ・グティエール症候群様症状をひき起こす2022

    • Author(s)
      中濱泰祐、河原行郎
    • Journal Title

      臨床免疫・アレルギー科

      Volume: 第77巻第6号 Pages: 737-743

    • Related Report
      2022 Research-status Report
  • [Journal Article] RNA制御とI型インターフェロノパシー2022

    • Author(s)
      中濱泰祐、河原行郎
    • Journal Title

      実験医学

      Volume: Vol.40 No.15 Pages: 2505-2512

    • Related Report
      2022 Research-status Report
  • [Journal Article] Mutations in the adenosine deaminase ADAR1 that prevent endogenous Z-RNA binding induce Aicardi-Goutieres-syndrome-like encephalopathy2021

    • Author(s)
      Nakahama Taisuke、Kato Yuki、Shibuya Toshiharu、Inoue Maal、Kim Jung In、Vongpipatana Tuangtong、Todo Hiroyuki、Xing Yanfang、Kawahara Yukio
    • Journal Title

      Immunity

      Volume: 54 Issue: 9 Pages: 1976-1988

    • DOI

      10.1016/j.immuni.2021.08.022

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Deciphering the Biological Significance of ADAR1-Z-RNA Interactions2021

    • Author(s)
      Nakahama Taisuke、Kawahara Yukio
    • Journal Title

      International Journal of Molecular Sciences

      Volume: 22 Issue: 21 Pages: 11435-11435

    • DOI

      10.3390/ijms222111435

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] An Aicardi-Goutieres Syndrome-Causative Point Mutation in Adar1 Gene Invokes Multiorgan Inflammation and Late-Onset Encephalopathy in Mice2021

    • Author(s)
      Inoue Maal、Nakahama Taisuke、Yamasaki Ryuichiro、Shibuya Toshiharu、Kim Jung In、Todo Hiroyuki、Xing Yanfang、Kato Yuki、Morii Eiichi、Kawahara Yukio
    • Journal Title

      The Journal of Immunology

      Volume: 207 Issue: 12 Pages: 3016-3027

    • DOI

      10.4049/jimmunol.2100526

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] RNA編集酵素ADAR1による自然免疫制御の新たな展開2023

    • Author(s)
      中濱泰祐
    • Organizer
      The 1st Kansai RNA club
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Rgulatory mechanisms underlying ADAR1 p150-mediated RNA editing2022

    • Author(s)
      Taisuke Nakahama
    • Organizer
      ABZ Meeting 2022 (A, B and Z: The Structure, Function and Genetics of Z-DNA and Z-RNA)
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] ADAR1によるZ型RNAへの結合の破綻はエカルディ-グティエール症候群様脳症を引き起こす2022

    • Author(s)
      中濱泰祐, 河原行郎
    • Organizer
      RNAフロンティアミーティング2022
    • Related Report
      2022 Research-status Report
  • [Presentation] An Aicardi-Goutieres syndrome-causative point mutation in Adar1 gene invokes multi-organ inflammation and late-onset encephalopathy in mice2022

    • Author(s)
      Taisuke Nakahama and Yukio Kawahara
    • Organizer
      第51回日本免疫学会学術集会
    • Related Report
      2022 Research-status Report
  • [Presentation] Immune regulation by RNA editing2022

    • Author(s)
      Taisuke Nakahama
    • Organizer
      第51回日本免疫学会学術集会
    • Related Report
      2022 Research-status Report
  • [Presentation] 自然免疫応答を引き起こすZ型RNAの同定2022

    • Author(s)
      中濱 泰祐
    • Organizer
      OTRI RNA-FS部門第1回シンポジウム
    • Related Report
      2022 Research-status Report
  • [Presentation] Disruption of Z-RNA-binding of ADAR1 induces Aicardi-Goutieres syndrome-like encephalopathy in mice2021

    • Author(s)
      Taisuke Nakahama, Yuki Kato, Toshiharu Shibuya, Maal Inoue, Jung In Kim, Tuangtong Vongpipatana, Hiroyuki Todo, Yanfang Xing, Yukio Kawahara
    • Organizer
      第22回日本RNA学会年会
    • Related Report
      2021 Research-status Report
  • [Presentation] Disruption of Z-RNA-binding of ADAR1 induces Aicardi-Goutieres syndrome-like encephalopathy in mice2021

    • Author(s)
      Taisuke Nakahama, Yukio Kawahara
    • Organizer
      第50回日本免疫学会学術集会
    • Related Report
      2021 Research-status Report

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

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