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Analysis of the molecular mechanism of IgH gene diversification depending on RNA-editing by AID

Research Project

Project/Area Number 19H01027
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Review Section Medium-sized Section 49:Pathology, infection/immunology, and related fields
Research InstitutionKyoto University

Principal Investigator

HONJO TASUKU  京都大学, 高等研究院, 特別教授 (80090504)

Co-Investigator(Kenkyū-buntansha) 小林 牧  京都大学, 医学研究科, 特定准教授 (20400690)
Begum NasimAra  京都大学, 医学研究科, 特定准教授 (80362507)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥45,890,000 (Direct Cost: ¥35,300,000、Indirect Cost: ¥10,590,000)
Fiscal Year 2021: ¥13,260,000 (Direct Cost: ¥10,200,000、Indirect Cost: ¥3,060,000)
Fiscal Year 2020: ¥13,260,000 (Direct Cost: ¥10,200,000、Indirect Cost: ¥3,060,000)
Fiscal Year 2019: ¥19,370,000 (Direct Cost: ¥14,900,000、Indirect Cost: ¥4,470,000)
KeywordsAID / RNA編集 / 免疫グロブリン遺伝子 / トポイソメラーゼ 1 / トポイソメラーゼ1 / トポイソメラーゼ 1
Outline of Research at the Start

本研究は免疫記憶の根幹をなす、免疫グロブリン遺伝子の多様化[体細胞突然変異(SHM)とクラススイッチ(CSR)]の分子メカニズム解明を目的とする。Activation-induced cytidine deaminase (AID)はSHMとCSRに必須である。AIDによりDNA切断と修復段階においてそれぞれmiRNA及びmRNAのRNA編集の結果DNAの切断と修復が行われると予想される。DNA切断を行うトポイソメラーゼ1(Top1)の制御を通じてAIDによるRNA編集とDNA切断切断メカニズムを証明する。一方、AID依存的なESPN mRNA 編集がDNA修復において果たす機能を解明する。

Outline of Final Research Achievements

We analyzed the molecular function of AID, which supports the diversification of antibody genes. Analysis of the translational repression mechanism of DNA topoisomerase 1 (Top1) which alters the secondary structure of DNA revealed that AID activation promotes miRNA-Ago2 complex binding to Top1 mRNA (particularly to 3'UTR). We have demonstrated that the function of AID during the DNA cleavage step is through the control of miRNA complex.
Furthermore, when we explored the possibility of RNA editing for the repair stage of class switch recombination that depends on the C-terminal domain of AID, we discovered a new molecular mechanism of the repair stage which depends on the protein binding to the C-terminal domain of AID.

Academic Significance and Societal Importance of the Research Achievements

AIDの発見以来、20余年間、AIDの標的RNA分子を探索し、初めてmiRNAを通じたmRNAの制御がDNA切断を促進するという新しい分子メカニズムを明らかにした。抗体遺伝子組換えはワクチンを始めとする感染性制御の根幹を成す生命システムであり、その謎について新発見を得た。

Report

(5 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Annual Research Report
  • 2019 Comments on the Screening Results   Annual Research Report
  • Research Products

    (11 results)

All 2021 2020 2019 Other

All Journal Article (4 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 4 results,  Open Access: 4 results) Presentation (5 results) (of which Int'l Joint Research: 1 results,  Invited: 5 results) Remarks (2 results)

  • [Journal Article] Phf5a regulates DNA repair in class switchrecombination via p400 and histone H2Avariant deposition2021

    • Author(s)
      Nasim A Begum, Farazul Haque, Andre Stanlie, Afzal Husain, Samiran Mondal, Mikiyo Nakata, Takako Taniguchi, Hisaaki Taniguchi, Tasuku Honjo
    • Journal Title

      EMBO J

      Volume: e106393 Issue: 12 Pages: 1-21

    • DOI

      10.15252/embj.2020106393

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] RNA-binding motifs of hnRNP K are critical for induction of antibody diversification by activation-induced cytidine deaminase2020

    • Author(s)
      Ziwei Yin, iMaki Kobayashi, Wenjun Hu, Koichi Higashi, Nasim A Begum, Ken Kurokawa, Tasuku Honjo
    • Journal Title

      Proceedings of the National Academy of Sciences of the United States of America

      Volume: in press Issue: 21 Pages: 11624-11635

    • DOI

      10.1073/pnas.1921115117

    • Related Report
      2020 Annual Research Report 2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] SAMHD 1‐mediated dNTP degradation is required for efficient DNA repair during antibody class switch recombination2020

    • Author(s)
      Husain Afzal、Xu Jianliang、Fujii Hodaka、Nakata Mikiyo、Kobayashi Maki、Wang Ji‐Yang、Rehwinkel Jan、Honjo Tasuku、Begum Nasim A
    • Journal Title

      The EMBO Journal

      Volume: 39 Issue: 15

    • DOI

      10.15252/embj.2019102931

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Antibody class switch recombination requires SAMHD1-mediated dNTP degradation to promote DNA repair2020

    • Author(s)
      Afzal Husain, Jiangling Xu, Hodaka Fuji, Mikiyo Nakata, Kobayashi Maki, Ji- Yang Wang, Jan Rehwinkel, Tasuku Honjo, Nasim A. Begum
    • Journal Title

      EMBO J.

      Volume: under revision

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] DNAトポイソメラーゼ1は免疫グロブリン遺伝子組換え(多様化)に際してAIDに制御されDNA切断に働く2019

    • Author(s)
      小林 牧、本庶 佑
    • Organizer
      第42回日本分子生物学会年会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Serendipities of acquired immunity2019

    • Author(s)
      Tasuku Honjo
    • Organizer
      IUIS 2019 (17th International Conference of Immunology)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 獲得免疫の驚くべき幸運2019

    • Author(s)
      本庶 佑
    • Organizer
      第52回日本薬剤師会学術大会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] 獲得免疫の驚くべき幸運(Serendipities of acquired immunity)2019

    • Author(s)
      本庶 佑
    • Organizer
      第78回日本癌学会学術総会コアシンポジウム講演
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Serendipities of acquired immunity2019

    • Author(s)
      本庶 佑
    • Organizer
      第119回日本外科学会定期学術集会 特別講演
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Remarks] 京都大学大学院医学研究科 免疫ゲノム医学

    • URL

      http://www2.mfour.med.kyoto-u.ac.jp/

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
  • [Remarks] 京都大学大学院医学研究科 免疫ゲノムj医学

    • URL

      http://www2.mfour.med.kyoto-u.ac.jp/

    • Related Report
      2019 Annual Research Report

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Published: 2019-04-18   Modified: 2023-01-30  

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