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Transcription-dependent IgH gene instability by RNA interference

Research Project

Project/Area Number 19K06485
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 43010:Molecular biology-related
Research InstitutionKyoto University

Principal Investigator

Kobayashi Maki  京都大学, 医学研究科, 特定准教授 (20400690)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
KeywordsRNA干渉 / 抗体遺伝子組換え / アンチセンスオリゴ / ゲノム不安定化 / AID / 核内転写活性化領域 / IgH遺伝子 / aicda / germline transcripts / 抗体遺伝子 / 転写依存的ゲノム不安定性 / トポイソメラーゼ1
Outline of Research at the Start

本研究は、免疫グロブリン(抗体)遺伝子の「転写依存的な脆弱ゲノム領域の分子構造的特性」を明らかにする。申請者は抗体遺伝子組換え領域から転写されるnoncoding RNAの機能検証中、ncRNAをノックダウンする数種類のRNA干渉(RNAi) アンチセンスオリゴ修飾核酸導入後に抗体遺伝子のクラススイッチ組換え効率が上昇する特異な現象を発見した。本研究では、抗体遺伝子座に備わる転写依存的ゲノム脆弱性の特徴を解明し、抗体遺伝子が計画的に組換えられる仕組みの理解、さらに転写依存性DNA変異に共通するメカニズムの詳細に迫る。さらに本研究は、抗体遺伝子以外に潜在する脆弱ゲノム領域の予測にも寄与する。

Outline of Final Research Achievements

We have newly discovered that retrotransposon-derived RNA is important as the nuclear environment essential for DNA cleavage. An entirely new method for evaluating the recombination kinetics of an antibody gene was attempted by the RNA-FISH method using a probe for antibody gene noncoding RNA. RNA derived from the Alu sequence is essential for the regulation of nuclear structure, but it is important for the formation of RNA concentrate at the antibody gene recombination site. hnRNP K, which is essential for DNA cleavage, controles the localization of the antibody gene in the transcription-active region in the nucleus. We also newly found that an RNA-binding protein that bind to the repetitive RNA are essential for the DNA cleavage stage of AID-dependent antibody gene recombination.

Academic Significance and Societal Importance of the Research Achievements

抗体遺伝子noncoding RNAが濃縮体を形成し、DNA切断や修復の場を与える可能性を見出した。これらの独自性の高い発見が、さらに抗体遺伝子が組換え時に特別な核内環境を要求する条件を特定する契機になると期待される。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (3 results)

All 2020 2019

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (1 results) (of which Invited: 1 results)

  • [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 Research-status Report 2019 Research-status 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 Research-status 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 Research-status Report
    • Invited

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Published: 2019-04-18   Modified: 2023-12-25  

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