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Control of hepatitis B virus genomic replication and maintenance by E2F transfription factors

Research Project

Project/Area Number 17K08871
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Virology
Research InstitutionTokyo Metropolitan Institute of Medical Science

Principal Investigator

MUNAKATA Tsubasa  公益財団法人東京都医学総合研究所, 疾患制御研究分野, 主席研究員 (50420237)

Project Period (FY) 2017-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords肝炎 / B型肝炎ウイルス / E2F1 / 転写因子 / エンハンサー / HBV / プロモーター / E2F / cccDNA / ウイルス / B型肝炎 / cccDNA
Outline of Final Research Achievements

Detailed genomic analysis identified 5 putative E2F1-binding sites in the HBV DNA. Interestingly, these sites were conserved among all the HBV genotypes. We also found that knockdown of E2F1 suppressed the expression of HBV X protein (HBx) and surface protein (HBs), strongly suggesting that E2F family transcription factors regulate HBV replication and infection. A E2F1-binding site located in the Enhancer I region of HBV genome was shown to interact with E2F1, which in turn activated the transcription of HBx mRNA. Since the first mRNA expressed upon HBV infection is that of HBx, our findings revealed the critical point in the HBV life cycle.

Academic Significance and Societal Importance of the Research Achievements

HBVによる持続感染者は世界で2億人以上おり、HBVは世界的に重大な健康問題の原因の一つである。ワクチン、インターフェロン、核酸アナログ製剤の開発により、新規の感染者は減少しHBV由来の肝臓病の発症も抑制されてきた。しかし、現行のいずれの治療法も、HBVのゲノムを完全排除できない。このゲノムからHBV mRNAが転写されてウイルス遺伝子の発現が続く限り、HBV感染は持続してB型肝炎が再発する場合もある。E2F1がゲノム安定性に必要であることを考慮すると、HBVのゲノムDNAの肝細胞での維持にE2F1が関与することが考えられる。従って我々の発見はHBV感染の新たな治療法の開発に繋がる。

Report

(5 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (11 results)

All 2019 2018 2017 Other

All Journal Article (2 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (6 results) (of which Int'l Joint Research: 3 results) Remarks (1 results) Patent(Industrial Property Rights) (2 results) (of which Overseas: 1 results)

  • [Journal Article] Ribonucleotide reductase M2 promotes RNA replication of hepatitis C virus by protecting NS5B protein from hPLIC1-dependent proteasomal degradation.2019

    • Author(s)
      Kitab B, Satoh M, Ohmori Y, Munakata T, Sudoh M, Kohara M, Tsukiyama-Kohara K.
    • Journal Title

      J Biol Chem

      Volume: 294 Issue: 15 Pages: 5759-5773

    • DOI

      10.1074/jbc.ra118.004397

    • Related Report
      2019 Research-status Report 2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Sato Y, Matsui H, Yamamoto N, Sato R, Munakata T, Kohara M, Harashima H. Highly specific delivery of siRNA to hepatocytes circumvents endothelial cell-mediated lipid nanoparticle-associated toxicity leading to the safe and efficacious decrease in the hepatitis B virus2017

    • Author(s)
      Sato Y, Matsui H, Yamamoto N, Sato R, Munakata T, Kohara M, Harashima H
    • Journal Title

      J Control Release

      Volume: 266 Pages: 216-225

    • DOI

      10.1016/j.jconrel.2017.09.044

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] Enhancement of hepatitis B virus replication by a microRNA targeting pregenomic RNA2019

    • Author(s)
      Tsubasa Munakata, Takahiro Sanada, Naoki Yamamoto, Michinori Kohara
    • Organizer
      International HBV Meeting and Associated Meetings (Melbourne, Australia)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] B型肝炎ウイルスの複製を促進するマイクロRNAはプレゲノムRNAを標的とする2019

    • Author(s)
      Tsubasa Munakata, Takahiro Sanada, Naoki Yamamoto, Michinori Kohara
    • Organizer
      第67回日本ウイルス学会学術集会 (タワーホール船堀、東京)
    • Related Report
      2019 Research-status Report
  • [Presentation] Regulation of the transcription of hepatitis B virus by E2F12018

    • Author(s)
      Tsubasa Munakata(口頭発表), Michinori Kohara
    • Organizer
      第66回日本ウイルス学会学術集会
    • Related Report
      2018 Research-status Report
  • [Presentation] Enhancement of hepatitis B virus replication by a microRNA targeting pregenomic RNA2018

    • Author(s)
      Tsubasa Munakata(ポスター発表), Takahiro Sanada, Naoki Yamamoto, Michinori Kohara
    • Organizer
      2018 International HBV Meeting -The Molecular Biology of Hepatitis B Viruses-
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Control of hepatitis B virus replication by microRNAs regulated by the in vivo infection2017

    • Author(s)
      Tsubasa Munakata, Takahiro Sanada, Naoki Yamamoto, Michinori Kohara
    • Organizer
      第65回日本ウイルス学会学術集会
    • Related Report
      2017 Research-status Report
  • [Presentation] Control of hepatitis B virus replication by microRNAs regulated by the in vivo infection2017

    • Author(s)
      Tsubasa Munakata, Takahiro Sanada, Naoki Yamamoto, Michinori Kohara
    • Organizer
      2017 International HBV Meeting “Molecular Biology of Hepatitis B Viruses” and Satellite Symposium
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Remarks] 公益財団法人 東京都医学総合研究所 疾患制御研究分野 感染制御プロジェクト HP

    • URL

      http://www.igakuken.or.jp/infectious/index.html#2

    • Related Report
      2019 Research-status Report
  • [Patent(Industrial Property Rights)] B型肝炎ウイルスの複製阻害組成物2019

    • Inventor(s)
      棟方翼(40%)、真田崇弘(20%)、小原道法(40%)
    • Industrial Property Rights Holder
      公益財団法人東京都医学総合研究所
    • Industrial Property Rights Type
      特許
    • Filing Date
      2019
    • Related Report
      2019 Research-status Report
    • Overseas
  • [Patent(Industrial Property Rights)] B型肝炎ウイルスの複製阻害組成物2018

    • Inventor(s)
      棟方翼(40%)、真田崇弘(20%)、小原道法(40%)
    • Industrial Property Rights Holder
      公益財団法人東京都医学総合研究所
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2018-215898
    • Filing Date
      2018
    • Related Report
      2018 Research-status Report

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Published: 2017-04-28   Modified: 2022-01-27  

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