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Functional analysis of microRNAs in SARS-CoV-2 propagation

Research Project

Project/Area Number 21K07039
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 49060:Virology-related
Research InstitutionOsaka University

Principal Investigator

Ono Chikako  大阪大学, 感染症総合教育研究拠点, 特任准教授(常勤) (30626437)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2023: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
KeywordsSARS-CoV-2 / siRNA / 5’UTR / miRNA
Outline of Research at the Start

マイクロRNAの生合成に必須な宿主因子であるDicerまたはDrosha遺伝子を欠損させたヒト由来のSARS-CoV-2感染許容細胞株を樹立することによって、SARS-CoV-2増殖におけるマイクロRNAの意義を検討する。さらに、ウイルスゲノムに結合しうるマイクロRNAをスクリーニングにより同定し、宿主側の遺伝子発現変動と比較しながら、そのウイルス増殖への影響と詳細な分子機構を解明する。

Outline of Final Research Achievements

In this study, we found that three siRNAs targeting SL1, SL2, SL3, and SL5 of the stem-loop (SL) structures in the 5'UTR of SARS-CoV-2 have an inhibitory effect on viral propagation. The inhibitory mechanism is suggested to be viral genome RNA degradation, and the inhibitory effect was observed against various epidemic strains of SARS-CoV-2 and SARS-CoV. In addition, the inhibitory effect was also observed when treated with siRNA at post-infection. On the other hand, during serial passages of SARS-CoV-2 in the presence of each siRNA, resistant mutants were obtained, respectively, but all of them had reduced virus production efficiency, and the introduced mutations were detected in small amounts in the public database but were not maintained, suggesting that they are not advantageous mutations for viral propagation.

Academic Significance and Societal Importance of the Research Achievements

本研究で得られた3つのsiRNAは、標的部位がSARS-CoV-2のみならずSARS-CoVを含めたサルベコウイルス属でも保存されており、いずれに対しても抑制効果が認められたため、今後出現しうるサルベコウイルス属から派生した新興・再興ウイルスに対しても有効であることが期待される。またこのようなウイルス増殖にとって重要な保存性の高い領域を標的とすることは、有効なウイルス治療戦略となると考えられる。
またウイルス感染後にsiRNAを導入しても抑制効果が認められたことから、ウイルスゲノムを直接標的とする新規SARS-CoV-2治療法の開発につながると期待される。

Report

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

    (8 results)

All 2024 2023 2022 2021

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (7 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results)

  • [Journal Article] Characterization of a neutralizing antibody that recognizes a loop region adjacent to the receptor-binding interface of the SARS-CoV-2 spike receptor-binding domain.2024

    • Author(s)
      Anzai I, Fujita J, Ono C, Kosaka Y, Miyamoto Y, Shichinohe S, Takada K, Torii S, Taguwa S, Suzuki K, Makino F, Kajita T, Inoue T, Namba K, Watanabe T, Matsuura Y
    • Journal Title

      Microbiol Spectr.

      Volume: 12 Issue: 4

    • DOI

      10.1128/spectrum.03655-23

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Suppression of SARS-CoV-2 propagation by siRNA targeting the stem-loop structures in the 5'UTR2023

    • Author(s)
      Chikako Ono, Masanao Sato, Kentaro Uemura, Junki Hirano, Shuhei Taguwa, Yoshiharu Matsuura
    • Organizer
      The 21st Awaji International Forum on Infection and Immunity
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Suppression of SARS-CoV-2 propagation by siRNA targeting the stem-loop structures in the 5'UTR2023

    • Author(s)
      Chikako Ono, Masanao Sato, Kentaro Uemura, Junki Hirano, Shuhei Taguwa, Yoshiharu Matsuura
    • Organizer
      Annual Meeting of the American Society for Virology 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 新型コロナウイルスの進化と変異株2022

    • Author(s)
      小野慎子
    • Organizer
      第94回 日本遺伝学会公開市民講座「次々と現れる新型コロナウイルス変異株の進化遺伝学」
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] SARS-CoV-2 5’UTRのstem-loop構造を標的としたsiRNAによるウイルス増殖抑制2022

    • Author(s)
      小野慎子, 上村健太朗,田鍬修平,森寛行,小比賀 聡,松浦善治
    • Organizer
      第69回日本ウイルス学会学術集会
    • Related Report
      2022 Research-status Report
  • [Presentation] C型肝炎ウイルスとマイクロ RNA2022

    • Author(s)
      小野 慎子
    • Organizer
      令和3年度「感染・免疫・がん・炎症」全国共同研究拠点シンポジウム
    • Related Report
      2021 Research-status Report
  • [Presentation] SARS-CoV-2 の増殖における5’UTRのstem-loop構造の役割2021

    • Author(s)
      Chikako Ono,Shiho Torii,Rahmi Deanty,Shuhei Taguwa,Yoshiaru Matsuura
    • Organizer
      第68回日本ウイルス学会
    • Related Report
      2021 Research-status Report
  • [Presentation] Characterization of mutation in the 5’UTR of HCV in miR-122-dependent propagation2021

    • Author(s)
      Chikako Ono, Takasuke Fukuhara, Shiho Torii, Itsuki Anzai, Rigel Suzuki, Yuzy Fauzyah, Yuhei Morioka, Yoshiharu Matsuura
    • Organizer
      HCV2021 VIRTUAL
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

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

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