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Mathematical modeling of HCV-based RNA virus mutation dynamics

Research Project

Project/Area Number 22K15472
Research Category

Grant-in-Aid for Early-Career Scientists

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

Principal Investigator

Ueda Youki  岡山大学, 医歯薬学域, 助教 (90756074)

Project Period (FY) 2022-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2023: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2022: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
KeywordsHCV / C型肝炎ウイルス / 数理化モデル / 長期継代 / 数理モデル / ゲノム / 長期複製 / RNAウイルス / 変異動態
Outline of Research at the Start

C型肝炎ウイルス(HCV)はウイルスゲノムに遺伝子変異が蓄積することが薬剤耐性変異や治癒後の肝発癌の原因と考えられる。しかしながら、遺伝子変異蓄積の多様性にアプローチした研究はあまりなされていない。研究者らは、 HCVの細胞内複製モデルを9年に渡り継代培養し、HCVゲノムは多様性を保ったまま時間依存的に且つ直線的に変異が蓄積増大していくことを最近明らかにした。本研究では、貴重な同モデルを用いて継代0-12年目の各HCVゲノムの変異蓄積を解析することで長期的な変異動態の詳細を明らかにする。さらにそのデータを数理モデル化し、新型コロナウイルスな どを含めたRNAウイルス進化モデルへの応用を目指す。

Outline of Final Research Achievements

In hepatitis C virus (HCV), the accumulation of genetic mutations in the viral genome due to long-term infection and multiplication in the liver is considered to be the cause of drug-resistant mutations and hepatocarcinogenesis after healing. However, it is difficult to maintain HCV persistent infection systems over time, and studies of gene mutation accumulation have been rare because of frequent loss of structural regions and other events. In this study, an intracellular replication model of HCV was passively cultured for 13 years. The HCV genome was analyzed using a third-generation long-read sequencer to reveal the details of long-term mutation dynamics. A mathematical model was created from this data.

Academic Significance and Societal Importance of the Research Achievements

本研究で用いたHCVレプリコン細胞株は申請者が所属する研究室において2002年と2003年に樹立したオリジナルの実験システムであり、HCVゲノムの進化ばかりでなく細胞がん化の要因を探る研究にも役立つと考え、HCVレプリコン細胞樹立時から継代を続けており、世界的にみてもHCVだけでなく他のウイルスでもこのような長期継代培養は皆無であり、今後もこのようなモデルの作成は極めて困難で、非常に貴重なモデルから得られた成果である。そして、この結果はHCVだけでな く他の新規ウイルスに対しても活用が大いに期待できる。

Report

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

    (8 results)

All 2024 2023 Other

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

  • [Journal Article] Stem-like progenitor and terminally differentiated TFH-like CD4+ T cell exhaustion in the tumor microenvironment2024

    • Author(s)
      Zhou W, Kawashima S, Ishino T, Kawase K, Ueda Y, Yamashita K, Watanabe T, Kawazu M, Dansako H, Suzuki Y, Nishikawa H, Inozume T, Nagasaki J, Togashi Y.
    • Journal Title

      Cell Reports

      Volume: - Issue: 2 Pages: 113797-113797

    • DOI

      10.1016/j.celrep.2024.113797

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Low frequency of intracranial progression in advanced NSCLC patients treated with cancer immunotherapies2023

    • Author(s)
      Kemmotsu N , Ninomiya K , Kunimasa K , IshinoT ,Nagasaki J , Otani Y , Michiue H ,Ichihara E ,Ohashi K ,Inoue T ,Tamiya M ,Sakai K ,Ueda Y , Dansako H ,Nishio K ,Kiura K , Date I ,Togashi Y
    • Journal Title

      International Journal of Cancer

      Volume: 154(1) Issue: 1 Pages: 169-179

    • DOI

      10.1002/ijc.34700

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Combination therapy with hydrogen peroxide and irradiation promotes an abscopal effect in mouse models2023

    • Author(s)
      Kemmotsu N , Zhu L , Nagasaki J , Otani Y , Ueda Y , Dansako H , Fang Y , Date I , Togashi Y
    • Journal Title

      Cancer Science

      Volume: 114(10) Issue: 10 Pages: 3848-3856

    • DOI

      10.1111/cas.15911

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Activated CTLA‐4‐independent immunosuppression of Treg cells disturbs CTLA‐4 blockade‐mediated antitumor immunity2023

    • Author(s)
      Watanabe T、Ishino T、Ueda Y、Nagasaki J、Sadahira T、Dansako H、Araki M、Togashi Y
    • Journal Title

      Cancer Science

      Volume: In press Issue: 5 Pages: 1859-1870

    • DOI

      10.1111/cas.15756

    • Related Report
      2023 Annual Research Report 2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Somatic mutations can induce a noninflamed tumour microenvironment via their original gene functions, despite deriving neoantigens2023

    • Author(s)
      Ishino Takamasa、Kawashima Shusuke、Tanji Etsuko、Ueno Toshihide、Ueda Youki、Ogasawara Sadahisa、Sato Kazuhito、Mano Hiroyuki、Ishihara Soichiro、Kato Naoya、Kawazu Masahito、Togashi Yosuke
    • Journal Title

      British Journal of Cancer

      Volume: 128 Issue: 6 Pages: 1166-1175

    • DOI

      10.1038/s41416-023-02165-6

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Remarks] 研究者の所属研究室のHP

    • URL

      https://www.cc.okayama-u.ac.jp/tme/uedayouki.html

    • Related Report
      2023 Annual Research Report
  • [Remarks] Researchmap

    • URL

      https://researchmap.jp/youki-ueda

    • Related Report
      2023 Annual Research Report
  • [Remarks] 研究室のホームページ

    • URL

      http://www.okayama-u.ac.jp/user/med/dmb/index.html

    • Related Report
      2022 Research-status Report

URL: 

Published: 2022-04-19   Modified: 2025-01-30  

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