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The elucidation of the mechanism of multi-step hepatocarcinogenesis via whole genome sequence and organoid culture technology

Research Project

Project/Area Number 19K08443
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 53010:Gastroenterology-related
Research InstitutionKyoto University

Principal Investigator

Takai Atsushi  京都大学, 医学研究科, 助教 (80760587)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords肝細胞癌 / 全ゲノム解析 / 全ゲノムシーケンス / ゲノム解析 / オルガノイド培養
Outline of Research at the Start

本研究では、乏血性の高分化型肝細胞癌の一部がさらに悪性化し、多血性結節を形成した「結節内結節型肝細胞癌」と呼ばれる病変に着目する。結節内結節型肝細胞癌組織の乏血性病変・多血性病変からサンプルを採取し、全ゲノム解析を行うことによって、多段階発癌に重要なゲノム異常の同定を試みる。また、採取したサンプルからオルガノイド培養によりsingle cell由来のクローンを樹立し、各クローンの特徴についてトランスクリプトーム解析などにより評価する。

Outline of Final Research Achievements

In the current study, we demonstrated the genetic landscape of multistep carcinogenesis in NIN-HCCs through comprehensive genetic analysis with multiregional WGS. We found that well-differentiated HCC already bears various genetic aberrations including point mutations,not only point mutations but also STVs and hypermethylation of the TERT promoter region occurred as the trunk events in HCC, indicating that cellular immortalization by TERT aberration
could be the key driver event in the initiation step of hepatocarcinogenesis.In addition, in the progression phase of hepatocarcinogenesis, a particular tumor cell among the immortalized cellular population newly acquires several genetic aberrations involved in some oncogenic pathways and evolves from slow growing
tumor cells to rapid-growing malignant cells, resulting in the formation of an inner aggressive HCC nodule.

Academic Significance and Societal Importance of the Research Achievements

本研究により、肝発癌の初期にはTERT遺伝子異常が必須である一方で、肝癌の進行期には多様な遺伝子異常や分子経路の異常が関与することが分かった。本研究により、多段階発癌の分子生物学的メカニズムの一端が解明された。本研究成果を基盤として、TERTを標的とした分子標的治療や、症例によって異なる遺伝子異常をターゲットとしたオーダーメイドの分子標的治療の開発につながることが期待される。

Report

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

    (5 results)

All 2022 2021 2020 2019

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (3 results)

  • [Journal Article] Genetic Landscape of Multistep Hepatocarcinogenesis2022

    • Author(s)
      Takeda Haruhiko、Takai Atsushi、Eso Yuji、Takahashi Ken、Marusawa Hiroyuki、Seno Hiroshi
    • Journal Title

      Cancers

      Volume: 14 Issue: 3 Pages: 568-568

    • DOI

      10.3390/cancers14030568

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Multiregional whole‐genome sequencing of hepatocellular carcinoma with nodule‐in‐nodule appearance reveals stepwise cancer evolution2020

    • Author(s)
      Takeda Haruhiko、Takai Atsushi、Kumagai Ken、Iguchi Eriko、Arasawa Soichi、Eso Yuji、Shimizu Takahiro、Ueda Yoshihide、Taura Kojiro、Uemoto Shinji、Kita Ryuichi、Haga Hironori、Marusawa Hiroyuki、Fujimoto Akihiro、Seno Hiroshi
    • Journal Title

      The Journal of Pathology

      Volume: 252 Issue: 4 Pages: 398-410

    • DOI

      10.1002/path.5533

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] 多段階発癌におけるミスマッチ修復異常関連体細胞変異シグネチャーの抽出2021

    • Author(s)
      竹田治彦、高井淳、恵荘裕嗣、高橋健、田浦康二朗、波多野悦朗、喜多竜一、丸澤宏之、藤本明洋、妹尾浩
    • Organizer
      第24回日本肝がん分子標的治療研究会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 全ゲノムシーケンスを用いた多段階肝発癌過程の包括的解析2020

    • Author(s)
      竹田治彦、高井淳、妹尾浩
    • Organizer
      第56回日本肝臓学会総会
    • Related Report
      2020 Research-status Report
  • [Presentation] 全ゲノムシーケンス解析を用いた結節内結節型肝癌の病理像とゲノム異常の比較解析2019

    • Author(s)
      竹田治彦、高井淳、妹尾浩.
    • Organizer
      JDDW2019
    • Related Report
      2019 Research-status Report

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

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