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Development of a new gallbladder cancer mouse model using CRISPR-Cas9 system to evaluate the effect of personalized therapy

Research Project

Project/Area Number 20K22816
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0901:Oncology and related fields
Research InstitutionKyushu University

Principal Investigator

Ideno Noboru  九州大学, 医学研究院, 助教 (90883421)

Project Period (FY) 2020-09-11 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
KeywordsGallbladdre cancer / CRISPR-Cas9 system / 胆嚢癌 / ゲノム編集 / マウスモデル / 個別化医療
Outline of Research at the Start

胆嚢癌は生物学的悪性度が高いため,癌遺伝子情報に基づいた効果的な”precision medicine”の開発が急務である.胆嚢癌には併存する複数の仮想的driver遺伝子がある.これらが併存した場合の各遺伝子変異の機能が明らかではないため,遺伝子変異を標的とした治療の有効性を検証するためには,同じ組み合わせの仮想的driver遺伝子を持つpre-clinical modelが必要である.CRISPR/Cas9 systemによる遺伝子改変マウスモデル作成法を応用して,ヒト胆嚢癌と同じく複数の仮想的driver遺伝子変異を持ち,短期間で胆嚢上皮より自然発生する胆嚢癌マウスモデルを作成する.

Outline of Final Research Achievements

We developed a transgenic mouse model Krt19-CreERT; LSL-Cas9, specifically expressing Cas9 in biliary epithelium. Based on available public data, we selected KRAS, TP53, SMAD4 as frequent drivers for gallbladder cancer. As potential therapeutic target, CDKN2A was added to 2 drivers, KRAS/TP53, or SMAD4/TP53. We designed guide RNA to induce gain-of-function mutations in these drivers. After confirmation that each guide RNA worked for genome editing in vitro study, guide RNAs for 2 or 3 driver genes were cloned into AAV vector and generated and purified AAV. The completed works for this study were development of CK19-Cas9 mouse model and generation of AAV containing guide RNA for 2 or 3 driver genes. We are starting injection of AAV into gallbladder of Krt19-CreERT; LSL-Cas9 mice once sufficient number of mice is available, and evaluating phenotypic difference according to edited drivers.

Academic Significance and Societal Importance of the Research Achievements

胆嚢癌には併存する複数の仮想的driver遺伝子がある.これらが併存した場合の各遺伝子変異の機能が明らかではないため,遺伝子変異を標的とした治療の有効性を検証するためには,同じ組み合わせの仮想的driver遺伝子を持つpre-clinical modelが必要である.申請者が開発中のCRISPR/Cas9 systemによる胆嚢癌遺伝子改変マウスモデルを応用して,ヒト胆嚢癌の遺伝子情報に基づいて癌を自然発生させたモデルを短期間で作成し,分子標的薬の効果を予測することで,それぞれの患者により効率的な治療を提供できる可能性があり,予後不良な胆嚢癌の治療成績向上に大きく寄与すると考えられる.

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report

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Published: 2020-09-29   Modified: 2024-01-30  

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