WRNヘリケーズは,マイクロサテライトの不安定な癌における合成的致死標的である
Edmond M Chan1,2, Tsukasa Shibue1, James M McFarland1
1Broad Institute of Harvard and MIT, Cambridge, MA, USA.
Nature
|April 12, 2019
まとめ
合成の致死性は 癌治療の遺伝的脆弱性を利用しています 研究者らは,WRNタンパク質は微小衛星不安定性 (MSI) の癌細胞にとって不可欠であり,薬剤の標的となる可能性があることを発見しました.
科学分野:
- 腫瘍学
- 遺伝学
- 分子生物学
背景:
- 致死性の合成は 遺伝的脆弱性をターゲットにすることで 癌治療の有望な戦略です
- 癌ではDNA修復経路の欠乏が一般的であり,特定の修復タンパク質に依存する.
- 複合ADPリボースポリメラーゼ1 (PARP-1) 阻害剤は,同種の再結合欠乏性がんにおいて成功している.
研究 の 目的:
- マイクロサテライト不安定性 (MSI) が発症するがんの合成致死標的を特定する.これはDNAミスマッチ修復の欠陥から生じる.
- DNA修復タンパク質に対するMSIがんの依存性を調査する.
主な方法:
- CRISPR-Cas9ノックアウトとRNA干渉を用いた大規模サイレンススクリーンの分析.
- WRN (RecQ DNAヘリケーズ) 依存性の評価 in vitroおよびin vivoでMSIおよびマイクロサテライトに安定したがんモデル.
- MSIがんモデルにおけるWRNのヘリケーゼおよびエクソヌクレアゼ活動に関する評価
主要な成果:
- WRNはMSIがんモデルでは選択的に不可欠であるが,マイクロサテライト安定モデルでは不要である.
- WRNの枯渇は,特にMSIモデルにおいて,二重鎖DNAの断裂,アポトーシス,および細胞サイクル停止を引き起こした.
- MSIがんモデルでは,WRNのヘリコース活性が必要でしたが,エクソヌクレアース活性はありませんでした.
結論:
- WRNはMSIがんにおける 合成の致命的な脆弱性を表しています
- WRNは,MSIがんの治療のための潜在的な薬物のターゲットです.
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