プリオンのようなドメインによるBAF複合体の癌特異的な再ターゲティング
Gaylor Boulay1, Gabriel J Sandoval2, Nicolo Riggi3
1Department of Pathology, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114, USA; Broad Institute of Harvard and MIT, Cambridge, MA 02142, USA; Center for Cancer Research, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA 02129, USA.
Cell
|August 29, 2017
まとめ
BRG1/ BRM関連因子 (BAF) 複合体は,EWS- FLI1融合タンパク質によって誘発され,ユーイング肉腫におけるEWSR1と相互作用する. EWSR1のプリオンのようなドメインは,腫瘍性遺伝子の活性化のためにBAF複合体を勧誘する鍵です.
科学分野:
- 腫瘍学
- 分子生物学
- エピジェネティクス
背景:
- 転写調節因子の変化が 癌の遺伝子発現を誘導する
- BRG1/BRM関連因子 (BAF) 染色体改造複合体はヒト腫瘍で頻繁に変異する.
- EWSR1は,プリオンのようなドメインを持つタンパク質で,腫瘍性合併のパートナーです.
研究 の 目的:
- BAF複合体とEWSR1がユーイング肉腫における役割を調査する.
- EWS-FLI1融合タンパク質がこれらの成分をどのように利用するかを決定する.
- 腫瘍遺伝子の活性化メカニズムを解明する.
主な方法:
- BAF複合体の標的を特定するためのクロマチンの免疫降水.
- EWS-FLI1融合タンパク質の相互作用の分析
- EWSR1プリオン型ドメインのチロシン残基の変異分析
- EWSR1-FLI1融合断片を用いた機能研究
主要な成果:
- BAF複合体は,EWS-FLI1によって,ユーイング肉腫の腫瘍特異増強剤に誘発される.
- BAFの募集は,EWS-FLI1のネオモルフな機能である腫瘍性標的遺伝子の活性化につながる.
- EWSR1プリオン型ドメインのチロシン残留は,BAF複合リターゲティングと相変異に不可欠です.
- FLI1に融合した短いEWSR1断片は,EWS-FLI1の活動を再現することができます.
結論:
- EWSR1のプリオンのようなドメインの物理的特性は,BAF染色体再構成複合体の再ターゲティングを可能にします.
- この再ターゲティングは,ユーイング・サーコマにおける腫瘍性遺伝子発現プログラムの確立と維持に不可欠である.
- プリオンのようなドメインは,がんにおけるクロマチン調節体の機能を決定する.
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