METTL3-eIF3hによるmRNA循環は,翻訳を強化し,腫瘍生成を促進する
Junho Choe1,2, Shuibin Lin1,2,3, Wencai Zhang4
1Stem Cell Program, Division of Hematology/Oncology, Boston Children's Hospital, Boston, MA, USA.
Nature
|September 21, 2018
まとめ
メチルトランスフェラーゼのような3 (METTL3) タンパク質は,ループメカニズムを通じてmRNA翻訳を強化し,腫瘍性変異を促進します. METTL3-eIF3hの相互作用をターゲットにすることで,新しいがん治療戦略が提供される可能性があります.
科学分野:
- 分子生物学
- 遺伝子発現の規制
- 癌 生物学
背景:
- N6-メチラデノシン (m6A) mRNAの改変は,がんに関与する遺伝子発現の重要な調節因子である.
- METTL3は,特にストップコドンの近くで,m6Aの改変を触媒化し,そのメカニズムは不明であるが,翻訳に影響することが知られている.
研究 の 目的:
- METTL3がmRNA翻訳を強化するメカニズムを解明する.
- がん,特に肺腫瘍におけるMETTL3の機能的関連性を調査する.
- METTL3の機能に基づいてがん治療の潜在的治療標的を特定する.
主な方法:
- レポーターmRNAアッセイは,METTL3が結合されたときの翻訳効果を研究する.
- 電子顕微鏡でポリリボソームのトポロジーとタンパク質の相互作用を視覚化します.
- METTL3と翻訳因子の間の物理的な相互作用を特定するための共免疫プレシピテーション.
- 人間の肺腫瘍におけるm6A型腫瘍性mRNAの分析
主要な成果:
- METTL3は5'キャップ結合タンパク質との相互作用を伴うストップコドン付近のmRNAループを通じて翻訳を強化する.
- METTL3とエウカリオット翻訳開始因子3 (eIF3h) の間の直接的な物理的および機能的相互作用が特定されました.
- METTL3は,肺腫瘍におけるBRD4を含む腫瘍性mRNAの翻訳を促進し,腫瘍性変異を誘発する.
- METTL3の減少は腫瘍の成長を阻害し,BRD4阻害剤に対する感受性を高めます.
結論:
- METTL3は,eIF3hとの相互作用を含む翻訳を制御するmRNAループメカニズムを使用しています.
- このMETTL3- eIF3h経路は,腫瘍性mRNAの翻訳と肺がんの変容に不可欠です.
- METTL3- eIF3hの相互作用は,がん治療における有望な治療目標です.
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