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SMAD2/3インタラクトームは,TGFβがm6Aメチル化をプラリポテンシーで制御することを明らかにする
Alessandro Bertero1, Stephanie Brown1, Pedro Madrigal1,2
1Wellcome Trust-MRC Cambridge Stem Cell Institute, Anne McLaren Laboratory and Department of Surgery, University of Cambridge, Cambridge CB2 0SZ, UK.
Nature
|March 1, 2018
まとめ
変形成長因子β (TGFβ) 信号は,SMAD2/3タンパク質を通じて細胞運命を調節する. この研究では,SMAD2/3がm6Aメチルトランスフェラーゼ複合体と相互作用し,RNAの安定性と細胞の分化に影響を与えることを明らかにした.
科学分野:
- 細胞生物学
- 分子生物学
- 発達生物学
背景:
- 変形成長因子β (TGFβ) 経路は,胚の発達,組織ホメオスタシス,および疾患に不可欠です.
- SMAD2とSMAD3 (SMAD2/3) は,TGFβシグナル伝達の多様な細胞効果を媒介する重要な細胞内エフェクターである.
- SMAD2/3インタラクタを理解することは,細胞生物学と疾患メカニズムを理解するために不可欠です.
研究 の 目的:
- 人間の多能幹細胞におけるSMAD2/3の相互作用を解明する.
- 転写制御を超えたSMAD2/3を含む新しい分子プロセスを特定する.
- SMAD2/3とRNAメチル化との関わりを明らかにする.
主な方法:
- ヒトの多能幹細胞におけるSMAD2/3インタラクトームを決定するプロテオミック分析
- SMAD2/3とMETTL3-METTL14-WTAP m6Aメチルトランスフェラーゼ複合体の相互作用を調査する生化学的試験.
- 標的のトランスクリプトを特定するために,RNAの免疫降水と配列化 (RIP-Seq) が続く.
主要な成果:
- SMAD2/3はMETTL3- METTL14- WTAP複合体と相互作用し,N6- メチラデノシン (m6A) RNAの改変を触媒化する.
- SMAD2/3は,m6Aメチルトランスフェラーゼ複合体の特定のRNAトランスクリプトへの結合を促進する.
- この相互作用は,NANOGを含むSMAD2/3標的遺伝子を不安定化し,分化中に多能性からタイムリーに脱出することを促進します.
結論:
- SMAD2/3は,遺伝子発現をトランスクリプションのみならず,RNA表写体にも影響を及ぼします.
- 特定されたメカニズムは,細胞外TGFβシグナル伝達と,表表表体伝染学的調節による迅速な細胞応答を結び付けています.
- この経路は 細胞の運命を決定する過程や 幹細胞生物学や 癌のような病気を理解する上で 重要な意味を持ちます
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