偽ウリジンのプロファイリングは,酵母とヒトの細胞における規制されたmRNA偽ウリジル化を明らかにする
Thomas M Carlile1, Maria F Rojas-Duran1, Boris Zinshteyn1
1Department of Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Nature
|September 6, 2014
まとめ
鍵となるRNAの改変である偽ウリジンは,酵母とヒトのメッセンジャーRNA (mRNA) で新たに発見されました. この発見は,細胞が環境変化に反応して,遺伝子発現を迅速に変化させる方法を示しています.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
- バイオケミストリー バイオケミストリー
背景:
- プセウドウリジンは,主にtRNAやrRNAのような非コーディングRNAで発見される,最も豊富なRNA改変です.
- それはRNAの構造を安定させ,RNAの機能を強化します.
- メッセンジャーRNA (mRNA) で自然に発生する偽ウリジンは,以前は特徴づけられていなかったため,その生理学的関連性は不明でした.
研究 の 目的:
- Saccharomyces cerevisiaeとヒトRNAの間の偽ウリジリレーションを包括的に分析する.
- 新しい偽ウリジリレーション部位,特にmRNAsを特定する.
- mRNAの偽ウリジル化およびその調節に責任を負う酵素を調査する.
主な方法:
- 偽ウリジン識別のための全ゲノム,単一核酸解像度法であるPseudo-seqの開発と応用.
- イーストとヒトRNAにおける偽ウリジリレーションの全ゲノム分析.
- 遺伝子解析により,特定の偽ウリジン合成酵素に改変部位を割り当てます.
主要な成果:
- Pseudo-seqは,非コーディングRNAの多くの既知のおよび新しいpseudouridineサイトを特定しました.
- 数百の偽ウリジル化部位がmRNAで発見されました.
- ほとんどの新しい偽ウリジンの部位は,7つの保存された偽ウリジンの合成酵素 (Pus1-4,6,7,9) に起因した.
- mRNAの偽ウリジリレーションは,環境信号 (例えば,栄養素/血清の飢餓) によって有意に調節されます.
結論:
- 偽ウリジレーションは,自然に存在するmRNAで発生し,以前の仮定に異議を唱えます.
- 誘導可能なmRNA偽ウリジリレーションは,遺伝コードの急速で制御された変化のためのメカニズムを提供します.
- この研究は,偽ウリジル化の新たな役割を明らかにし,ヒトの疾患に関連する偽ウリジルシンタゼの標的を特定しています.
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