コア・スプライソームは,非正規のATM信号のターゲットとエフェクタとして機能する
Maria Tresini1, Daniël O Warmerdam2, Petros Kolovos3
1Department of Genetics, Cancer Genomics Netherlands, Erasmus University Medical Center, Rotterdam, 3015 CN, The Netherlands.
Nature
|June 25, 2015
まとめ
DNAダメージ反応には,スプライソームの異位とRループの形成があり,ATMキナーゼを活性化します. このフィードバックループは,DNA損傷後の組織ホメオスタシスの維持に不可欠な代替スプライシングを強化します.
科学分野:
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
- 遺伝学 遺伝学とは
背景:
- 組織ホメオスタシスは,DNA損傷反応経路に依存しています.
- DNA損傷は,mRNAレベルと代替スプライシングを通じて遺伝子発現に影響します.
- 代替スプライシングは,DNA損傷に対する細胞の反応において重要な役割を果たします.
研究 の 目的:
- DNAダメージに対する反応としてスプライソームの役割を調査する.
- DNAの病変,スプライソームの異位,そしてシグナル伝達経路を結びつけるメカニズムを解明する.
- DNA損傷反応におけるRループ形成の機能を定義する.
主な方法:
- DNAの損傷におけるスプライソーム動力の分析.
- RNAポリメラーゼの停止とRループ形成の調査.
- ATMキナーゼ活性化とその下流効果の評価.
- 代替スプライシングの変化の全ゲノム分析.
主要な成果:
- 転写を阻害するDNA病変は,後期期のスプライソソームのクロマチンの異位を引き起こします.
- ATMキナーゼとスピライソソームの組織を伴うポジティブなフィードバックループが特定されました.
- 停止したRNAポリメラーゼによって引き起こされるRループ形成は,ATMを活性化します.
- ATMシグナリングはさらにスプライソームの組織を阻害し,UV誘発の代替スプライシングを強化します.
結論:
- DNAの損傷によるR-ループ依存のATM活性化は,複製しない細胞のDNA損傷反応に不可欠である.
- スプライソームの異位は,この過程の重要な出来事です.
- このメカニズムは,DNA修復,スプライシング,シグナリングの間の新しい相互作用を強調しています.
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