染色体状態とATMシグナル伝達によるDNA損傷による転写ストレスの交差
Irene Salas-Armenteros1, Maarten Klunder1, Wim Vermeulen2
1Department of Molecular Genetics, Erasmus MC Cancer Institute, Erasmus University Medical Centre, Rotterdam, 3015 GD, The Netherlands.
The EMBO journal
|August 26, 2025
まとめ
DNAダメージ応答 (DDR) はクロマチンの変化を伴う. 停滞したRNAポリメラーゼIIはアセチル化,Rループ形成,ATMシグナリングを誘発し,クロマチンとDDR経路のクロス調節を明らかにする.
科学分野:
- 分子生物学
- 細胞生物学
- ゲノミクス
背景:
- DNAダメージレスポンス (DDR) は,ゲノムの安定性を維持するために不可欠です.
- 染色体構造とDDR信号伝達経路の間にリンクが存在する.
- 転写阻害性DNA損傷中のこの相互作用のメカニズムは完全に理解されていません.
研究 の 目的:
- 転写阻害DNA病変に対する反応としてクロマチンの改変とDDR信号の相互作用を調査する.
- RNAポリメラーゼIIの停滞とDDRの活性化をつなぐ分子メカニズムを解明する.
主な方法:
- クロマチンのアセチル化とヒストンの変化の分析
- RNA:DNAハイブリッド (Rループ) の形成を調査する.
- ATM信号経路の活性化と下流キナーゼ活性 (p38MAPK/MSK1) の評価
主要な成果:
- DNAの損傷でRNAポリメラーゼIIが停止すると,p300経由で局所クロマチンのアセチル化が誘発される.
- クロマチンのリラクゼーションは,スプライソーム解離とRループ形成を促進し,ATMを活性化します.
- ATMの活性化により,H2A.Xのリン酸化とp38MAPK/MSK1依存のH3S10のリン酸化が起こり,染色体の形状が変化する.
結論:
- 転写阻害DNA病変は,クロマチンのアセチル化とRループ形成を含むDDR経路を誘発する.
- ATMシグナリングはクロマチンの状態によって調節され,それもクロマチンの形状に影響します.
- このクロマチンとATMの信号の交互調節は,転写ストレスに対する細胞反応の重要なメカニズムである.
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