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HDACsは,DNA損傷反応,二重鎖断裂の処理,およびオートファギーをリンクしています
Thomas Robert1, Fabio Vanoli1, Irene Chiolo1,2
1Fondazione IFOM (Istituto FIRC di Oncologia Molecolare), IFOM-IEO Campus, via Adamello 16, Milan 20139, Italy.
Nature
|March 4, 2011
まとめ
ヒストン脱酸化酵素 (HDAC) 抑制は,酵母におけるDNA損傷反応経路を阻害し,Mec1 (ATR) の活性化とDNA修復に影響を与えます. このプロセスは,AutophagyによるSae2のアセチル化と分解を伴い,染色体の安定性に影響を及ぼします.
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:
- ヒストンアセチルトランスフェラーゼ (HAT) とデアセチラーゼ (HDAC) によって調節されるタンパク質アセチル化は,クロマチンのダイナミクスと細胞プロセスに影響を与えます.
- DNAダメージ反応は,ATMとATRキナーゼが媒介するチェックポイントに依存しています.
- DNA損傷反応を調節するアセチル化の正確な役割は,まだ完全に理解されていません.
研究 の 目的:
- タンパク質アセチル化がDNA損傷反応にどのように影響するかを調査する.
- DNA損傷処理とチェックポイントの活性化におけるHDACsとHATsの特定の役割を明らかにする.
主な方法:
- HDACの抑制と消去の効果を研究するために酵母モデルを使用しました.
- 評価されたMec1 (ATR) アクティベーション,DNA二重鎖断裂処理,および単一鎖DNA-RFA核繊維形成.
- リコンビネーションタンパク質Sae2 (CtIP) のアセチル化と分解,そしてそのオートファギーの関連性を研究した.
主要な成果:
- HDACの阻害またはアブレーションは,特に酵母Mec1 (ATR) の活性化,DNAの二重鎖の断裂処理,および単一鎖のDNA-RFA核繊維の形成を阻害します.
- リコンビネーションタンパク質 Sae2 がアセチル化され,その後 HDAC 阻害により分解することが判明しました.
- HDACの阻害は,オートファギーによるSae2の分解を促進し,特定のHDAC変異体 (hda1, rpd3) のDNA損傷感受性に影響を与えました.
結論:
- 特定のHDACs (Hda1,Rpd3) とHAT (Gcn5) は,ATRチェックポイントとDNA二重鎖断裂処理をオートファジーで調整する上で重要な役割を果たします.
- これらの発見は,HDACとHATの活動によるアセチル化が,DNA修復経路と自滅過程を統合することによって,染色体の安定性を調節するメカニズムを示唆しています.
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