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HDACs与DNA损伤反应,双链断裂的处理和自有关
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
概括
激素脱乙酶 (HDAC) 抑制会破坏酵母中的DNA损伤反应途径,影响Mec1 (ATR) 激活和DNA修复. 这一过程涉及Sae2通过自的乙化和降解,影响染色体的稳定性.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 遗传学 是一个遗传学.
背景情况:
- 蛋白质乙化受组织素乙转移酶 (HATs) 和脱乙酶 (HDACs) 的调节,影响色素动态和细胞过程.
- DNA损伤反应依赖于ATM和ATR激酶介导的检查点.
- 乙化在调节DNA损伤反应中的确切作用仍然不完全理解.
研究的目的:
- 研究蛋白质乙化如何影响DNA损伤反应.
- 阐明HDACs和HATs在DNA损伤处理和检查点激活中的特定作用.
主要方法:
- 利用酵母模型研究HDAC抑制和消去的影响.
- 评估了Mec1 (ATR) 激活,DNA双链断裂处理和单链DNA-RFA核纤维形成.
- 研究了重组蛋白Sae2 (CtIP) 的乙化和降解及其与自的联系.
主要成果:
- 抑制或消去HDAC特别损害了酵母Mec1 (ATR) 激活,DNA双链断裂处理和单链DNA-RFA核纤维形成.
- 发现重组蛋白Sae2被乙化,随后在抑制HDAC后降解.
- 抑制HDAC通过自促进了Sae2降解,影响了特定HDAC突变 (hda1,rpd3) 的DNA损伤敏感性.
结论:
- 特定的HDACs (Hda1,Rpd3) 和HAT (Gcn5) 在协调ATR检查点和DNA双链断裂处理与自中发挥关键作用.
- 这些发现表明,通过HDAC和HAT活性,乙化通过将DNA修复途径与自过程集成来调节染色体稳定性的机制.
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