原蛋白蛋白Brd4隔离了染色质的DNA损伤信号
Scott R Floyd1, Michael E Pacold, Qiuying Huang
1Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Nature
|June 4, 2013
概括
一种特定形式的Brd4蛋白对DNA损伤反应信号起到制动作用. 这一发现揭示了Brd4的存在.
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:
- DNA 损伤会触发复杂的信号网络,以停止细胞循环,修复DNA或诱导细胞死亡.
- 染色体结构在启动和传播DNA损伤反应方面发挥着至关重要的作用.
- BET (原蛋白和外终端) 家族成员Brd4因其在转录控制中的作用而闻名.
研究的目的:
- 为了研究染色质结构在DNA损伤反应中的作用.
- 为了确定染色体修饰和相互作用的基因,参与电离辐射诱导的信号传递.
- 阐明Brd4异型在DNA损伤反应途径中的功能.
主要方法:
- 染色体修饰和相互作用基因的高含量多重RNA介导干扰 (RNAi) 屏幕.
- 监测电离辐射诱导的信号和响应事件.
- 研究Brd4与染色质和凝二复合物的相互作用.
主要成果:
- 一种Brd4的异型作为DNA损伤反应信号的内源性抑制剂.
- Brd4通过基基因相互作用将凝聚素II复合物招募到乙化组织蛋白中.
- 这种Brd4异型体的丧失导致染色质放松,细胞周期恢复更快,辐射后生存率增加.
- 这种 Brd4 异型的功能增强使染色质紧,减弱了 DNA 损伤反应信号,并增强了辐射诱导的致命性.
结论:
- Brd4作为一种染色质绝缘体,可以调节对DNA损伤的信号响应.
- 特定的Brd4异型可以微调细胞对DNA损伤的反应,影响细胞命运.
- 向Brd4可能提供治疗策略,用于在各种情况下管理DNA损伤反应.
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