BRCA1的招募限制了MYCN驱动的停滞RNA聚合酶的积累
Steffi Herold1, Jacqueline Kalb2, Gabriele Büchel2
1Theodor Boveri Institute, Department of Biochemistry and Molecular Biology, Biocenter, University of Würzburg, Würzburg, Germany. s.herold@uni-wuerzburg.de.
Nature
|March 22, 2019
概括
在神经母细胞瘤中MYCN激活导致RNA聚合酶II (RNAPII) 脱离促进体. 通过MYCN招募BRCA1可以防止RNAPII停滞,并增强转录,帮助瘤存活.
科学领域:
- 癌症学
- 分子生物学
- 基因调控
背景情况:
- MYC和MYCN是调节基因表达的瘤转录因子.
- 失调的MYCN驱动神经内分泌瘤,与预后不佳有关.
- 在转录调节和瘤发育中MYCN的作用需要进一步阐明.
研究的目的:
- 研究MYCN影响RNA聚合酶II (RNAPII) 活动的机制.
- 确定MYCN调节神经母细胞瘤转录的因素.
- 了解MYCN驱动的瘤如何应对改变的RNAPII动态.
主要方法:
- 在人类神经母细胞中MYCN激活的分析.
- 染色体免疫沉以评估蛋白质对促进体的吸引力.
- 用于研究蛋白相互作用和稳定性的生物化学测试.
- 对mRNA分离和R循环形成的研究.
主要成果:
- 激活MYCN会诱导RNAPII从促进体中脱离.
- 当RNAPII释放失败时,MYCN将BRCA1招募到促销器附近的区域.
- BRCA1稳定了停滞的RNAPII,抑制了R循环的形成,并增强了MYCN的转录活性.
- USP11通过脱化MYCN调解BRCA1的招募,稳定MYCN-BRCA1-USP11复合体.
结论:
- MYCN利用涉及BRCA1的细胞系特异性应激反应来管理放松的RNAPII功能.
- 通过MYCN招募BRCA1对于增强神经母细胞瘤的转录和瘤生存至关重要.
- 在稳定MYCN和促进瘤发生方面,USP11-BRCA1-MYCN轴起着关键作用.
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