PAX3-FOXO1使用其激活域来招募CBP/P300并塑造RNA Pol2集群分布
Yaw Asante1, Katharina Benischke2, Issra Osman3
1Department of Nutrition, Case Western Reserve University, Cleveland, OH, USA.
Nature communications
|December 15, 2023
概括
在PAX3-FOXO1 (P3F) 中的一个关键的氨酸招募CBP/p300,这对于膜性狂宫肌肉瘤 (aRMS) 中的瘤基因转录至关重要. 破坏这种相互作用会阻止癌细胞的生长,并揭示出新的治疗点.
科学领域:
- 在瘤学瘤学.
- 分子生物学分子生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 长程增强剂通过转录因子 (TF) 和协同激活剂控制致癌基因表达.
- 在许多癌症中,包括膜性狂宫肌肉瘤 (aRMS) 中,精确的TF-to-coactivator相互作用尚未完全理解.
研究的目的:
- 阐明PAX3-FOXO1 (P3F) 融合TF中的特定氨酸在招募联合激活剂中的作用.
- 为了研究P3F-CBP/p300相互作用在aRMS瘤发生中的功能意义.
- 了解CBP/p300如何影响基因中的RNA-聚合酶2 (Pol2) 活性.
主要方法:
- 位点导向的突变发生改变P3F激活域 (AD) 中一个关键的氨酸.
- 在aRMS细胞系中进行细胞增殖和分化试验.
- 染色体免疫沉 (ChIP) 和显微镜评估Pol2聚类和定位.
主要成果:
- 在P3FAD中的单个囊蛋白对于招募CBP/p300到染色素至关重要.
- 突变这种囊蛋白抑制了aRMS细胞的增殖,并促进了分化.
- CBP/p300对于维持 Pol2 在增强基因循环中的聚合至关重要;它缺失导致了 Pol2 错位化和转录性崩.
结论:
- 由特定的氨酸介导的P3F-CBP/p300相互作用对于维持aRMS中的瘤转录至关重要.
- 针对P3F-CBP/p300轴为RMS提供了一个潜在的治疗策略.
- CBP/p300在组织癌基因激活所必需的远程Pol2循环中发挥着关键作用.
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