多个表现出不同分子和功能特征的Fra-1-结合增强剂可以合作抑制基因转录
Fabienne Bejjani1,2, Emilie Evanno1, Samantha Mahfoud1,2
1IGMM, Univ Montpellier, CNRS, Montpellier, France.
Cell & bioscience
|July 18, 2023
概括
像Fra-1这样的转录因子 (TF) 可以通过涉及多种增强剂的复杂机制抑制基因表达. 这项研究揭示了 Fra-1 的存在.
科学领域:
- 分子生物学分子生物学
- 基因规则 基因规则
- 癌症生物学 癌症生物学
背景情况:
- 转录因子 (TF) 中介基因抑制的机制尚未完全理解,特别是当TF结合多个调节同一基因的增强剂时.
- 目前尚不清楚TFs与同一基因的不同增强剂结合时是否会产生类似或不同的分子效应.
研究的目的:
- 研究转录因子Fra-1如何降低TGFB2基因表达的调节.
- 为了阐明分子机制和染色质相互作用涉及到Fra-1-介导的抑制.
主要方法:
- 利用了Fra-1-介导的TGFB2基因下调在癌细胞中的研究模型.
- 分析了RNA Pol II招募,转录启动复合体形成和长距离染色体相互作用.
- 评估了p300/CBP氨酸乙转移酶活性的作用.
主要成果:
- Fra-1抑制TGFB2转录,不是通过减少RNA Pol II招募,而是通过减少转录启动形式的形成.
- 观察到复杂的,涉及异质Fra-1-结合增强剂的长距离染色体相互作用.
- 证明了这些增强剂对p300/CBP活性的差异性要求,这表明了效应平衡.
结论:
- 揭示了Fra-1对TGFB2基因表达的抑制作用的复杂分子机制.
- 提供了AP-1复合体的功能,其中Fra-1作为关键的亲瘤成分.
- 提出了关于TFs与同一基因的不同增强剂结合的分子功能的异质性的问题.
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