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在Drosophila胚胎模式网络中,组织特异性RNA聚合酶II促进剂-近端暂停释放和爆发动力学
George Hunt1, Roshan Vaid1, Sergei Pirogov1
1Department Molecular Biosciences, The Wenner-Gren Institute, Stockholm University, Stockholm, Sweden.
Genome biology
|January 3, 2024
概括
果虫的发育依赖于特定组织的基因表达. 这项研究揭示了染色质状态如何调节RNA聚合酶II的暂停和爆发,从而在早期胚胎中获得精确的背中模式.
科学领域:
- 发展生物学 发展生物学
- 基因组学就是基因组学.
- 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:
- 多细胞发育依赖于特定于组织的转录程序.
- 德洛索菲拉胚胎的背中中心 (DV) 模式涉及染色体内的增强剂-促进剂相互作用.
- 染色体景观对转录的影响仍然不完全理解.
研究的目的:
- 为了全面地绘制Drosophila DV模式的不同转录和染色质状态.
- 阐明控制转录释放和破裂动态的调节机制.
- 了解染色体状态如何在发育过程中决定组织特异性基因表达.
主要方法:
- 对转录和染色质状态的全面分析.
- 评估RNA聚合酶II (Pol II) 的暂停和释放动态.
- 染色体免疫沉 (ChIP) 用于基因素乙化.
- 对转录突发动力学进行全转录组范围的推断.
主要成果:
- 聚二基因在促进体处暂停,先于胚胎基因组激活 (ZGA),并在细胞命运中持续存在.
- 生产延长通过组织特定的P-TEFb招募来调节.
- DV增强剂通过CBP介导的乙化获得独特的,组织特异的染色质状态,预测目标基因输出.
- 促进性染色体状态在很大程度上是组织不变的.
- 大发红血病基因表现出高爆发大小,在爆发大小或频率上有组织特异的变化.
结论:
- 开拓者转录因子确定了Pol II在ZGA之前暂停.
- 增强色素状态调节早期胚胎中暂停释放和组织特异性爆发.
- 发育模式是由来自原始化促进者的组织特异性转录爆发策划的,由增强器线索指导.
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