两种独立的转录启动代码在脊椎动物核心促进器上重叠
Vanja Haberle1,2, Nan Li3, Yavor Hadzhiev3
1Department of Biology, University of Bergen, Thormøhlensgate 53A, N-5008 Bergen, Norway.
Nature
|February 18, 2014
概括
斑马鱼的发育揭示了两种不同的转录开始部位 (TSS) 选择机制:一种使用A/T丰富基因的母体模式和一种使用二核酸模式的胚胎模式. 这些模式在促进体中共存,使得在发育过渡期间的基因表达成为可能.
科学领域:
- 分子生物学分子生物学
- 发育生物学 发展生物学
- 基因组学就是基因组学.
背景情况:
- 通过RNA聚合酶II选择转录起点 (TSS) 对于基因表达至关重要,但人们对其了解甚少.
- 斑马鱼的母性转化为胚胎的转化提供了一个模型来研究TSS选择和染色质动态.
- 了解TSS语法是解读早期发育期间基因调节的关键.
研究的目的:
- 为了研究在斑马鱼胚胎基因组激活过程中管理TSS选择的规则.
- 分析DNA序列动图,核细胞定位和TSS使用之间的相互作用.
- 描述在母体和胚胎转录过程中活跃的独特TSS选择语法.
主要方法:
- 使用基因表达的上限分析 (CAGE) 对TSS使用的高分辨率分析.
- 确定H3K4me3标记的核酶体位置在促进体.
- 在不同发育阶段对DNA序列特征和染色质标记进行比较分析.
主要成果:
- 确定了两种不同的TSS选择语法:母性 (A / T丰富的W-box) 和细胞性 (二核酸丰富物).
- 齐哥特的TSS选择与第一个下游 (+1) 核酶精确地对齐.
- H3K4me3核细胞在胚胎转录之前对DNA序列进行定位,并在启动后进行调整.
结论:
- 孕产妇到胚胎的过渡涉及TSS选择语法中的切换,影响促进体形状和TSS使用.
- 核心促进体中重叠的TSS语法允许在不同的监管环境中表达.
- 这项研究为了解促进者结构和功能在不同的监管环境中提供了一个框架.
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