Polarized regulatory landscape and Wnt responsiveness underlie Hox activation in embryos.

Polarized regulatory landscape and Wnt responsiveness underlie Hox activation in embryos.
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DOI:
10.1101/gad.285767.116
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发表时间:
2016-09-01
影响因子:
10.5
通讯作者:
Deschamps J
Deschamps J
中科院分区:
生物学1区
文献类型:
--
作者:
Neijts R;Amin S;van Rooijen C;Tan S;Creyghton MP;de Laat W;Deschamps J

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内伊茨等人。表明一系列增强子(其中一些是 Wnt 依赖性的)位于 HoxA 3' subTAD 内。这种 subTAD 构成了多层 3' 极化特征的结构基础,包括 DNA 可及性和增强子激活。早期胚胎中 Hox 基因簇的 3' 至 5' 序列激活是发育生物学中最令人着迷的问题。在任何生物体中,Hox 基因 3'端转录起始所涉及的触发元件和调节元件都尚未解开。我们证明了一系列增强子(其中一些是 Wnt 依赖性的)位于 HoxA 3' 亚拓扑相关结构域 (subTAD) 内。这种 subTAD 构成了多层 3' 极化特征的结构基础,包括 DNA 可及性和增强子激活。 Wnt 依赖性增强子盒的删除证明了其在簇 3' 侧 HoxA 初始转录中的关键作用。
Neijts et al. show that a series of enhancers, some of which are Wnt-dependent, is located within a HoxA 3′ subTAD. This subTAD forms the structural basis for multiple layers of 3′-polarized features, including DNA accessibility and enhancer activation. Sequential 3′-to-5′ activation of the Hox gene clusters in early embryos is a most fascinating issue in developmental biology. Neither the trigger nor the regulatory elements involved in the transcriptional initiation of the 3′-most Hox genes have been unraveled in any organism. We demonstrate that a series of enhancers, some of which are Wnt-dependent, is located within a HoxA 3′ subtopologically associated domain (subTAD). This subTAD forms the structural basis for multiple layers of 3′-polarized features, including DNA accessibility and enhancer activation. Deletion of the cassette of Wnt-dependent enhancers proves its crucial role in initial transcription of HoxA at the 3′ side of the cluster.
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