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
中科院分区:
文献类型:
--
作者:
Neijts R;Amin S;van Rooijen C;Tan S;Creyghton MP;de Laat W;Deschamps J
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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