Sox2 levels regulate the chromatin occupancy of WNT mediators in epiblast progenitors responsible for vertebrate body formation.

Sox2 levels regulate the chromatin occupancy of WNT mediators in epiblast progenitors responsible for vertebrate body formation.
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Sox2水平调节WNT介质在脊椎动物体形成的外胚层祖细胞中的染色质占用。

DOI:
10.1038/s41556-022-00910-2
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发表时间:
2022-05
影响因子:
21.3
通讯作者:
--
中科院分区:
生物学1区
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WNT信号具有多种作用。它维持胚胎干细胞的多能性,在上胚层中分配后部身份并诱导中胚层组织。在这里,我们提供的证据表明,这些不同的功能进行的转录因子SOX 2,它采用不同的模式的染色质相互作用和调控元件的选择,这取决于其表达水平。在高水平下,SOX 2从具有高亲和力SOX 2结合位点的调节元件置换核小体,募集WNT效应子TCF/β-连环蛋白并维持多能基因表达。降低S 0X 2水平使多能性不稳定,并将S 0X 2/TCF/β-连环蛋白占据重新配置为尾部上胚层表达的基因。这些含有低亲和力的SOX 2位点,并被T/Bra和CDX共同占据。S 0X 2的缺失允许WNT诱导的中胚层分化。这些发现定义了Sox 2水平在决定TCF/β-catenin的染色质占据中的作用,并揭示了转录因子水平如何配置对信号的上下文特异性反应。Blassberg等人报道,SOX 2水平决定TCF/β-连环蛋白的染色质占有率,从而协调WNT反应和上胚层祖细胞命运。
WNT signalling has multiple roles. It maintains pluripotency of embryonic stem cells, assigns posterior identity in the epiblast and induces mesodermal tissue. Here we provide evidence that these distinct functions are conducted by the transcription factor SOX2, which adopts different modes of chromatin interaction and regulatory element selection depending on its level of expression. At high levels, SOX2 displaces nucleosomes from regulatory elements with high-affinity SOX2 binding sites, recruiting the WNT effector TCF/β-catenin and maintaining pluripotent gene expression. Reducing SOX2 levels destabilizes pluripotency and reconfigures SOX2/TCF/β-catenin occupancy to caudal epiblast expressed genes. These contain low-affinity SOX2 sites and are co-occupied by T/Bra and CDX. The loss of SOX2 allows WNT-induced mesodermal differentiation. These findings define a role for Sox2 levels in dictating the chromatin occupancy of TCF/β-catenin and reveal how context-specific responses to a signal are configured by the level of a transcription factor. Blassberg et al. report that SOX2 levels determine the chromatin occupancy of TCF/β-catenin, thus orchestrating the WNT response and epiblast progenitor fate.
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