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

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Item Type:Article
Title:Sox2 levels regulate the chromatin occupancy of WNT mediators in epiblast progenitors responsible for vertebrate body formation
Creators Name:Blassberg, R. and Patel, H. and Watson, T. and Gouti, M. and Metzis, V. and Delás, M.J. and Briscoe, J.
Abstract: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.
Keywords:beta Catenin, Chromatin, Mesoderm, Transcription Factors, Vertebrates, Animals
Source:Nature Cell Biology
ISSN:1465-7392
Publisher:Nature Publishing Group
Volume:24
Number:5
Page Range:633-644
Date:May 2022
Official Publication:https://doi.org/10.1038/s41556-022-00910-2
PubMed:View item in PubMed

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