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Dev Cell. 2018 Oct 8;47(1):21-37.e5. doi: 10.1016/j.devcel.2018.08.010. Epub 2018 Sep 13.

Single Cell and Open Chromatin Analysis Reveals Molecular Origin of Epidermal Cells of the Skin.

Author information

1
Department of Molecular, Cellular and Developmental Biology, University of Colorado Boulder, Boulder, CO, USA.
2
Department of Oral Biology, School of Dental Medicine, SUNY at Buffalo, Buffalo, NY, USA.
3
Department of Biochemistry, Jacob School of Medicine and Biomedical Sciences, SUNY at Buffalo, Buffalo, NY, USA.
4
Department of Molecular, Cellular and Developmental Biology, University of Colorado Boulder, Boulder, CO, USA. Electronic address: yir@colorado.edu.

Abstract

How embryonic progenitors coordinate cell fate specification and establish transcriptional and signaling competence is a fundamental question in developmental biology. Here, we show that transcription factor ΔNp63 profoundly changes the transcriptome and remodels thousands of open chromatin regions of Krt8+ progenitors during epidermal fate specification. ATAC-seq and single-cell RNA-seq reveal that ΔNp63-dependent programs govern epidermal lineage formation, and ΔNp63-independent programs, mediated by AP2 and AP1 transcription factors, promote epidermal differentiation and epithelial-to-mesenchymal transition. ΔNp63 promotes Wnt signaling by directly upregulating Wnt ligands, Frizzled receptors, and transcription factors. Deletion of β-catenin in Krt8+ progenitors delays their maturation into Krt5+ progenitors. The lack of epidermal Wnt production in the absence of ΔNp63 also incapacitates Wnt activation in the underlying dermal cells. These findings reveal the remarkable changes of the transcriptome, open chromatin, and signaling pathways at the onset of skin development and uncover the molecular cascade for epidermal lineage formation.

KEYWORDS:

ATAC-seq; Wnt signaling; epidermal fate; single cell analysis; transcriptional network

PMID:
30220568
PMCID:
PMC6177292
[Available on 2019-10-08]
DOI:
10.1016/j.devcel.2018.08.010
[Indexed for MEDLINE]

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