A BNC1-IRF6-AP1 transcriptional network in keratinocytes and Squamous Cell Carcinoma
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA878091 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR20695592.fastq.gz | Fastqsanger.gz | |||
| SRR20695593.fastq.gz | Fastqsanger.gz | |||
| SRR20695594.fastq.gz | Fastqsanger.gz | |||
| SRR20695595.fastq.gz | Fastqsanger.gz | |||
| SRR20695596.fastq.gz | Fastqsanger.gz |
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Project description:The transcription factor Interferon Regulatory Factor 6 (IRF6) is crucially involved in craniofacial development and regulates the proliferation/differentiation balance in keratinocytes. Pathological IRF6 variants have been found in Van der Woude syndrome (VWS), the most common syndromic form of cleft lip / palate (CLP) as well as in non-syndromic CLP cases. Besides its prominent function in regulating keratinocyte differentiation, recent data revealed that IRF6 is also involved in wound healing and migration. Since a significant fraction of CLP patients undergoing corrective cleft surgery experience wound healing complications, IRF6 represents an interesting candidate gene linking the two processes. However, Irf6 function has been mainly studied in mice and knowledge on IRF6 in human cells remains sparse. Here, we aimed to elucidate the role of IRF6 in human postnatal skin- and oral mucosa-derived keratinocytes by its ablation using CRISPR/Cas9. We complement this approach by applying proteomics and identify that lack of IRF6 disrupts human epithelial homeostasis by altering cell colony morphology, migration pattern, and the differentiation potential of keratinocytes.
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Project description:The integrity of the mammalian epidermis is essential for organism survival, and it depends on a balance of proliferation and differentiation in the resident stem cell population. The kinase Ripk4 and the transcription factor Irf6 are mutated in severe developmental syndromes in humans, and mice lacking these genes display epidermal hyperproliferation and soft tissue fusions, resulting in neonatal lethality. However, the mechanism by which these genes control epidermal differentiation in vivo is unknown. By generating various mouse knock-out and knock-in strains we demonstrate that in vivo the role of Ripk4 in development is dependent on its kinase activity, Ripk4 and Irf6 function cell autonomously in the epidermis,Ripk4 and Irf6 lie on a linear pathway and phosphorylation of Irf6 on Serine413 and Serine424 is essential to prime it for activation. This priming then allows Ripk4 to phosphorylate Irf6 on Serine90, which ensures Irf6 activation. We then use RNA-seq, ChIP-seq and ATAC-seq analysis to define the global transcriptional targets of Irf6 in epidermal differentiation. Collectively, our results explain how Ripk4 activates Irf6, and how this pathway ensures epidermal differentiation and a functional barrier. This is crucial for understanding the etiology of developmental syndromes that are characterized by orofacial, skin and genital abnormalities.
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Project description:The integrity of the mammalian epidermis is essential for organism survival, and it depends on a balance of proliferation and differentiation in the resident stem cell population. The kinase Ripk4 and the transcription factor Irf6 are mutated in severe developmental syndromes in humans, and mice lacking these genes display epidermal hyperproliferation and soft tissue fusions, resulting in neonatal lethality. However, the mechanism by which these genes control epidermal differentiation in vivo is unknown. By generating various mouse knock-out and knock-in strains we demonstrate that in vivo the role of Ripk4 in development is dependent on its kinase activity, Ripk4 and Irf6 function cell autonomously in the epidermis,Ripk4 and Irf6 lie on a linear pathway and phosphorylation of Irf6 on Serine413 and Serine424 is essential to prime it for activation. This priming then allows Ripk4 to phosphorylate Irf6 on Serine90, which ensures Irf6 activation. We then use RNA-seq, ChIP-seq and ATAC-seq analysis to define the global transcriptional targets of Irf6 in epidermal differentiation. Collectively, our results explain how Ripk4 activates Irf6, and how this pathway ensures epidermal differentiation and a functional barrier. This is crucial for understanding the etiology of developmental syndromes that are characterized by orofacial, skin and genital abnormalities.
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