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Hoxc-Dependent Mesenchymal Niche Heterogeneity Drives Regional Hair Follicle Regeneration.
Cell Stem Cell 2018 October 5
Mesenchymal niche cells instruct activity of tissue-resident stem and progenitor cell populations. Epithelial stem cells in hair follicles (HFs) have region-specific activity, which may arise from intrinsic cellular heterogeneity within mesenchymal dermal papilla (DP) cells. Here we show that expression of Hoxc genes is sufficient to reprogram mesenchymal DP cells and alter the regenerative potential of epithelial stem cells. Hoxc gene expression in adult skin dermis closely correlates with regional HF regeneration patterns. Disrupting the region-specific expression patterns of Hoxc genes, by either decreasing their epigenetic repression via Bmi1 loss or inducing ectopic interactions of the Hoxc locus with an active epigenetic region, leads to precocious HF regeneration. We further show that a single Hoxc gene is sufficient to activate dormant DP niches and promote regional HF regeneration through canonical Wnt signaling. Altogether, these results reveal that Hoxc genes bestow mesenchymal niches with tissue-level heterogeneity and plasticity.
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