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Single-cell analysis RNA sequencing of whole mouse skin at embryonic day 13.5 and 14.5

ABSTRACT: A major challenge in delineating molecular and cellular events that precede appendage morphogenesis stems from the inability to distinguish quantitative molecular differences between cells that lack histological distinction. The hair follicle (HF) dermal condensate (DC) is a cluster of cells critical for HF development and regeneration. Events that presage emergence of this distinctive population are poorly understood. Using unbiased single-cell RNA sequencing and in vivo methods, we infer a sequence of transcriptional states through which DC cells pass that begins prior to HF morphogenesis. Our data indicate that Wnt/b-catenin signaling is required to progress into an intermediate stage that precedes quiescence and differentiation. Further, we provide evidence that quiescent DC cells are recent selective progeny of proliferating cells present prior to morphogenesis and that are identified in the peri-DC zone during DC expansion. Together, these findings provide an inferred path of molecular states that lead to DC cell differentiation.

ORGANISM(S): Mus musculus

PROVIDER: GSE122043 | GEO | 2018/12/27

REPOSITORIES: GEO

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Microarray analysis of microRNA expression in mouse fetus at 13.5 and 14.5 days post-coitum in ear and back skin tissues.

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Î²-cateinin activation in hair follicle dermal sheath induces ectopic hair outgrowth and skin fibrosis

Project description:Dermal sheath (DS) shows potent hair inducing capability and high plasticity without leading to immuno rejection. A recent study showed a subset of DS cells, identified as hair follicle (HF) dermal stem cells, can be mobilized to regenerate DS, maintain/supply the cell number of dermal papilla (DP) and modulate hair type. However, it is unclear how Wnt/Î²-catenin signaling regulates DS cells behaviors. Here we report that activation of Î²-catenin in DS, to some extent, endows it with hair inducing ability, reprogramming HF epidermal cells to generate new outgrowth. The new formed dermal condensates (DC)/DP lying adjacent the outgrowth derives from DS and/or its progeny, and homeostasis of pre-existing HFs is disturbed. Additionally, progressive skin fibrosis is prominent in hypodermis, where the excessive activated fibroblasts at least partially originate from DS and/or its progeny. Gene expression analysis of purified DS cells revealed that 44% DC signature genes are regulated, most of which are up-regulated. We found elevated expression of several growth factors, including Noggin, Fgf7 and Fgf10, which were previously implicated in HF induction. In summary, we confirm the high plasticity of DS cells by in vivo assays and report a mechanism by which Wnt/Î²-catenin signaling controls DS cells behaviors. We prospectively isolated control and cÎex3 DS cells (YFP+ve CD34-ve ALP-ve ITGÎ±8-ve cells) from P15 dorsal skins by FACS.

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2011-03-11 | GSE20278 | GEO

β-cateinin activation in hair follicle dermal sheath induces ectopic hair outgrowth and skin fibrosis

Project description:Dermal sheath (DS) shows potent hair inducing capability and high plasticity without leading to immuno rejection. A recent study showed a subset of DS cells, identified as hair follicle (HF) dermal stem cells, can be mobilized to regenerate DS, maintain/supply the cell number of dermal papilla (DP) and modulate hair type. However, it is unclear how Wnt/β-catenin signaling regulates DS cells behaviors. Here we report that activation of β-catenin in DS, to some extent, endows it with hair inducing ability, reprogramming HF epidermal cells to generate new outgrowth. The new formed dermal condensates (DC)/DP lying adjacent the outgrowth derives from DS and/or its progeny, and homeostasis of pre-existing HFs is disturbed. Additionally, progressive skin fibrosis is prominent in hypodermis, where the excessive activated fibroblasts at least partially originate from DS and/or its progeny. Gene expression analysis of purified DS cells revealed that 44% DC signature genes are regulated, most of which are up-regulated. We found elevated expression of several growth factors, including Noggin, Fgf7 and Fgf10, which were previously implicated in HF induction. In summary, we confirm the high plasticity of DS cells by in vivo assays and report a mechanism by which Wnt/β-catenin signaling controls DS cells behaviors.

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