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Transcriptomic landscape of early hair follicle and epidermal development [RNA-seq]

ABSTRACT: In-depth transcriptional analysis of mature hair placode and interfollicular epithelium using bulk RNA-seq method.

ORGANISM(S): Mus musculus

PROVIDER: GSE212652 | GEO | 2023/06/14

REPOSITORIES: GEO

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Transcriptomic landscape of early hair follicle and epidermal development [scRNA-seq]

Project description:In-depth transcriptional analysis of mature hair placode and interfollicular epithelium using scRNA-seq method.

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Lgr6 Marks Stem Cells in the Hair Follicle that Generate all Cell Lineages of the Skin

Project description:Mammalian epidermis consists of three self-renewing compartments: the hair follicle, sebaceous gland and interfollicular epidermis. We generated knock-in alleles of murine Lgr6, a close relative to the Lgr5 stem cell gene. Lgr6 was expressed in the earliest embryonic hair placodes. In adult hair follicles, Lgr6+ cells resided in a previously uncharacterized region directly above the follicle bulge. They expressed none of the known bulge stem cell markers. Prenatal Lgr6+ cells established the hair follicle, sebaceous gland and interfollicular epidermis. Postnatally, Lgr6+ cells generated sebaceous gland and interfollicular epidermis, while contribution to hair lineages gradually diminished with age. Adult Lgr6+ cells executed long-term wound repair, including the formation of new hair follicles. We conclude that Lgr6 marks the most primitive epidermal stem cell. For the Lgr5 and Lgr6 stem cell comparison RNA was isolated from sorted GFPhi cell fractions of dorsal skin from Lgr5-EGFP-ires-CreERT2 mice and Lgr6-EGFP-ires-CreERT2, respectively (3 mice per group per sort).

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Lgr6 Marks Stem Cells in the Hair Follicle that Generate all Cell Lineages of the Skin

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Gene expression signature of the three major epidermal differentiation compartments: interfollicular epidermis (IFE), hair follicle (HF) and sebaceous gland (SG).

Project description:There are multiple stem cells in adult mammalian epidermis, but the mechanisms controlling lineage specification are poorly understood. To identify gene expression signatures of the three major epidermal differentiation compartments we micro-dissected individual SG, IFE and HF from adult epidermis. The RNA was isolated from age and sex matched wild-type mice and performed transcriptome analysis with Affymetrix Exon microarrays We micro-dissected individual interfollicular epidermis (IFE), hair follicle (HF) and sebaceous gland (SG) from adult tail epidermis. The RNA was isolated from age and sex matched wild-type mice. Three biological replicates for each epidermal differentiation compartment were analyzed.

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Transcriptomic landscape of early hair follicle and epidermal development

Project description:Transcriptomic landscape of early hair follicle and epidermal development

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Troy/Tnfrsf19 marks epidermal cells that govern interfollicular epidermal renewal and cornification

Project description:The skin epidermis is a highly compartmentalised tissue consisting of a cornifying epithelium called the interfollicular epidermis (IFE) and associated hair follicles (HFs). Several stem cell populations have been described that mark specific sub compartments in the skin but none of them is IFE-specific. Here we identify Troy as a marker of IFE and HF infundibulum basal layer cells in embryonic and adult human and mouse epidermis. Genetic lineage-tracing experiments demonstrate that Troy-expressing basal cells contribute to long-term renewal of all layers of the cornifying epithelium. Single-cell transcriptomics and organoid assays of Troy-expressing cells as well as their progeny confirmed stem cell identity as well as the ability to generate differentiating daughter cells. In conclusion, we define Troy as a marker of epidermal basal cells that govern interfollicular epidermal renewal and cornification.

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