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IRX5 promotes DNA damage repair and activation of hair follicle stem cells

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Mus musculus Homo sapiens

PROVIDER: GSE202076 | GEO | 2022/11/01

REPOSITORIES: GEO

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IRX5 promotes DNA damage repair and activation of hair follicle stem cells [nhek_d]

Project description:Here, we identify the transcription factor IRX5 as a promoter of HFSC activation. Irx5-/- mice display delayed onset of first postnatal anagen, with increased DNA damage and diminished HFSC proliferation. Through transcriptomic and epigenetic analysis, we discover the formation of open chromatin regions near key cell cycle progression- and DNA damage repair genes in Irx5-/- HFSC. We also identify DNA damage repair factors BRCA1 and BARD1 as IRX5 downstream targets. Inhibition of FGF18 kinase signaling partially rescues the anagen delay in Irx5-/- mice, indicating that the Irx5-/- HFSC quiescent phenotype is in part due to failure to suppress Fgf18 expression. Our findings identify IRX5 as a required promoter of DNA damage repair in HFSC activation and hair cycle initiation.

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IRX5 promotes DNA damage repair and activation of hair follicle stem cells (hfsc)

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