ArticlebioRxiv : the preprint server for biology2025
Keratin 15 promotes a progenitor cell state in basal keratinocytes of skin epidermis.
Article in bioRxiv : the preprint server for biology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The type I intermediate filament proteins keratin 14 (K14) and keratin 15 (K15) are common to all complex epithelia. K14 is highly expressed by progenitor keratinocytes, in which it provides essential mechanical integrity and gates keratinocyte entry into differentiation by sequestering YAP1, a transcriptional effector of Hippo signaling, to the cytoplasm. K15 has long been used as a marker of hair bulge stem cells though its specific role in skin epithelia is unknown. Here we show that the lack of two biochemical determinants, a cysteine residue within the stutter motif of the central rod domain and a 14-3-3 binding site in the N-terminal head domain, renders K15 unable to effectively sequester YAP1 in the cytoplasm. We combine insight obtained from cell culture and transgenic mouse models with computational analyses of transcriptomics data and propose a model in which the K15:K14 ratio promotes a progenitor state and antagonizes differentiation in keratinocytes of the epidermis.
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