Interplay Between EDA-EDAR and WNT Signaling Pathways in the Development of Skin Appendages in Hypohidrotic Ectodermal Dysplasia

Hypohidrotic ectodermal dysplasia, the most common form of ectodermal dysplasia in children, is characterized by reduced sweating, sparse hair, and dental anomalies due to mutations in the EDA-EDAR-EDARADD-NF-κB signalling pathway. This study re-analyzed single-cell gene expression data from a mouse model, confirming the expression of Wnt10b, Dkk4, and Edar in epidermal keratinocytes and highlighting the correlated expression of Edaradd and NF-κB during early appendage formation. The findings suggest that EDA-A1 signalling enhances WNT pathway activity, and disruptions in this feedback loop contribute to the disorder's phenotypes. Restoring these pathways early may offer therapeutic potential for improving skin appendage development in affected individuals.