Autosomal Ichthyosis With Hypotrichosis Syndrome Displays Low Matriptase Proteolytic Activity and Is Phenocopied in ST14 Hypomorphic Mice

The study explored the impact of the G827R mutation in the ST14 gene, which significantly reduced matriptase proteolytic activity, leading to Autosomal Recessive Ichthyosis with Hypotrichosis (ARIH). Researchers created ST14 hypomorphic mice with a 100-fold reduction in matriptase mRNA, which exhibited symptoms similar to ARIH, such as ichthyosis, hypotrichosis, and tooth defects. These mice demonstrated that reduced matriptase activity impaired epidermal processes, including desquamation and proteolytic processing of proteins like prostasin and profilaggrin, but allowed survival with moderate impairment. The study provided a valuable model for understanding matriptase's role in skin and hair conditions and suggested potential therapeutic targets.