Overactive Wnt5a Signaling Disrupts Hair Follicle Polarity During Mouse Skin Development

The study investigated the effects of overactive Wnt5a signaling on hair follicle development in mice, revealing that excessive Wnt5a disrupted hair follicle polarity during skin development. This misorientation was linked to Wnt5a signaling through the Frizzled 6 (Fzd6) receptor, as a heterozygous loss of Fzd6 could rescue the phenotype. Despite the disruption, the distribution of planar cell polarity (PCP) proteins remained unchanged, and transcriptional profiling identified potential target genes of the Wnt5a/Fzd6 pathway. The research suggested that Wnt5a acted as a PCP ligand, with other Wnts potentially compensating for its absence, indicating redundancy in regulating hair follicle polarity. The study highlighted the importance of balanced Wnt5a signaling for proper hair follicle orientation and function.