Generation of a Novel Inducible and Dermal Papilla-Specific Wif1-CreER Knock-In Mouse Line for Hair Follicle Research

Researchers have developed a novel genetic tool, the Wif1-CreER knock-in mouse line, to improve the precision of labeling and manipulating dermal papilla (DP) cells, which are crucial for hair follicle development and regeneration. This was achieved by inserting CreERT2 sequences into the Wif1 gene using CRISPR/Cas9, allowing for specific Cre recombinase activity in DP cells across different hair cycle stages upon tamoxifen treatment. The model was validated through PCR, sequencing, and immunofluorescence, showing minimal expression in non-target tissues. This tool addresses the limitations of previous models and enhances the study of hair biology and the development of therapies for hair disorders.