Plays a role in hair follicle differentiation. Expressed in kidney and stomach. Expression in the outer medulla of the kidney and the transitional epithelium. Expressed in the hair follicle medulla. Defects in Foxq1 are the cause of the satin (sa) phenotype and results in a silky coat with high sheen arising from structurally abnormal medulla cells and defects in differentiation of the hair shaft.