CYP17A1 and disorder of sexual differentiation: Gene defects of steroidogenesis causing DSD include AKR1C2, AKR1C4, CYB5A, CYP11A1, CYP11B1, CYP17A1, CYP19A1, CYP21A2, DHCR7, HSD3B2, HSD17B3, POR, SRD5A2, and STAR [3,28].