In the VDR gene, a number of allelic variations have been described, including restriction fragment length polymorphisms -which have an association with some of the patterns presented by PCOS- such as FokI (C/T) (rs10735810/rs2228570), BsmI (A/G) (rs1544410), ApaI (A/C) (rs7975232), Tru9I (G/A) (rs757343), and TaqI (T/C) (rs731236). Here, VDR is linked to polycystic ovary syndrome.