DBP and infectious disease: Several single nucleotide polymorphisms (SNPs) in genes related to VitD metabolism (DHCR7, CYP2R1, CYP27A1, CYP27B1, CYP3A4, CYP24A1, DBP, VDR, and RXRA, among others) have been associated with plasma levels of 25(OH)D and infectious diseases (Jolliffe et al., 2016).