VDR and leprosy: Susceptibility to leprosy depends on various mutations within several genes, for example, the major histocompatibility complex (HLA-DR, HLA-DQ), tumour necrosis factor α (TNFA), Toll-like receptors (TLR1, TLR2, TLR4, TLR9), vitamin D receptor (VDR) or cytotoxic T cell antigen 4 (CTLA4), among others [89, 99, 100].