CYP2R1 and type 1 diabetes mellitus: Previous research has shown the gene CYP2R1 to be associated with several vitamin D related diseases such as type 1 diabetes [21], and in this study we found that rs10741657 SNP, which is a coding SNP that can change the activity of the CYP2R1 enzyme and subsequently cause a relative lack of 25(OH)D, is significantly associate with vitamin D, but only in South Asians [31].