DPP4 and diabetes mellitus: *Affected relative. †Different amino acid reported in this position in subject with diabetes in the literature. ‡At median 10 years from diagnosis of diabetes. DM - diabetes mellitus. BMI - body mass index. IFG - impaired fasting glucose. SIFT - Sorting Intolerant From Tolerant. PPH2 - Polyphen 2. N – predicted as neutral. D - predicted as damaging. SU – sulphonylurea derivatives. DPP4I - dipeptidyl peptidase 4 inhibitor. N/A - not available.