Effect of SLC30A8 rs13266634 Genetic Polymorphism on Zinc Supplementation and Glycemic Control in Egyptian Patients With Type 2 Diabetes Mellitus

Inclusion Criteria: * Established diagnosis of type 2 diabetes mellitus. * Age between 20 and 64 years. * BMI \< 40 kg/m2. * On fixed oral hypoglycemic dosage for at least 3 months. * Normal serum creatinine (0.5 to 1.3 mg/dL) with no clinical evidence suggestive kidney disease. * Normal liver function tests (ALT 7 to 55 U/L, and albumin ˃ 3.5 g/dL). Exclusion Criteria: * Those diagnosed of osteomalacia, chronic alcoholics. Patients with type 1 Diabetes Mellitus. * Those who were taking multivitamin containing zinc or magnesium or any sort of mineral supplements in the previous three months or hormone replacement therapy (estrogen, progesterone) or chelating therapy such as penicillamine, or anticonvulsant (phenytoin, valproate). * Those with a history of recent surgery or with concurrent acute illness including infectious disease, trauma, inflammatory bowel disease, malignancy, and active immunological diseases, using corticosteroids. * Pregnant or intend to be pregnant for t least 3 months or lactating women. * Those who were receiving insulin preparations as a part of diabetes management.