The Role of Pharmacogenetics in the Treatment of Diabetes Mellitus / ULOGA FARMAKOGENETIKE U LEČNJU DIJABETES MELITUSA

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Summary

Diabetes mellitus is a heterogeneous group of disorders in which particular disease phenotypes can be characterized by a specific etiology and/or pathogenesis of the disease, but in many cases its classification is greatly impeded due to significant phenotype overlapping. Diabetes is a wordwide epidemic with significant health and economic consequences. The frequency of type 2 diabetes (T2D) is much higher than type 1 diabetes (T1D). In adults, around 285 million people suffer from T2DM with a projected rise to 438 million in the next 20 years. A variety of pharmacological treatments exist for patients with T2D, in addition to dietary and physical activity. Pharmacologically, diabetes is treated with nine major classes of approved drugs, including insulin and its analogues, sulfonylureas, biguanides, thiazolidinediones (TZDs), meglitinides, a-glucosidase inhibitors, amylin analogues, incretin hormone mimetics, and dipeptidyl peptidase 4 (DPP4) inhibitors. Treatment strategy for T2D is based mostly on oral hypoglycemic drug (OHD) efficacy assessed usually by HbA1c and/or fasting plasma glucose. The patients are often treated with more than one OHD in combination with the purpose to receive more effective treatment. Characterization of drug response is expected to substantially increase the ability to provide patients with the most effective treatment strategy. If pharmacogenetic testing for diabetes drugs could be used to predict treatment outcome, appropriate measures could be taken to treat T2D more efficiently. To date, major pharmacogenetic studies have focused on response to sulfonylureas, biguanides, and TZDs, the most used OHD. A comprehensive review of the pharmacogenetic studies of specific OHD is presented in this article. Understanding the pharmacogenetics of these drugs will provide critical baseline information for the development and implementation of a genetic screening program into therapeutic decision making, enabling a personalized medicine approach for T2D patients.

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