Background: Since insulin receptor substrate-1 (IRS-1) is the main substrate of the insulin receptor tyrosine kinase and has been detected to activate phosphatidylinositol (PI) 3-kinase and promote GLUT4 translocation, the IRS-1 gene is a possible candidate for development of type2 diabetes, insulin resistance, and obesity. Preilipin (PLIN) coats intracellular lipid droplets and modulates adipocyte lipolysis. Objectives: In this study, we investigated whether insulin receptor substrate-1 (IRS-1) and Perilipin (PLIN) genes polymorphism were associated with Type 2 diabetes (T2D), obesity, and lipid profiles in a sample of the Iranian population (Southeast of Iran). Methods: In this randomized case-control study (Feb, 2016