Association of Perilipin and Insulin Receptor Substrate-1 Genes Polymorphism with Lipid Profiles, Central Obesity, and Type 2 Diabetes in a Sample of an Iranian Population

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.
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).
In this randomized case-control study (Feb, 2016 to Sep, 2016), we genotyped 200 patients with T2D and the same number (200) of controls by using the combined nested-polymerase chain reaction (PCR) as well as the amplification refractory mutation system (ARMS)-PCR for IRS-1 variant and Tetra-ARMS-PCR for PLIN variant in southeast Iran (Zahedan).
The polymorphism of 4578621 in the PLIN gene was associated with T2D. GG genotype and G allele at rs4578621of PLIN gene were significantly higher in patients than in controls (for the G allele: OR = 2.31, 95%CI = 1.55 - 3.46, P The rs2943641 polymorphism of the IRS-1 gene is a major genetic determinant of obesity but not Type 2 diabetes and lipid profiles. The rs4578621 polymorphism of the PLIN gene related with T2D and TG but not obesity.