Resumo

GARCES, María Fátima et al. GLY972ARG plymorphism in the insulin receptor substrate 1 Gene in prepubertal children with cardiometabolic risk. Arch Venez Puer Ped [online]. 2015, vol.78, n.1, pp.18-26. ISSN 0004-0649.

Introduction: Insulin receptor substrate 1 (IRS-1) is an important component of the insulin signal transduction cascade and could be related with metabolic disorders associated with metabolic syndrome (MS). Aim: Evaluate the role of the Gly972Arg polymorphism in the IRS1 gene in prepubertal children with cardiometabolic risk factors. Methods: We studied 279 children between 2-12 years of age, divided in groups 3 groups: a) obese children without insulin resistance (IR) (n=135), b) obese children with IR (n=80) and c) healthy children as controls (n=64). Basal and postprandial glucose, insulin, triglycerides, total and fractionated cholesterol and genotype frequency of the Gly972Arg SNP were determined in fasting and postprandial samples in each child. Results: 37.5% of the children had IR; in the fasting state, 9.6% had hyperglycemia, 27.3% hypertriglyceridemia and 50.46 % low HDL-C. The genotypic frequency was 89% for the Gly / Gly genotype and 11% Gly / Arg genotype. Significant difference was found in the distribution of the different genotypes of the IRS1 gene in children with overweight/obesity without IR and children with overweight/obesity with IR compared to the control group (OR = 4.47;CI 95% = 0.96-16.92; p <0.05) and (OR = 4.43; CI 95%= 0.93 - 21.00, p <0.05) respectively. Conclusion: Association between the presence of Gly/Arg genotype of the IRS1 gene with overweight/obesity (cardiometabolic risk factor) was observed in the studied children. These children were four times more likely to be overweight/obese than children with Gly / Gly genotype.

Palavras-chave : Gly972Arg Polymorphism; IRS1 Gene; Metabolic Syndrome; Insulin Resistence; obesity.