Role of resistin (rs7139228) gene polymorphism with metabolic response after a hypocaloric mediterranean diet.

BACKGROUND: The SNP (rs7139228) of the RETN gene is a polymorphism that has been associated with metabolic disorder in subjects with obesity, and its effect on metabolic response after dietary intervention has not been evaluated. OBJECTIVE: Our objective was to analyse the effects of the polymorphism of the RETN gene rs7139228 on metabolic changes secondary to weight loss with a hypocaloric Mediterranean diet. DESIGN: 1000 obese Caucasian patients were evaluated. An anthropometric evaluation and a biochemical analysis were performed before and after 12 weeks of a hypocaloric Mediterranean diet. The statistical analysis was performed as a dominant model (GG vs GA+AA). RESULTS: Improvements in anthropometric parameters, leptin levels and systolic blood pressure were similar in both genotype groups. In non- A allele carriers, levels of resistin, insulin, HOMA-IR, triglycerides and C-reactive protein decreased. The improvements were statistically significant in this group; resistin (-1.3+0.1ng/dL: p=0.02), triglycerides (-22.9+4.9mg/dl: p=0.02), CRP (-2.7+0 0.4mg/dl: p=0.02), insulin -6.5+1.8 mIU/L: p=0.02) and HOMA-IR (-2.2+0.8: p=0, 03). In addition, insulin, HOMA-IR and resistin levels were higher in A allele carriers than in non-carriers. Finally, the prevalence of metabolic syndrome and hyperglycaemia were higher in A allele carriers, and these percentages only decreased after intervention in non-A allele carriers. CONCLUSION: The A rs7139228 allele is associated with a worse metabolic response (insulin, HOMA-IR, triglycerides and CRP) after weight loss with a hypocaloric Mediterranean diet. A non-significant decrease in the prevalence of metabolic syndrome and hyperglycaemia were detected in A allele carriers.