Objective
This study investigated the association between genetic polymorphisms in the TLR4 (rs4986790 and rs4986791) and IL6 (rs1800795) genes with obesity in a Venezuelan population.
Methods
We conducted a retrospective case-control study with 207 unrelated Venezuelans (137 obese, 70 normal weight). Blood samples were obtained to measure glucose, cholesterol, triglycerides, HDL, insulin, and insulin resistance (HOMA-IR ≥ 2.6) and genotype the TLR4 (rs4986790 and rs4986791) and IL6 (rs1800795) polymorphisms using PCR-SSP. Statistical tests: Student's t-test, Pearson correlation coefficient, chi-square test, odds ratio (OR) with 95%CI were used.
Results
The relationship between obesity and insulin resistance (IR) was confirmed. Heterozygous genotypes A/G (TLR4 rs4986790, P=.012) and C/T (TLR4 rs4986791, P=.005) were more frequent in normal-weight individuals, while homozygous genotypes A/A (TLR4 rs4986790, P=.012) and C/C (TLR4 rs4986791, P=.005) were more frequent in obese individuals. The C allele and CC genotype of IL6 rs1800795 (P=.007) were associated with obesity. The IL6 C/C genotype was associated with higher insulin and HOMA in obese individuals. In obese individuals with IR, the CC genotype (TLR4 rs4986791, P=.03) was more common, as opposted to CT, which was less common (P=.03). The C/C genotype of IL6 rs1800795 was more frequent in obese individuals with IR (P<.0001). Obese individuals with IR and the AA genotype of TLR4 rs4986790 had higher BMI, HOMA-IR, and glucose.
Conclusion
These findings suggest that genetic variations in the TLR4 and IL6 genes may predispose to obesity and its metabolic complications in the Venezuelan population.
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