Gender-related relation between metabolic syndrome and S447X and HindIII polymorphisms of lipoprotein lipase gene in northern Iran

BACKGROUND

Metabolic syndrome is a cluster of conditions that increase risk of cardiovascular morbidity and mortality. Among genetic factors that contributed to incidence of metabolic syndrome, Polymorphisms of Lipoprotein lipase (LPL) are major candidates especially because of their effect on obesity and dyslipidemia. S447X (rs328) and Hind III (rs320) Polymorphisms of LPL gene have been reported to change LPL activity, resulting in altered triglyceride (TG) and high density lipoprotein Cholesterol (HDL-C) levels. This study investigates the effects of these gene polymorphisms on factors affecting metabolic syndrome in northern population of Iran.

METHODS

Studied population included 223 adults consisting 90 women and 133 men with body mass index (BMI) ≥ 30 kg/m² as obese subjects, and 156 healthy participants as a control group with BMI <25 that included 68 women and 88 men. All factors causing metabolic syndrome were evaluated. Also DNA was extracted from blood samples and HindIII and S447X LPL gene polymorphisms were screened by polymerase chain reaction-restriction fragment length polymorphism method (PCR-RFLP).

CONCLUSIONS

The present study proves that some genotypes of S447X were associated with a reduced risk of developing low HDL-C only in men, while the protective effects of HindIII on hypertriglyceridemia were only seen in women [corrected]. The point is that this relation is affected by the weight profile of the participants. It can be concluded that there is a gender-related relation between the polymorphisms of LPL gene and the risk factors for incidence of metabolic syndrome in the northern population of Iran.

Synergistic effect between lipoprotein lipase and apolipoprotein C3 genes in determining the severity of coronary artery disease

A number of genetic variants have been identified in the lipoprotein lipase (LPL) gene. We aimed to investigate the possible associations between LPL gene and apolipoprotein C3 (APOC3) gene polymorphisms with coronary artery disease (CAD) and its severity, as well as the interaction between these polymorphisms and classical risk factors. The HindIII variant of LPL and APOC3 were genotyped in 156 CAD patients and 154 subjects as a control group. We found that the odds ratio (OR) estimating the effect of joint exposure to H2H2 genotype of LPL and S2S2 genotype of APOC3 was significantly higher than the OR estimating the effect of each factor in the absence of the other. The present study points to a synergistic interaction between H2H2 genotype of LPL gene and S2S2 genotype of APOC3 gene that leads to increased severity of CAD. Smoking, low HDL, and diabetes increased the severity of CAD in patients carrying these risky genotypes.