Role of genetic factors (CETP gene Taq I B polymorphism and Apo A-I gene Msp I polymorphism) in serum HDL-C levels in women

Deciphering the association of cholesteryl ester transfer protein (CETP) gene polymorphisms with high-density lipoprotein cholesterol (HDL-c) levels in the Bangladeshi population

Cholesteryl ester transfer protein (CETP) gene polymorphisms influence CETP expression and high-density lipoprotein cholesterol (HDL-c) levels, yet their genetic impact remains unexplored in the Bangladeshi population, where low HDL-c is prevalent. This study examined the association of CETP -629C/A and 277C/T polymorphisms with circulating HDL-c levels in 402 individuals (217 males, 185 females). Serum lipid profiles were measured using an automated analyzer, and CETP polymorphisms were genotyped using PCR-RFLP. The -629C/A and 277C/T polymorphisms were in Hardy-Weinberg equilibrium, with heterozygous genotypes being the most frequent. While -629C/A genotypes showed no significant difference between the high and low HDL-c groups, individuals carrying the -629AA and CA + AA genotypes had significantly higher HDL-c levels compared to CC carriers (p = 0.023, p = 0.043). For the 277C/T, TT genotype differed significantly between the high and low HDL-c groups (p = 0.011, OR = 0.37) and, individuals carrying the 277 TT and CT + TT genotypes had significantly higher HDL-c compared to the CC genotype (p = 0.002, p = 0.019). Additionally, allelic analysis suggested a marginal association between the 277T allele and increased HDL-c levels (p = 0.051, OR = 0.59). Multiple regression analysis confirmed an inverse association between -629CC (β = -1.106, p = 0.038) and 277CC + CT (β = -0.963, p = 0.016) with HDL-c levels. However, no significant differences were observed in total cholesterol, triglycerides, LDL-c, or apolipoprotein levels across genotypes. These findings suggest that CETP -629CC, 277CC, and CT genotypes contribute to low HDL-c levels in the Bangladeshi population, highlighting the potential role of CETP genetic screening as a biomarker for identifying individuals at risk of HDL-c deficiency and associated cardiovascular complications.

Cholesteryl ester transfer protein TaqIB polymorphism and its relation to parameters of the insulin resistance syndrome in an Austrian cohort

The cholesteryl ester transfer protein (CETP) is responsible for the exchange of triglycerides and cholesteryl esters between lipoprotein particles leading to an increased hepatic clearance of HDL-cholesteryl esters. A high CETP activity reduces serum HDL levels, whereas persons without CETP activity have high HDL levels. We investigated the association of the TaqIB CETP polymorphism and various parameters of the insulin resistance syndrome in a cross sectional population based study. We included 1029 persons without known cardiovascular disease or diabetes mellitus consecutively enrolled in our SAPHIR program (Salzburg Atherosclerosis Prevention program in persons with a High Infarction Risk). Numerous clinical and laboratory data were accomplished. Insulin sensitivity was measured by a short insulin tolerance test. The TaqIB CETP polymorphism was determined by PCR, TaqI restriction and electrophoresis. 35.2% were homozygous for the prevalence (B1B1), 46.7% were heterozygous (B1B2), and 18.1% homozygous for the absence (B2B2) of the restriction site. HDL cholesterol and apolipoprotein A1 were lower and small dense low-density lipoproteins (sdLDL) higher in B1B1 compared to B2B1 and B2B2 persons. In women, we found a significant interaction effect between CETP genotype and adiposity for HDL cholesterol. B1B1 women with a BMI and a waist circumference above the median had 9.7 mg/dl lower HDL than B1B2 and 9.1 mg/dl lower HDL than B2B2 women (P < 0.001). In men, no interaction effect but a marked genotype to HDL correlation was found. There was a high CETP effect on sdLDL detected in men (P = 0.001). B1B1 men had sdLDL in 36%, B1B2 in 24.6%, and B2B2 in only 14.5%. Men with adiposity and insulin resistance had twice as many sdLDL as insulin sensitive men. We found a significant sex specific effect of the TaqIB CETP polymorphism on the insulin resistance parameters HDL-cholesterol and sdLDL in an Austrian population based study.

APOA1 polymorphisms are associated with variations in serum triglyceride concentrations in hypercholesterolemic individuals

Background: Apolipoprotein A-I gene (

Methods:

Results: G–75A polymorphism was associated with differences in serum concentrations of triglyceride and very low-density lipoprotein (VLDL)-cholesterol (p=0.026) in HC men. After atorvastatin treatment, women carrying the

Conclusion: Our data suggest that