Association of the APOAI-CIII-AIV gene cluster polymorphisms with the level of lipids in Tehranian population

Changes in lipids and apo lipoproteins levels are considered a risk factor for cardiovascular disease. The APOAI-CIII-AIV gene cluster plays an important role in regulating of the metabolism and level of lipids. The aim of this study was to elucidate the associations of five single nucleotide polymorphisms in the Apo11q cluster gene with lipid levels. A cross-sectional study of 823 subjects [340 males and 483 females] from the Tehran Lipid and Glucose Study [TLGS] was performed. Anthropometrical and serum concentrations of TG, Chol, HDL, Apo AI, Apo AIV, Apo B, Apo CIII were measured. The segments of the APOAI-CIII-AIV gene cluster were amplified by PCR and the polymorphisms were revealed by RFLP using restriction enzymes. Allele frequencies of each SNP did not differ significantly between males and females. Genotypes and alleles distributions were in Hardy-Weinberg equilibrium, except for Apo AI [+83C>T]. Results demonstrated a significant association between TG, HDL-C, HDL2, Apo AI and Apo B levels and the presence of some alleles in the polymorphisms studied. After haplotype analysis not only did the association between these variables and SNPs remain, but the levels of total cholesterol and LDL-C were also added. The results of the present study showed that in addition to environmental factors, genetic variations are also important in the regulation of the metabolism and level of lipids such as TG and HDL-C

Genetic association between metabolic syndrome and apolipoproteins

Metabolic syndrome, a collection of risk factors for cardiovascular risk factors, refers to a cluster of symptoms, the simultaneous occurrence of which in a person is more likely than the occurrence of each perse. The criteria proposed by the International Diabetes Federation for the diagnosis of this syndrome include central obesity, increased triglycerides, decreased HDL-C, hypertension, and increased fasting blood sugar. Signs of metabolic syndrome can be determined through the interconnected physical and chemical changes in the human body, genetic and environmental factors. One of the most effective factors in metabolic syndrome is change in the lipid profiles. Based on the roles of apolipoproteins in lipid metabolism, the possibility of their role in metabolic syndrome has been documented. The aim of this review is to evaluate the genetic roles of apolipoproteins in metabolic syndrome. Overall, the evidence suggests that the apolipoproteins A particularly APOA5 more associated with this syndrome. On the other hand, despite the prominent role of apolipoprotein B in fat metabolism, there is no evidence on any correlation between B-100 apolipoprotein and lipoproteins such as HDL and triglyceride levels of the symptoms of metabolic syndrome

G360t polymorphism in the APO AIV gene and its association with combined HDL/LDL-cholesterol phenotype: Tehran lipid and glucose study

Identifying genetic polymorphisms as risk factors for complex diseases can facilitate their prevention, diagnosis, and prognosis. The purpose of this study is to assess the association between Apo AIV polymorphism and lipid factors based on high density lipoprotein cholesterol [HDL-C] levels in a population of the Tehran Lipid and Glucose Study [TLGS]. A total of 181 elderly TLGS subjects with Combined HDLC/low density lipoprotein-Cholesterol [LDL-C] phenotype were investigated. The distributions of a polymorphic site in the apolipoprotein gene APO AIV and its relationship with total cholesterol, LDL-C, HDL-C, and triglycerides were investigated in subjects with LDL-C> 121 mg/dL and HDL-C< 40 mg/dL [case group] and those with LDL-C< 90 mg/dL and HDL-C> 50 [controls]. All the variables studied in the case and control groups were statistically different. At the APO AIV locus the G360T polymorphism at codon 360 showed a significant impact on total cholesterol [G: 211 +/- 1.16 vs, T: 228 +/- 1.20 mg/dL p 0.038] concentration in the case group and on Apo CIII [G: 157 +/- 66.9 vs, T: 83.18 +/- 17.1 mg/dL p <0001] level in the controls. These associations remained after adjustment for age, sex and smoking [P values: P Chol: 0.028 and P Apo CIII: 0.021]. Difference in the apolipoprotein AIV [G360T] polymorphism in the two groups with the combined HDL/LDL-C phenotype indicates that this phenotype can be a selective phenotype for genetic analysis in this field

[Allele frequency of C-482T polymorphism in apolipoprotein CIII gene in a tehranian population: Tehran lipid and glucose study]

Apoc3, an apolipoprotein, is well known as a lipolysis inhibitor. It inhibits lipolysis by both HP and LPL activity inhibition and has been studied as a factor for hypertriglyceridemia for years. C-482T polymorphism in apoc3 gene promoter has associated with hypertriglyceridemia and insulin resistance, factors associated with the metabolic syndrome association factors. Subjects were randomly selected from the Tehran Lipid and Glucose Study. A 231 bp segment of the mentioned gene was amplified by PCR and the polymorphism revealed by RFLP using the MspI restriction enzyme. Allele frequencies obtained for APOC3-482C and-482T polymorphisms were 0.653 and 0.347 respectively. Genotype frequencies were in conformity with the Hardy-Weinberg expectation. The observed genotype and allele frequencies were similar to those reported for other Caucasians samples. The data generated from this study will be of importance in the context of ongoing studies concerning the factors that influence lipid levels in Iranian populations