Apolipoprotein E gene polymorphism and dyslipidaemia in adult Asian Indians: A population based study from Calcutta, India.

AIM: The study was aimed to determine the association of Apolipoprotein E (apo E) gene polymorphisms on lipid levels in Asian Indian population. METHODS: A total of 350 (184 males and 166 females) adult (30 years and above) Asian Indians of Calcutta and suburb participated in the study. Anthropometric measures, lipids profiles, and blood glucose measures were collected. Out of 350 subjects, a sample of 70 individuals was selected randomly for genotyping after adjusting for age and sex. The apo E gene polymorphisms were determined by agarose gel electrophoresis. RESULTS: The apo E polymorphism showed significant association with dyslipidaemia (P=0.0135) with ε3/4 combination has had the highest occurrence of dyslipidaemia and metabolic syndrome (MS) followed by ε4/4 <ε3/3 <ε2/4 <ε2/3 in decreasing order. CONCLUSIONS: The ε4 allele of apo E gene independent of other risk factors is associated with dyslipidaemia in particular with low HDLc and high TC: HDLc ratio.

Relationship between Carotid Artery Intima-Media Thickness Measured by Ultrasonography and Apolipoprotein E and Angiotensin Converting Enzyme Gene Polymorphisms in Diabetic Nephropathy / 대한신장학회잡지

BACKGROUND: We evaluated the distribution of the polymorphisms of apolipoprotein E and angiotensin converting enzyme gene in patients with diabetic nephropathy and also evaluated possible association between the apolipoprotein E carriers and angioten-sin converting enzyme genotypes and intima-media thickness of the common carotid artery. METHODS: Study participants were 92 patients with diabetic nephropathy(50 men and 42 women). Hb(A1C), albuminuria, and lipid status were assessed by standard laboratory techniques ; the apolipoprotein E carriers were assessed by modified amplification refractory mutation system and the angioten-sin converting enzyme genotypes were assessed by polymerase chain reaction. The intima-media thickness was measured by high-resolution ultrasonography. RESULTS: The apolipoprotein E frequencies of patients were E2 8%, E3 76%, and E4 16%. The intima-media thickness varied by apo E groups. E2 group has less common carotid intima-media thickness than E3 and E4 groups(p<0.05). The angiotensin converting enzyme genotypes were distributed as follows ; 35% II, 49% ID, 16% DD. The intima-media thickness value did not differ among patients with various angiotensin converting enzyme genotypes. Multiple logistic regression analysis showed that age and apolipoprotein E genotypes were determinants for the intima-media thickness. CONCLUSION: Our results suggested that apolipoprotein E polymorphism is associated with carotid artery intima-media thickness in diabetic nephropathy. But, we could not find an association between carotid artery intima-media thickness and angiotensin converting enzyme gene polymorphism in diabetic nephropathy.

Apolipoprotein E Gene Polymorphism and Plasma Lipid Levels in Male Korean Patients with Chronic Renal Failure / 대한신장학회잡지

Accelerated atherosclerosis is not only a frequent complication but also the most common cause of death in patients with chronic renal failure (CRF). Although mechanisms are unclear, disorder of lipid metabolism may be a major factor. Since apolipo-protein (apo) E is known to play a major regulatory role in lipid metabolism, we evaluated apo E genotype in 72 male patients with CRF and compared with that in 194 rnale normal controls. In addition, we measured plasma lipid and apolipoprotein concentrations and evaluated them according to apo E genotype in patients and controls. Apo E genotype was determined with the INNO-LiPA Apo E kit (Innogenetics, Belgium), which is based on reverse hybridization. The results are as follows ; 1) The distribution of the three major apo E alleles in patients with CRF ( e 2: 6.2%, e 3: 80.6%, e 4: 13.2%) was not different from that in controls ( e 2: 4.1%, e 3: 87.6%, e 4: 8.3%). 2) In patients with CRF, total cholesterol, lowdensity lipoprotein (LDL) and high-density lipoprotein (HDL) levels were significantly lower and the triglyceride and lipoprotein (a) levels were significantly higher than those in controls. 3) In controls, E 4/3 group had significantly lower levels of HDL than E 3/3 and E 3/2 groups. In patients with CRF, E 4/3 group had significantly higher levels of total cholesterol and apo B lipoprotein than E3/2 group. In conclusion, although there was no significant difference in the apo E genotype frequencies between male patients with CRF and controls, apo E polymorphism may play an important role in the determination of individual differences in plasma lipids in male patients with CRF.

Influences of the Apolipoprotein E Polymorphism on the Development of Coronary Artery Disease and on Serum Lipids in the Korean Males

BACKGROUND: Apo E lipoprotein is polymorphic and exists in three common isoforms (E2, E3 and E4), which are the gene products of three apo E alleles, e2, e3 and e4. Apo E lipoprotein plays an important role in the regulation of the lipid metabolism through its ability to bind to receptors. Depending on the genotypes apo E polymorphism is either protective or increases risk for atherosclerosis and coronary artery disease. The purpose of this study is to evaluate 1) the association between apo E allele and the development of coronary artery disease, 2) the association between apo E alleles and dyslipidemia in Korean males. METHODS: We studied 241 patients with angiographically verified coronary artery disease and 257 male subjects without evidence of coronary artery disease. Apo E genotyping was determined with the INNO-LiPA Apo E kit (Innogenetics, Belgium), which is based on reverse hybridization. RESULTS: There was a higher frequency of the apo e4 allele in subjects with coronary artery disease than in normal controls. The frequencies of apo E genotype were not significantly associated with apo e2 were associated with higher levels of triglyceride and lower LDL, and the subjects with apo e4 had lower levels of HDL cholesterol. CONCLUSION: ApoE polymorphism is a genetic marker for risk of the development of coronary artery disease and an important determinant of dyslipidemia.

Correlation between Apolipoprotein E Polymorphism and Plasma Lipid Levels in the Korean Males

BACKGROUND: Apo E lipoprotein is made up of 299 amino acid and is classified into three major isoforms(E2, E3 and E4). Aop E lipoprotein plays an important role in the regulation of the lipid metabolism. The purpose of this study is to evaluate the variations of plasma lipids depending on the apo E genotype in the Korean males. METHODS: We studied 257 male subjects without evidence of coronary artery disease. Apo E genotyping was determined with the INNO-line probe assay apo E test, which is based on reverse hybridization. RESULTS: Apo E genotype frequencies for 257 subjects were as follows, 73.9% for epsilon3/3, 16% for epsilon4/3, 8.2% for epsilon3/2, 1.2% for epsilon2/2, and 0.8 for epsilon4/4. We found significant differences in apo E allele frequencies of our subjects campared with those of western populations. Compared to the subjects with apo epsilon3, the subjects with apo epsilon2 was associated with higher levels of triglyceride, and the subjects with apo epsilon4 had lower levels of HDL cholesterol. CONCLUSION: The frequencies of apeE genotype varies depending on the ethnic origin. ApoE polymorphism plays an important role in determining individual differences in plasma lipids.