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Apolipoprotein E polymorphism in Northern Indian patients with coronary heart disease: Phenotype distribution and relation to serum lipids and lipoproteins
Authors:Luthra  Kalpana  Bharghav  Balram  Chabbra  Shivani  Das  Nibhriti  Misra  Anoop  Agarwal  Dharam P  Pandey  Ravindra M  Srivastava  LM
Institution:Department of Biochemistry, All India Institute of Medical Sciences, New Delhi. kalpanaluthra@hotmail.com
Abstract:Apolipoprotein E (apo E), a genetic determinant of plasma lipid levels and coronary heart disease (CHD) needs to be investigated in Asian Indians since they have a propensity to develop dyslipidemia and accelerated atherosclerosis. We studied apo E phenotypes and plasma lipid levels in 52 Northern Indian male patients (aged 38–71 years) with angiographically proven CHD, and compared them to 50 healthy blood donors taken as the control group. High levels of Lp(a), (p < 0.05), and a definite trend towards lower levels of HDL-C (p < 0.05), was observed in the CHD patients as compared to the control subjects. The frequency of apo E allele epsi3 was 0.86 and 0.862, and epsi4 allele was 0.12 and 0.08 in the patients and controls, respectively. However, a lower frequency of the E2 allele was observed in the patient group (epsi2 = 0.02) as compared to the controls (epsi2 = 0.06) (p = ns). In individuals with apo E3/E3 phenotype, significantly lower HDL-C levels was observed in the CHD patients as compared to the control subjects (p < 0.05). A positive correlation was observed between apo E phenotypes and Lp(a) levels in the CHD subjects as compared to the controls (p < 0.05), the level being significantly high in CHD subjects with at least one E4 allele. To conclude, in this sample of Northern Indian subjects with CHD, there is a significant correlation between apo E3/E3 phenotype and low levels of HDL-C as compared to the control subjects. Further, apo E phenotype is positively correlated with high Lp(a) levels in the CHD subjects having at least one E4 allele. However, these relationships need to be explored in a larger sample of subjects.
Keywords:apolipoprotein E polymorphism  phenotyping  coronary heart disease  Northern Indians  high-density lipoprotein cholesterol  lipoprotein(a)
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