title: The rs2070895 (-250G/A) Single Nucleotide Polymorphism in Hepatic Lipase (HL) Gene and the Risk of Coronary Artery Disease in North Indian Population: A Case-Control Study.
abstract: BACKGROUND
  Several Single Nucleotide Polymorphisms (SNPs) in lipid transport genes have been shown to be associated with Coronary Artery Disease (CAD). The Hepatic Lipase (HL)glycoprotein is a key component that catalyzes the hydrolysis of triglycerides and phospholipids in all major classes of lipoproteins.
  
  
  OBJECTIVE
  We studied whether the HL gene-250G/A polymorphism affect blood lipid level and the CAD in a North Indian population.
  
  
  METHODS
  A total number of 477 subjects were enrolled in the study after approval of the Institutional Ethics Committee. Out of 477 subjects, 233 were with coronary artery disease as study group and 244 subjects without coronary artery disease as control group. All subjects recruited with matched ethnicity in age group of 40-70 years. Blood samples were collected in EDTA vials and genomic DNA was extracted from blood using the phenol-chloroform method. Lipid profile was estimated by using a commercially available kit. Polymorphisms in the HL (-250 G/A) gene were analysed by using restriction fragment length polymorphism-polymerase chain reaction (PCR-RFLP) method. The effect of this polymorphism on plasma lipids, lipoproteins and coronary artery disease was determined.
  
  
  RESULTS
  In Human Hepatic Lipase (LIPC)-250G/A genotype, the frequencies of GG, GA and AA genotype in CAD group was 80.69%, 15.45% and 3.86%, respectively; in the control group, the corresponding frequencies were 90.16%, 9.02% and 0.82%, respectively. A significant difference was found in the genotype (LIPC-250G/A) distribution between the two groups. Further logistic regression analysis indicated that the GA and AA genotypes in SNP-250G/A were significantly associated with CAD in all genetic models (In codominant model- GA vs. GG, OR=1.91, 95% CI=1. 09-3.37, p=0. 03 and AA vs. GG, OR= 5.26, 95% CI= 1.10-24.60, p=0.04; in dominant model- GA+AA vs. GG, OR=2.19, p=0.004 and in recessive model- AA vs. GG+GA, OR=5.26, p=0.04 whereas, A allele at nucleotide -250G/A in the LIPC gene had an association with increased risk of CAD (OR=2.33, p=<0.008).
  
  
  CONCLUSIONS
  Our findings indicated that the higher frequency of a dominant model (GA+AA) as well as mutant allele A of LIPC-250 G/A polymorphism is significantly associated with risk of CAD and the lipid profile can be used as a predictor of CAD.
authors.affiliation: Ph.D Student, Department of Physiology, King George's Medical University , Lucknow, Uttar Pradesh, India .
authors.forename: Pratima
authors.initials: P
authors.lastname: Verma
authors.affiliation: Associate Professor, Department of Physiology, King George's Medical University , Lucknow, Uttar Pradesh, India .
authors.forename: Dileep Kumar
authors.initials: DK
authors.lastname: Verma
authors.affiliation: Professor, Department of Cardiology, King George's Medical University , Lucknow, Uttar Pradesh, India .
authors.forename: Rishi
authors.initials: R
authors.lastname: Sethi
authors.affiliation: Professor, Department of Physiology, King George's Medical University , Lucknow, Uttar Pradesh, India .
authors.forename: Shraddha
authors.initials: S
authors.lastname: Singh
authors.affiliation: Scholar, Department of Physiology, King George's Medical University , Lucknow, Uttar Pradesh, India .
authors.forename: Akhilesh
authors.initials: A
authors.lastname: Krishna
keywords: HDL-C; HL activity; LIPC gene; Low density lipoprotein; Polymorphisms