title: Gln-Arg192 polymorphism of paraoxonase 1 is associated with carotid intima-media thickness in patients of type 2 diabetes mellitus of Chinese.
abstract: Serum paraoxonase (PON) is a high-density lipoprotein-bound enzyme that can prevent oxidation of low-density lipoprotein by hydrolyzing lipid peroxides and thus exert an anti-atherogenic effect. Recent studies have suggested that glutamine(Q isoform)/arginine(R isoform) polymorphism at position 192 of PON(1) gene is associated with macrovascular disease of type 2 diabetes mellitus (T2DM). We re-investigated this relationship using carotid intima-media thickness (IMT) as a surrogate continuous variable for macroangiopathy. The genotype and allele frequency of PON(1) 192 Q/R polymorphism was assayed by polymerase chain reaction-restriction fragment length polymorphism in 152 type 2 diabetic patients and 128 healthy subjects from a population of Chinese Han nationality in ChengDu area. The carotid IMT was measured by B-mode ultrasonography in type 2 diabetic patients. No differences were found in PON(1) gene Q/R polymorphism in the type 2 diabetic patients when compared with the control group. The mean carotid IMT in type 2 diabetic subjects with the QQ, QR and RR genotype was 0.65+/-0.27, 0.83+/-0.27 and 1.05+/-0.32 mm, respectively. One-way ANOVA showed that IMT was significantly greater in the RR subgroup than in both QR and QQ subgroups (P<0.01). Multivariate logistic regression analysis showed R allele to be the main determinant of IMT variability (OR 4.0 95% CI 2.10-7.40 P=0.005). Our data support the view that 192 R allele of PON(1) gene is a risk factor for macrovascular disease of T2DM in Chinese.
authors.affiliation: Division of Endocrinology, Department of Internal Medicine, West China Hospital, SiChuan University, 37 Guo Xue Lane, ChengDu 610041, PR China.
authors.forename: YaoMin
authors.initials: Y
authors.lastname: Hu
authors.forename: HaoMing
authors.initials: H
authors.lastname: Tian
authors.forename: Rui
authors.initials: R
authors.lastname: Liu
mesh_terms: D019943:Amino Acid Substitution; D001120:Arginine / Q000235:genetics*; D043303:Aryldialkylphosphatase / Q000235:genetics*; D044466:Asian People / Q000235:genetics; D001483:Base Sequence; D015992:Body Mass Index; D002339:Carotid Arteries / Q000473:pathology*; D002681:China; D017931:DNA Primers; D003924:Diabetes Mellitus, Type 2 / Q000201:enzymology / Q000235:genetics* / Q000473:pathology; D005260:Female; D005838:Genotype; D005973:Glutamine / Q000235:genetics*; D006801:Humans; D008297:Male; D008875:Middle Aged; D020125:Mutation, Missense; D016133:Polymerase Chain Reaction; D017539:Tunica Intima / Q000473:pathology*; D017540:Tunica Media / Q000473:pathology*
chemical_list: D017931:DNA Primers; D005973:Glutamine; D001120:Arginine; D043303:Aryldialkylphosphatase