title: Differential effect of two common polymorphisms in the cholesteryl ester transfer protein gene on low-density lipoprotein particle size.
abstract: This study was performed to determine the relationship between the two common polymorphisms of cholesteryl ester transfer protein (CETP) gene and LDL size in Japanese individuals. The LDL size was determined by gradient gel electrophoresis in 136 patients undergoing routine check-ups. The presence of two polymorphisms (I405V and Taq1B) was determined using PCR-based methods. The VV genotype for the I405V polymorphism was associated with both a lower plasma CETP concentration and a higher plasma HDL-C concentration. Further, the LDL size in patients with the VV genotype was significantly smaller than that in patients with the II+IV genotype (26.0 +/- 0.8 vs. 26.3 +/- 0.7 nm, P<0.05). Although the B2B2 genotype for the Taq1B polymorphism was also associated with both a lower plasma CETP concentration and a higher plasma HDL-C concentration, it had no effect on the LDL size (26.2 +/- 0.7 vs. 26.3 +/- 0.8 nm, P=0.73). Stepwise multiple regression analysis revealed that the VV genotype, as well as plasma TG concentration, age, HbA1c concentration, and BMI, were determinants of LDL size, while no significant relationships were seen between any of the Taq1B polymorphisms and LDL size. These data suggest that the I405V polymorphism but not the Taq1B polymorphism may be responsible for the distribution of LDL size. This may explain the differential effects of these two polymorphisms on the risk of CHD.
authors.affiliation: Internal Medicine II, Nagoya University School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya 466-8550, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Okumura
authors.forename: Hideo
authors.initials: H
authors.lastname: Matsui
authors.forename: Hiroki
authors.initials: H
authors.lastname: Kamiya
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Saburi
authors.forename: Kazunori
authors.initials: K
authors.lastname: Hayashi
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Hayakawa
mesh_terms: D000328:Adult; D000368:Aged; D000483:Alleles; D044466:Asian People / Q000235:genetics*; D002352:Carrier Proteins / Q000235:genetics*; D053480:Cholesterol Ester Transfer Proteins; D008078:Cholesterol, LDL / Q000097:blood*; D005260:Female; D005786:Gene Expression Regulation; D006023:Glycoproteins; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D010316:Particle Size; D011110:Polymorphism, Genetic; D011336:Probability; D011401:Promoter Regions, Genetic; D011446:Prospective Studies; D012044:Regression Analysis; D012680:Sensitivity and Specificity
chemical_list: C506642:CETP protein, human; D002352:Carrier Proteins; D053480:Cholesterol Ester Transfer Proteins; D008078:Cholesterol, LDL; D006023:Glycoproteins