title: Common variants of ABCB4 and ABCB11 and plasma lipid levels: a study in sib pairs with gallstones, and controls.
abstract: Most epidemiological surveys have confirmed the association of low HDL-cholesterol and high triglyceride levels with cholesterol gallstones. Our objective was to analyze the relationship between plasma lipid levels and common polymorphisms of ABCB11 (encoding the bile salt export pump, BSEP) and ABCB4 (encoding the phospholipid transporter into bile, MDR3) genes. Plasma lipids were measured in 108 index patients of sib pairs with gallstones and in 260 controls. Using PCR-based assays with 5'-nuclease and fluorescence detection (TaqMan), the ABCB11 coding SNP p.A444V and four haplotype-tagging SNPs covering the ABCB4 gene (c.504C > T, c.711T > A, p.R652G, rs31653 in intron 26) were genotyped. Plasma lipids were compared in carriers of the common versus rare allele of these polymorphisms using Student's t test and Pearson's correlation. BMI and triglyceride levels were higher and HDL-cholesterol levels were lower in affected siblings than in controls. Among cases, triglyceride and cholesterol levels were higher in carriers of the common versus rare (hetero/homozygous carriers) allele of the SNPs p.A444V of ABCB11 and C.504C > T of ABCB4. HDL-cholesterol was lower in carriers of the common allele of rs31653. In controls, significant differences of cholesterol and HDL-cholesterol levels were found in carriers of ABCB4 polymorphisms. Our results do not support the hypothesis of a link between ABCB4 and ABCB11 polymorphisms, lithogenic dyslipidemia, and gallstone risk.
authors.affiliation: 3rd Medical Clinic, University Iuliu Hatieganu, Cluj-Napoca, Romania. monacal@umfcluj.ro
authors.forename: Monica
authors.initials: M
authors.lastname: Acalovschi
authors.forename: Simona
authors.initials: S
authors.lastname: Tirziu
authors.forename: Erica
authors.initials: E
authors.lastname: Chiorean
authors.forename: Marcin
authors.initials: M
authors.lastname: Krawczyk
authors.forename: Frank
authors.initials: F
authors.lastname: Grünhage
authors.forename: Frank
authors.initials: F
authors.lastname: Lammert
mesh_terms: D018435:ATP Binding Cassette Transporter, Subfamily B / Q000235:genetics*; D000074020:ATP Binding Cassette Transporter, Subfamily B, Member 11; D018528:ATP-Binding Cassette Transporters / Q000235:genetics*; D000483:Alleles; D005260:Female; D042882:Gallstones / Q000097:blood* / Q000235:genetics*; D014644:Genetic Variation; D005838:Genotype; D006801:Humans; D008055:Lipids / Q000097:blood*; D008297:Male; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic; D035781:Siblings
chemical_list: C093491:ABCB11 protein, human; D018435:ATP Binding Cassette Transporter, Subfamily B; D000074020:ATP Binding Cassette Transporter, Subfamily B, Member 11; D018528:ATP-Binding Cassette Transporters; D008055:Lipids; C095122:multidrug resistance protein 3