title: XbaI polymorphism of the apolipoprotein B gene influences plasma lipid response to diet intervention.
abstract: Fresh blood samples were collected from 103 North Karelians who had in 1981-84 participated in dietary intervention studies and analysis of the XbaI restriction fragment length polymorphism (RFLP) of apolipoprotein B (apoB) was carried out. Reanalysis of the original plasma lipid and apolipoprotein data indicated that while baseline concentrations did not differ significantly between genotypes, the response to a low-fat, low-cholesterol diet was influenced by apoB XbaI genotype: reductions in total and low density lipoprotein (LDL) cholesterol, apoB and high density lipoprotein (HDL) cholesterol were greater in subjects homo- or heterozygous for the presence of the XbaI cutting site (X1X2 or X2X2 genotype, designated X2+) as compared to those lacking the cutting site (X1X1 genotype, designated X2-). The corresponding average reductions induced by dietary intervention in X2+ and X2- subjects were: for total cholesterol 1.30 and 0.99 mmol/l (p = 0.036), for LDL cholesterol 1.04 and 0.78 mmol/l (p = 0.049), for apoB 18.3 and 8.1 mg/100 ml (p = 0.012) and for HDL cholesterol 0.26 and 0.17 mmol/l (p = 0.008).
authors.affiliation: First Department of Medicine, University of Helsinki, Finland.
authors.forename: M J
authors.initials: MJ
authors.lastname: Tikkanen
authors.forename: C F
authors.initials: CF
authors.lastname: Xu
authors.forename: T
authors.initials: T
authors.lastname: Hämäläinen
authors.forename: P
authors.initials: P
authors.lastname: Talmud
authors.forename: S
authors.initials: S
authors.lastname: Sarna
authors.forename: J K
authors.initials: JK
authors.lastname: Huttunen
authors.forename: P
authors.initials: P
authors.lastname: Pietinen
authors.forename: S
authors.initials: S
authors.lastname: Humphries
mesh_terms: D000328:Adult; D000483:Alleles; D001055:Apolipoproteins B / Q000097:blood / Q000235:genetics*; D002784:Cholesterol / Q000097:blood*; D008076:Cholesterol, HDL / Q000097:blood; D008078:Cholesterol, LDL / Q000097:blood; D003327:Coronary Disease / Q000097:blood / Q000178:diet therapy* / Q000235:genetics; D005260:Female; D005387:Finland; D005838:Genotype; D006801:Humans; D008297:Male; D008875:Middle Aged; D011110:Polymorphism, Genetic / Q000235:genetics* / Q000502:physiology; D012150:Polymorphism, Restriction Fragment Length
chemical_list: D001055:Apolipoproteins B; D008076:Cholesterol, HDL; D008078:Cholesterol, LDL; D002784:Cholesterol