title: Polygenic determinants of severe hypertriglyceridemia.
abstract: Recent genome-wide association (GWA) studies have identified new genetic determinants of complex quantitative traits, including plasma triglyceride (TG). We hypothesized that common variants associated with mild TG variation identified in GWA studies would also be associated with severe hypertriglyceridemia (HTG). We studied 132 patients of European ancestry with severe HTG (fasting plasma TG > 10 mmol/l), who had no mutations found by resequencing of candidate genes, and 351 matched normolipidemic controls. We determined genotypes for: GALNT2 rs4846914, TBL2/MLXIPL rs17145738, TRIB1 rs17321515, ANGPTL3 rs12130333, GCKR rs780094, APOA5 rs3135506 (S19W), APOA5 rs662799 (-1131T > C), APOE (isoforms) and LPL rs328 (S447X). We found that: (i) genotypes, including those of APOA5 S19W, APOA5 -1131T > C, APOE, GCKR, TRIB1 and TBL2/MLXIPL, were significantly associated with severe HTG; (ii) odds ratios for these genetic variables were significant in both univariate and multivariate regression analyses, irrespective of the presence or absence of diabetes or obesity; (iii) a significant fraction-about one-quarter-of the explained variation in disease status was associated with these genotypes. Therefore, common SNPs (single nucleotide polymorphisms) that are associated with mild TG variation in GWA studies of normolipidemic subjects are also associated with severe HTG. Our findings are consistent with the emerging model of a complex genetic trait. At the extremes of a quantitative trait, such as severe HTG, are found the cumulative contributions of both multiple rare alleles with large genetic effects and common alleles with small effects.
authors.affiliation: Vascular Biology Research Group 2 Clinical Trials Group, Robarts Research Institute and Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada.
authors.forename: Jian
authors.initials: J
authors.lastname: Wang
authors.forename: Matthew R
authors.initials: MR
authors.lastname: Ban
authors.forename: Guang Yong
authors.initials: GY
authors.lastname: Zou
authors.forename: Henian
authors.initials: H
authors.lastname: Cao
authors.forename: Tim
authors.initials: T
authors.lastname: Lin
authors.forename: Brooke A
authors.initials: BA
authors.lastname: Kennedy
authors.forename: Sonia
authors.initials: S
authors.lastname: Anand
authors.forename: Salim
authors.initials: S
authors.lastname: Yusuf
authors.forename: Murray W
authors.initials: MW
authors.lastname: Huff
authors.forename: Rebecca L
authors.initials: RL
authors.lastname: Pollex
authors.forename: Robert A
authors.initials: RA
authors.lastname: Hegele
mesh_terms: D048868:Adaptor Proteins, Signal Transducing / Q000235:genetics; D000328:Adult; D001053:Apolipoproteins / Q000235:genetics; D016022:Case-Control Studies; D005260:Female; D019204:GTP-Binding Proteins / Q000235:genetics; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D015228:Hypertriglyceridemia / Q000235:genetics*; D047908:Intracellular Signaling Peptides and Proteins / Q000235:genetics; D008297:Male; D008875:Middle Aged; D020412:Multifactorial Inheritance; D015999:Multivariate Analysis; D017350:N-Acetylgalactosaminyltransferases / Q000235:genetics; D017346:Protein Serine-Threonine Kinases / Q000235:genetics / Q000037:antagonists & inhibitors; D014280:Triglycerides / Q000097:blood; D044465:White People / Q000235:genetics; D000097763:Polypeptide N-acetylgalactosaminyltransferase
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D001053:Apolipoproteins; D019204:GTP-Binding Proteins; D047908:Intracellular Signaling Peptides and Proteins; D017350:N-Acetylgalactosaminyltransferases; D017346:Protein Serine-Threonine Kinases; D014280:Triglycerides; D000097763:Polypeptide N-acetylgalactosaminyltransferase; C485100:GCKR protein, human; C402405:TBL2 protein, human; C493170:TRIB1 protein, human