© 2001 American Heart Association, Inc.
Atherosclerosis and Lipoproteins |
Genome-Wide Linkage Analysis Reveals Evidence of Multiple Regions That Influence Variation in Plasma Lipid and Apolipoprotein Levels Associated With Risk of Coronary Heart Disease
From the Department of Human Genetics (K.L.K., C.F.S.) and the Department of Epidemiology (S.L.R.K.), University of Michigan, Ann Arbor; the Department of Human Genetics (R.E.F.), University of Pittsburgh, Pittsburgh, Pa; the Division of Hypertension, Department of Medicine, Mayo Clinic (S.T.T.), Rochester, Minn; and the Human Genetics Center, University of Texas Health Science Center (E.B.), Houston.
Correspondence to Dr Charles F. Sing, University of Michigan, Department of Human Genetics, 5928 Buhl Building, 1241 E. Catherine St, Ann Arbor, MI 48109-0618. E-mail csing{at}umich.edu
Abstract—Results of genome-wide linkage analyses to identify chromosomal regions that influence interindividual variation in plasma lipid and apolipoprotein levels in the Rochester, Minn, population are reported. Analyses were conducted for total cholesterol (total-C), triglycerides (TGs), high density lipoprotein cholesterol (HDL-C), apolipoprotein A-I, apolipoprotein A-II, apolipoprotein B, apolipoprotein C-II, apolipoprotein C-III, apolipoprotein E, the total-C/HDL-C ratio, and the TG/HDL-C ratio. Genotypes were measured for 373 genome-wide marker loci on 1484 individuals distributed among 232 multigeneration pedigrees sampled without regard to health status. LOD scores and estimates of additive genetic variance associated with map locations were obtained by using the variance-component method of linkage analysis. No evidence of linkage with genes influencing variation in age served as a negative control. Plasma apolipoprotein E levels and the apolipoprotein E gene served as a positive control (LOD score 4.20). Evidence (LOD score >2.00) was provided that was suggestive of a gene or genes on chromosomes 4 and 5 influencing variation in the apolipoprotein A-II level, on chromosome 12 influencing variation in the apolipoprotein A-I level, and on chromosome 17 influencing variation of total-C/HDL-C. These analyses provide new information about genomic regions in humans that influence interindividual variation in plasma lipid and apolipoprotein levels and serve as a basis for further fine-mapping studies to identify new genes involved in lipid metabolism.
Key Words: genetic linkage • apolipoprotein E • apolipoprotein A-I • apolipoprotein A-II • total cholesterol • high density lipoproteins
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