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Journal of Lipid Research, Vol 30, 1349-1355, Copyright © 1989 by Lipid Research, Inc.
ARTICLES |
B Sepehrnia, MI Kamboh, LL Adams-Campbell, CH Bunker, M Nwankwo, PP Majumder and RE Ferrell
Human Genetics Division, University of Pittsburgh, PA 15261.
The human apolipoprotein C-II locus exhibits genetically determined structural polymorphism in United States and African blacks. In the present study, we have investigated the effect of the apoC-II polymorphism on quantitative serum levels of total cholesterol, total high density lipoprotein (HDL) cholesterol, cholesterol in high density lipoprotein subfractions, low density lipoprotein (LDL) cholesterol, and triglycerides (TG) in a sample of 368 unrelated Nigerian blacks. The frequencies of the APOC-II*1 and APOC-II*2 alleles in the samples were 0.947 and 0.053, respectively. In males, the effect of the APOC- II*2 allele was to lower the total serum cholesterol and LDL- cholesterol levels by 13.28 mg/dl and 10.55 mg/dl, respectively, relative to the common allele, APOC-II*1. In females, the effect was to lower total plasma cholesterol by 4.49 mg/dl and LDL-cholesterol by 3.21 mg/dl. The effect of apoC-II on quantitative lipoprotein levels is shown to be independent of variation at the linked apoE locus, but the products of the two loci interact in determining overall quantitative phenotypes.
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