ApoE and ApoC-I polymorphisms: association of genotype with cardiovascular disease phenotype in African Americans |
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Authors: | Erdembileg Anuurad Masayuki Yamasaki Neil Shachter Thomas A. Pearson Lars Berglund |
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Affiliation: | *Department of Medicine, University of California, Davis, CA;†Department of Environmental and Preventive Medicine, Shimane University School of Medicine, Shimane, Japan;§Department of Medicine, Columbia University, New York, NY;**Department of Family and Community Medicine, University of Rochester, Rochester, NY;††Veterans Affairs (VA) Northern California Health Care System, Mather, CA |
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Abstract: | Apolipoproteins (apo) E and C-I are components of triglyceride (TG)-rich lipoproteins and impact their metabolism. Functional polymorphisms have been established in apoE but not in apoC-I. We studied the relationship between apoE and apoC-I gene polymorphisms and plasma lipoproteins and coronary artery disease (CAD) in 211 African Americans and 306 Caucasians. In African Americans but not in Caucasians, apoC-I H2-carriers had significantly lower total and LDL cholesterol and apoB levels, and higher glucose, insulin, and HOMA-IR levels compared with H1 homozygotes. Differences across CAD phenotypes were seen for the apoC-I polymorphism. African-American H2-carriers without CAD had significantly lower total cholesterol (P < 0.001), LDL cholesterol (P < 0.001), and apoB (P < 0.001) levels compared with H1 homozygotes, whereas no differences were found across apoC-I genotypes for African Americans with CAD. Among African-American apoC-I H1 homozygotes, subjects with CAD had a profile similar to the metabolic syndrome (i.e., higher triglyceride, glucose, and insulin) compared with subjects without CAD. For African-American H2-carriers, subjects with CAD had a pro-atherogenic lipid pattern (i.e., higher LDL cholesterol and apoB levels), compared with subjects without CAD. ApoC-I genotypes showed an ethnically distinct phenotype relationship with regard to CAD and CAD risk factors. |
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Keywords: | apolipoprotein C-I apolipoprotein E coronary artery disease ethnicity polymorphism |
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