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The Journal of Lipid Research, Vol. 39, 442-456, February 1998
Copyright © 1998 by Lipid Research, Inc.

Original Article

Human plasma CETP deficiency: identification of a novel mutation in exon 9 of the CETP gene in a Caucasian subject from North America

Correspondence to: Peter J. Dolphin.

Human plasma cholesteryl ester transfer protein (CETP) is a 476-residue hydrophobic glycoprotein that catalyzes the heterotransfer of cholesteryl esters and triacylglycerols among lipoproteins: Mutations in the CETP gene have been identified, mostly in the Japanese population. These mutations result in hypercholesterolemia due to the presence of large cholesteryl ester-rich HDL particles, elevated plasma apoA-I and apoE, and reduced apoB levels. Here we report the plasma lipoprotein phenotype and molecular defect in a 57-year-old female Nova Scotian subject lacking Japanese ancestry who is homozygous for a novel mutation in the CETP gene. Her total plasma cholesterol was 7.3 mmol/l with an LDL cholesterol of 2.9 mmol/l and HDL cholesterol of 4.4 mmol/l. She was mildly hypertriglyceridemic (1.6 mmol/l) and had markedly elevated apoA-I (256 mg/dl) and apoE (14.4 mg/dl) with only slightly reduced apo/B levels (94 mg/dl). Her VLDL and LDL were cholesteryl ester-poor (1.8 and 37.2% of lipids, respectively) and triacylglycerol-rich (67.3 and 18.9% of lipids, respectively) while her HDL was cholesteryl ester-rich (40.2–45.7% of lipids) and triacylglycerol-poor (3.3–2.5% of lipids). No plasma CETP activity or mass was detected. Bi-directional DNA sequence analysis of PCR products from all 16 exons showed a single base substitution (C T at nucleotide 836 in exon 9 resulting in 268 ArgSTOP) in both alleles. No other mutation was detected. A single base mismatched, 26 bp reverse PCR primer that produced a single Mae III RFLP site upon amplification of the mutated DNA sequence was designed for rapid population screening. This subject is, we believe, the first Caucasian North American patient reported to have CETP deficiency.—Teh, E. M., P. J. Dolphin, W. C. Breckenridge, and M–H. Tan. Human plasma CETP deficiency: identification of a novel mutation in exon 9 of the CETP gene in a Caucasian subject from North America. J. Lipid Res. 1998. 39: 442–456.

Supplementary key words: cholesteryl ester transfer protein, hyperalphalipoproteinemia, mutation, HDL, cholesteryl ester and phospholipid fatty acids

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