Background Familial hypercholesterolemia leads to prematureischemic heart disease and is often caused by mutations in thegene for the low-density lipoprotein receptor. Mutations inthe apolipoprotein B gene, which encodes a ligand for this receptor,may also result in this phenotype.
Methods We studied the genotypes of 9255 women and men fromthe general population, 948 patients with ischemic heart disease,and 36 patients with familial hypercholesterolemia, all fromDenmark, for three mutations in the apolipoprotein B gene: Arg3500Gln,Arg3531Cys, and Arg3500Trp.
Results The prevalence of heterozygotes in the general populationwas 0.08 percent (95 percent confidence interval, 0.03 to 0.16percent) for both the Arg3500Gln and the Arg3531Cys mutations,and 0.00 percent (95 percent confidence interval, 0.00 to 0.18percent) for the Arg3500Trp mutation. Among carriers of theArg3500Gln mutation, cholesterol levels were significantly higherthan among noncarriers in the general population by100 mg per deciliter (2.6 mmol per liter) among carriers inthe general population, 154 mg per deciliter (4.0 mmol per liter)among patients with ischemic heart disease, and 172 mg per deciliter(4.5 mmol per liter) among patients with familial hypercholesterolemia.Heterozygous carriers of the Arg3500Gln mutation were significantlymore common among patients with ischemic heart disease (oddsratio, 7.0; 95 percent confidence interval, 2.2 to 22; P=0.003)and patients with familial hypercholesterolemia (odds ratio,78; 95 percent confidence interval, 16 to 388; P=0.001) thanin the general population. Heterozygous carriers of the Arg3531Cysmutation in the general population did not have higher-than-normalplasma cholesterol levels or an increased risk of ischemic heartdisease (odds ratio; 1.4; 95 percent confidence interval, 0.2to 11; P=0.54).
Conclusions The Arg3500Gln mutation in the apolipoprotein Bgene, which is responsible for familial defective apolipoproteinB-100 and is present in approximately 1 in 1000 persons in Denmark,causes severe hypercholesterolemia and increases the risk ofischemic heart disease.
Source Information
From the Department of Clinical Biochemistry, Herlev University Hospital, University of Copenhagen, Herlev (A.T.-H., B.G.N.); and the Department of Medicine B, Division of Cardiology (R.S., H.M.), and the Copenhagen City Heart Study (A.T.-H., P.S., B.G.N.), Rigshospitalet, National University Hospital, University of Copenhagen, Copenhagen both in Denmark.
Address reprint requests to Dr. Tybjærg-Hansen at the Department of Clinical Biochemistry 54M1, Herlev University Hospital, Herlev Ringvej 75, DK-2730 Herlev, Denmark.
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