J. Lipid Res.
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Journal of Lipid Research, Vol 35, 1505-1508, Copyright © 1994 by Lipid Research, Inc.

ARTICLES

Time-resolved fluorometry in the genetic diagnosis of familial defective apolipoprotein B-100

G Eggertsen, M Eriksson, O Wiklund, A Iitia, SO Olofsson, B Angelin and L Berglund
Department of Clinical Chemistry, Karolinska Institute at Huddinge University Hospital, Sweden.

A novel technique for screening point mutations has been developed for diagnosis of familial defective apolipoprotein (apo) B-100 (FDB). In FDB, an amino acid exchange occurs at position 3500 in apoB-100 due to a point mutation. Polymerase chain reaction (PCR) was performed on the appropriate region of the apoB gene, and the PCR products were hybridized in solution with europium-labeled oligonucleotides, complementary to either the wildtype or the mutant genome. The presence or absence of the apoB-3500 mutation was monitored by time-resolved fluorescence of the europium chelate. The method allows a larger number of samples to be processed simultaneously, and the detection system displays a high level of sensitivity without the hazards connected to the use of radioactivity. When 127 Swedish patients, clinically diagnosed as suffering from heterozygous familial hypercholesterolemia, were screened for the presence of the apoB-3500 mutation, two patients, unrelated to each other, were found to be heterozygotes. These patients are the first reported cases of FDB from Sweden, and the frequency rate observed among hypercholesterolemic patients, 1.6%, is in accordance with the figures reported for several other patient population in Europe and the United States.
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