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Absence of familial defective apolipoprotein B-100 in Finnish patients with elevated serum cholesterol

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      Abstract

      Familial defective apolipoprotein B-100 is a genetic disorder which is associated with elevated plasma LDL levels. It appears to result from a G → A mutation at nucleotide 10 708 in exon 26 of the apolipoprotein B-100 gene leading to a substitution of glutamine for arginine at amino acid residue 3500. We explored the possible role of this point mutation as a cause of elevated plasma cholesterol among the Finns, a genetically isolated population in which both hypercholesterolemia and coronary heart disease are common: 552 hyperlipidemic patients from Western and Southern Finland were screened either by assaying patient sera with monoclonal antibody MB47 or by amplifying the region of the apo B gene containing the nucleotide 10 708 followed by hybridization of the amplified DNA with allele-specific oligonucleotide probes. Not a single individual with this particular mutation could be found. We conclude that familial defective apo B-100 is not a common cause of elevated plasma cholesterol in this population.

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