Genetic factors that contribute to interindividual variations in plasma low density lipoprotein-cholesterol levels

Jonathan Cohen, Allan Gaw, Robert I. Barnes, Katherine T. Landschulz, Helen H. Hobbs

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Abstract

The interplay of multiple genes and environmental factors generates interindividual variation in plasma low density lipoprotein-cholesterol (LDL-C) concentrations. As a result, it has been difficult to identify individual genes that contribute to variation in plasma LDL-C levels using classical linkage analysis. We have exploited a genetic defect in the gene encoding the LDL receptor that is associated with a dramatically elevated plasma LDL-C level to unmask an allele at another locus that lowers plasma LDL-C levels. The existence of such an allele was implied by the analysis of a human pedigree with familial hypercholesterolaemia in which a third of the familial hypercholesterolaemia heterozygotes had normal levels of LDL-C. To develop an animal model of this LDL-C lowering effect and to identify genes that modify the plasma LDL-C level, we crossed LDL receptor-deficient mice with other strains of mice.

Original languageEnglish (US)
Pages (from-to)194-210
Number of pages17
JournalCIBA Foundation Symposia
Issue number197
StatePublished - Dec 1 1996

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