The quantitative level of apolipoprotein (apo) B associated with low-density lipoprotein (LDL) varies among individuals within the population. This variation in level of the LDL receptor ligand appears to have predictive value, and may have an etiologic role, in coronary artery disease. Complex segregation analysis was used to compare eight different models of transmission. This study confirms the existence of allelic variations at a single genetic locus with large effects on the interindividual variation in the level of the serum apo B associated with LDL. This is the first study to consider the possible effects of inherited polymorphic variation in the apo E molecule when analyzing the components of variation in apo B associated with LDL. Our analyses suggest that the common alleles coding for the apo E polymorphism act independently of the unmeasured single-gene locus characterized by this study.
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