Journal of Lipid Research, Vol 38, 1061-1069, Copyright © 1997 by Lipid Research, Inc.

ARTICLES

A variation in the apolipoprotein C-III gene is associated with an increased number of circulating VLDL and IDL particles in familial combined hyperlipidemia

J Ribalta, AE La Ville, JC Vallve, S Humphries, PR Turner and L Masana
Unitat de Recerca de Lipids, Facultat de Medicina, Hospital Universitari de Sant Joan, Reus, Spain.

Detailed plasma lipoprotein analyses were conducted on 16 familial combined hyperlipidemic (FCHL) probands, all their available family members (n = 106) together with 12 normolipidemic control families (n = 68), and the results were assessed in relation to a C1100-T polymorphism in exon 3 of the apoC-III gene. The frequency of the T1100 genotype (CT+TT) was significantly elevated in the probands relative to control subjects (0.64 vs. 0.36; P < 0.01) and was associated with elevated concentrations of plasma triglyceride (P < 0.02) and apoC-III (P < 0.03), VLDL cholesterol (P < 0.005), VLDL triglyceride (P < 0.009), IDL cholesterol (P < 0.01). and IDL triglyceride (P < 0.007). The T1100 genotype was also associated with elevations in VLDL-apoB (P < 0.005) and IDL-apoB (P < 0.04) indicating a relationship between this variation and an increased number of triglyceride-rich particles. These findings were confined to the hyperlipidemic members of the FCHL families and showed a strong genotype-status interaction (P < 0.001). It is considerable clinical relevance that the apoC-III gene may be acting as a modifier gene that is only expressed in the presence of other factors (e.g., increased VLDL flux, low LPL activity) and therefore may predispose those members of FCHL families carrying the T1100 allele to express the FCHL phenotype.
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