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The Journal of Lipid Research, Vol. 40, 1036-1044, June 1999
Copyright © 1999 by Lipid Research, Inc.

Original Article

Association of plasma lipids and apolipoproteins with the insulin response element in the apoC-III promoter region in familial combined hyperlipidemia

Correspondence to: G. M. Dallinga-Thie

The apoAI-CIII-AIV gene cluster, located on chromosome 11, contributes to the phenotype of familial combined hyperlipidemia (FCH), but this contribution is genetically complex. Combinations of haplotypes, based on three restriction enzyme polymorphisms: XmnI and MspI sites, 5' of the start site of the apoA-I gene and SstI polymorphism in the 3' untranslated region of exon 4 of the apoC-III gene, were analyzed to characterize their effect on the expression of severe hyperlipidemia. An epistatic interaction was demonstrated: the S2 allele on one haplotype was synergistic in its hyperlipidemic effect to the X2M2 allele on the other haplotype (Dallinga-Thie, G. M. et al. J. Clin. Invest. 1997. 99: 953–961). In the present study two additional polymorphic sites in the insulin response element (IRE) of the apoC-III gene promoter, T-455C: FokI restriction site, C-482T: MspI restriction site, were studied in 34 FCH pedigrees including 34 probands, 220 hyperlipidemic relatives, 300 normolipidemic relatives, and 236 spouses. In contrast to the earlier data for the other polymorphisms in this gene cluster (XmnI, MspI/AI, and SstI), there were no differences in frequency distributions of the T-455C and the C-482T variants between probands, hyperlipidemic and normolipidemic relatives and spouses. No significant associations between plasma lipid traits and DNA variants in the IRE were observed.

Analysis of combinations of haplotypes based on the five polymorphisms in the gene cluster provided further evidence for a dominant role of the SstI polymorphism as a major susceptibility locus in FCH. The inclusion of the IRE markers did not improve genetic informativeness, nor our understanding of the observed synergistic relationship associated with the high risk combination of haplotypes in FCH families.—Groenendijk, M., R. M. Cantor, N. H. H. C. Blom, J. I. Rotter, T. W. A. de Bruin, and G. M. Dallinga-Thie. Association of plasma lipids and apolipoproteins with the insulin response element in the apoC-III promoter region in familial combined hyperlipidemia. J. Lipid Res. 1999. 40: 1036–1044.

Supplementary key words: familial combined hyperlipidemia, apolipoprotein CIII, insulin response element, gene–gene interaction

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