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The APOLIPOPROTEIN (APO)A1/C3/A4/A5 gene cluster on chromosome 11 has been hypothesized to be a modifier of plasma triglycerides in FCH. In the present study, we extended previous association analyses of the gene cluster to include APOA5, a newly discovered member of the cluster. Eight SNPs across the APOA1/C3/A4/A5 gene region were analyzed in 78 FCH probands and their normolipidemic spouses as well as in 27 Dutch FCH families. Of the individual SNPs tested in the case-control panel, the strongest evidence of association was obtained with SNPs in APOA1 (P=0.001) and APOA5 (P=0.001). A single haplotype defined by a missense mutation in APOA5 was enriched 3-fold in FCH probands when compared with the normolipidemic spouses (P=0.001) and a second haplotype was significantly enriched in the spouses (P=0.001). Family-based tests also indicated significant association of triglyceride levels and LDL particle size with the investigated SNPs of APOC3 and APOA5. These findings suggest that genetic variation in the APOA1/C3/A4/A5 gene cluster acts as a modifier of plasma triglyceride levels and LDL particle size within FCH families and furthermore indicate that a number of haplotypes may contribute to FCH.

Association of theAPOLIPOPROTEIN A1/C3/A4/A5Gene Cluster With Triglyceride Levels and LDL Particle Size in Familial Combined Hyperlipidemia