Elsevier

Atherosclerosis

Volume 97, Issues 2–3, December 1992, Pages 171-185
Atherosclerosis

Research paper
Associations between lipoprotein lipase gene polymorphisms and plasma correlations of lipids, lipoproteins and lipase activities in young myocardial infarction survivors and age-matched healthy individuals from Sweden

https://doi.org/10.1016/0021-9150(92)90130-9Get rights and content

Abstract

Association studies were carried out on a sample of 87 patients from Sweden who had survived a myocardial infarction (MI) at a young age and 93 age-matched healthy individuals, to compare the impact of polymorphisms (PvuII, HindIII and Serine447-Stop) at the lipoprotein lipase (LPL) gene locus on among-individual differences in plasma lipid traits and progression of atherosclerosis. Significant linkage dis-equilibrium was detected between any two of these polymorphisms, with the Stop447 allele being only found on the same chromosome as the rare alleles (no cutting sites) of the PvuII and HindIII polymorphisms. In the healthy individuals, weak associations were found between genotypes of the HindIII polymorphism and triglycerides and the PvuII polymorphism and high density lipoprotein cholesterol explaining 7.4% and 5.6% of sample variance (P = 0.03 and 0.09), respectively. No associations were found between these traits and genotypes of the Serine447-Stop substitution, and thus it is unlikely to be the cause of the associations seen with the Pvull and HindIII polymorphisms even though it truncates the enzyme amino acid sequence. The presence of the rare allele, H, of the HindIII polymorphism was associated with a smaller variance in triglycerides and both cholesterol and triglycerides in the very low density lipoprotein fraction, and with larger interdependent variation between these lipid traits, and also between LPL activity and these lipid traits. This implies that the H allele, rather than the Stop447 allele, hasthe major impact on interdependence between traits which are directly orindirectly influenced by LPL activity. In the healthy individuals who were carriers of the apolipoprotein E2 allele, the inter-dependence between LPL activity and lipid traits was significantly smaller, and that between high density lipoprotein cholesterol and both cholesterol and triglycerides in the very low density lipoprotein fraction was much larger compared with non-carriers (P < 0.05). No significant associations were found between lipid traits or lipase activity and genotypes of the Serine447-Stop substitution. However, in the patients, global severity of coronary atherosclerosis at the first angiography was significantly associated with haplotype combinations of the HindIII and the Serine447-Stop polymorphisms, with the HStop haplotype being associated with the highest median score (P = 0.02). The data suggest that variation at the LPL gene locus is assoicated with a pleiotropic effect, that is not directly mediated by changes in lipids, on severity of coronary atherosclerosis.

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