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Both hepatic lipase (HL) and apolipoprotein C-III (apoC-III) influence lipid metabolism. Common variation in promoters of both genes, LIPC -514C > T and APOC3 -482C > T, respectively, have been shown Show more
Both hepatic lipase (HL) and apolipoprotein C-III (apoC-III) influence lipid metabolism. Common variation in promoters of both genes, LIPC -514C > T and APOC3 -482C > T, respectively, have been shown to affect plasma lipids and lipoproteins and glucose tolerance. We studied the interaction between both variants on parameters of glucose tolerance and lipid metabolism in 714 healthy young males participating in the second European Atherosclerosis Research Study (EARS-II). Approximately 18% of the subjects were carriers of at least one rare LIPC and APOC3 allele. These subjects exhibited, after fasting and oral fat loading, the highest values of triglyceride-rich lipoproteins, but there was no significant interactive effect on any lipid variable. However, interaction occurred on basal diastolic blood pressure (p =0.036) and, during oral glucose tolerance testing, on peak (p = 0.0065) and area under the curve for glucose (p =0.049), and insulin (p = 0.035). This resulted in the highest diastolic blood pressure and lowest glucose tolerance in carriers of at least one rare allele of both genes. Thus gene:gene interaction between LIPC and APOC3, even in these healthy young males, leads to changes in parameters that are typically characteristic of Syndrome-X. Show less