Dyslipidemia is strongly associated with raised plasma glucose levels and insulin resistance, and genome-wide association studies have identified 95 loci that explain a substantial proportion of the variance in blood lipids. However, the loci’s effects on glucose-related traits are largely unknown. We have studied these lipid loci and tested their association collectively and individually with fasting plasma glucose (FPG), glycated hemoglobin (HbA1c), and insulin resistance in two independent cohorts: 10,995 subjects from LifeLines and 2,438 subjects from PREVEND. In contrast to the positive relationship between dyslipidemia and glucose traits, the genetic predisposition to dyslipidemia showed a pleiotropic lowering effect on glucose traits. Specifically, the genetic risk score related to higher triglyceride level was correlated with lower levels of FPG (P=9.6x10-10 and P=0.03 in Lifelines and PREVEND, respectively), HbA1c (P=4.2x10-7 in LifeLines) and HOMA-IR (P=6.2x10-4 in PREVEND), after adjusting for blood lipid levels. At the single SNP level, 15 lipid loci showed a pleiotropic association with glucose traits (P<0.01), of which eight (CETP, MLXIPL, PLTP, GCKR, APOB, APOE-C1-C2, CYP7A1 and TIMD4) had opposite allelic directions of effect on dyslipidemia and glucose levels. Our findings suggest a complex genetic regulation and metabolic interplay between lipids and glucose.
‡ These authors contributed equally
- © 2014 by the American Diabetes Association.
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