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Shin, S.-Y.* ; Petersen, A.-K. ; Wahl, S. ; Zhai, G.* ; Römisch-Margl, W. ; Small, K.S.* ; Döring, A. ; Kato, B.S.* ; Peters, A. ; Grundberg, E.* ; Prehn, C. ; Wang-Sattler, R. ; Wichmann, H.-E. ; Hrabě de Angelis, M. ; Illig, T.* ; Adamski, J. ; Deloukas, P.* ; Spector, T.D.* ; Suhre, K. ; Gieger, C. ; Soranzo, N.*

Interrogating causal pathways linking genetic variants, small molecule metabolites and circulating lipids.

Genome Med. 6:25 (2014)

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Background Emerging technologies based on mass spectrometry or nuclear magnetic resonance enable the monitoring of hundreds of small metabolites from tissues or body fluids. Profiling of metabolites can help elucidate causal pathways linking established genetic variants to known disease risk factors such as blood lipid traits. Methods We applied statistical methodology to dissect causal relationships between single nucleotide polymorphisms, metabolite concentrations and serum lipid traits, focusing on 95 genetic loci reproducibly associated with the four main serum lipids (total-, low-density lipoprotein- and high-density lipoprotein- cholesterol and triglycerides). The dataset used included 2,973 individuals from two independent population-based cohorts with data for 151 small molecule metabolites and four main serum lipids. Three statistical approaches, namely conditional analysis, Mendelian Randomization and Structural Equation Modelling, were compared to investigate causal relationship at sets of a single nucleotide polymorphism, a metabolite and a lipid trait associated with one another. Results A subset of three lipid-associated loci (FADS1, GCKR and LPA) have a statistically significant association with at least one main lipid and one metabolite concentration in our data, defining a total of 38 cross-associated sets of a single nucleotide polymorphism, a metabolite and a lipid trait. Structural Equation Modelling provided sufficient discrimination to indicate that the association of a single nucleotide polymorphism with a lipid trait was mediated through a metabolite at 15 of the 38 sets, and involving variants at the FADS1 and GCKR loci. Conclusions These data provide a framework for evaluating the causal role of components of the metabolome (or other intermediate factors) in mediating the association between established genetic variants and diseases or traits.

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