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Wahl, S. ; Vogt, S.* ; Stückler, F. ; Krumsiek, J. ; Bartel, J. ; Kacprowski, T.* ; Schramm, K. ; Carstensen, M.* ; Rathmann, W.* ; Roden, M.* ; Jourdan, C. ; Kangas, A.J.* ; Soininen, P.* ; Ala-Korpela, M.* ; Nöthlings, U.* ; Boeing, H.* ; Theis, F.J. ; Meisinger, C. ; Waldenberger, M. ; Suhre, K. ; Homuth, G.* ; Gieger, C. ; Kastenmüller, G. ; Illig, T. ; Linseisen, J. ; Peters, A. ; Prokisch, H. ; Herder, C. ; Thorand, B. ; Grallert, H.

Multi-omic signature of body weight change: Results from a population-based cohort study.

BMC Med. 13:48 (2015)

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Background Excess body weight is a major risk factor for cardiometabolic diseases. The complex molecular mechanisms of body weight change-induced metabolic perturbations are not fully understood. Specifically, in-depth molecular characterization of long-term body weight change in the general population is lacking. Here, we pursued a multi-omic approach to comprehensively study metabolic consequences of body weight change during a seven-year follow-up in a large prospective study. Methods We used data from the population-based Cooperative Health Research in the Region of Augsburg (KORA) S4/F4 cohort. At follow-up (F4), two-platform serum metabolomics and whole blood gene expression measurements were obtained for 1,631 and 689 participants, respectively. Using weighted correlation network analysis, omics data were clustered into modules of closely connected molecules, followed by the formation of a partial correlation network from the modules. Association of the omics modules with previous annual percentage weight change was then determined using linear models. In addition, we performed pathway enrichment analyses, stability analyses, and assessed the relation of the omics modules with clinical traits. Results Four metabolite and two gene expression modules were significantly and stably associated with body weight change (P-values ranging from 1.9 × 10−4 to 1.2 × 10−24). The four metabolite modules covered major branches of metabolism, with VLDL, LDL and large HDL subclasses, triglycerides, branched-chain amino acids and markers of energy metabolism among the main representative molecules. One gene expression module suggests a role of weight change in red blood cell development. The other gene expression module largely overlaps with the lipid-leukocyte (LL) module previously reported to interact with serum metabolites, for which we identify additional co-expressed genes. The omics modules were interrelated and showed cross-sectional associations with clinical traits. Moreover, weight gain and weight loss showed largely opposing associations with the omics modules. Conclusions Long-term weight change in the general population globally associates with serum metabolite concentrations. An integrated metabolomics and transcriptomics approach improved the understanding of molecular mechanisms underlying the association of weight gain with changes in lipid and amino acid metabolism, insulin sensitivity, mitochondrial function as well as blood cell development and function.

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