1H-NMR metabolomics-based surrogates to impute common clinical risk factors and endpoints
Daniele Bizzarri, Marcel Reinders, Marian Beekman, P. Eline Slagboom, Bbmri-Nl, Erik B. van den Akker
Abstract
Background Missing or incomplete phenotypic information can severely deteriorate the statistical power in epidemiological studies. High-throughput quantification of small-molecules in bio-samples, i.e. ‘metabolomics', is steadily gaining popularity, as it is highly informative for various phenotypical characteristics. Here we aim to leverage metabolomics to impute missing data in clinical variables routinely assessed in large epidemiological and clinical studies. Methods To this end, we have employed ∼26,000 1 H-NMR metabolomics samples from 28 Dutch cohorts collected within the BBMRI-NL consortium, to create 19 metabolomics-based predictors for clinical variables, including diabetes status (AUC 5-Fold CV = 0·94) and lipid medication usage (AUC 5-Fold CV = 0·90). Findings Subsequent application in independent cohorts confirmed that our metabolomics-based predictors can indeed be used to impute a wide array of missing clinical variables from a single metabolomics data resource. In addition, application highlighted the potential use of our predictors to explore the effects of totally unobserved confounders in omics association studies. Finally, we show that our predictors can be used to explore risk factor profiles contributing to mortality in older participants. Interpretation To conclude, we provide 1 H-NMR metabolomics-based models to impute clinical variables routinely assessed in epidemiological studies and illustrate their merit in scenarios when phenotypic variables are partially incomplete or totally unobserved. Funding BBMRI-NL, X-omics, VOILA, Medical Delta and the Dutch Research Council (NWO-VENI).