On the Use of Correlation and MI as a Measure of Metabolite—Metabolite Association for Network Differential Connectivity Analysis

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Metabolite differential connectivity analysis has been successful in investigating potentialmolecular mechanisms underlying different conditions in biological systems. Correlation and MutualInformation (MI) are two of the most common measures to quantify association and for buildingmetabolite—metabolite association networks and to calculate differential connectivity. In this study,we investigated the performance of correlation and MI to identify significantly differentially connected metabolites. These association measures were compared on (i) 23 publicly available metabolomic data sets and 7 data sets from other fields, (ii) simulated data with known correlation structures,and (iii) data generated using a dynamic metabolic model to simulate real-life observed metabolite concentration profiles. In all cases, we found more differentially connected metabolites when using correlation indices as a measure for association than MI.We also observed that different MI estimation algorithms resulted in difference in performance when applied to data generated using a dynamic model. We concluded that there is no significant benefit in using MI as a replacement for standard Pearson’s or Spearman’s correlation when the application is to quantify and detect differentially connected metabolites.
Original languageEnglish
Article number10040171
Number of pages26
Issue number4
Publication statusPublished - 24 Apr 2020


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