Exploiting ontology graph for predicting sparsely annotated gene function.
Bottom Line: Systematically predicting gene (or protein) function based on molecular interaction networks has become an important tool in refining and enhancing the existing annotation catalogs, such as the Gene Ontology (GO) database.Our method is scalable to datasets with a large number of annotations.In a cross-validation experiment in yeast, mouse and human, our method greatly outperformed previous state-of-the-art function prediction algorithms in predicting sparsely annotated functions, without sacrificing the performance on labels with sufficient information.
Affiliation: Department of Computer Science, University of Illinois at Urbana-Champaign, Urbana, IL, Computer Science and Artificial Intelligence Laboratory, MIT, Cambridge, MA and Department of Mathematics, MIT, Cambridge, MA, USA.Show MeSH
Related in: MedlinePlus
Mentions: To evaluate clusDCA, we performed large-scale function prediction for human, yeast and mouse. The results are summarized in Figure 3 and Supplementary Figure S2 (Supplementary Data). It is clear that our approach significantly outperforms other methods on sparsely annotated labels in all three datasets. For example, in human, our method achieved 0.8491 micro-AUROC and 0.8648 macro-AUROC on BP labels with 3–10 annotations, which is much higher than 0.5815 (micro), 0.5857 (macro) for DCA and 0.7288 (micro), 0.8002 (macro) for GeneMANIA. It is worth noting that DCA performs consistently worse than GeneMANIA at this task, possibly due to the fact that GeneMANIA adaptively integrates the input networks for each functional label to optimize performance on training data. In yeast, clusDCA achieved 0.9025 micro-AUROC on BP labels with 3–10 annotations, which is again substantially higher than 0.6645 for DCA and 0.8504 for GeneMANIA. In mouse, clusDCA achieved 0.8627 micro-AUROC and 0.8802 macro-AUROC on BP labels with 3–10 annotations, which is again substantially higher than 0.5873 (micro), 0.5937 (macro) for DCA and 0.7609 (micro), 0.8245 (macro) for GeneMANIA. A similar improvement was observed for functional labels with 11–30 annotations and also for the MF labels in human, yeast and mouse (Fig. 3 and Supplementary Fig. S2). We found most of the improvements to be statistically significant (P < 0.05; paired Wilcoxon signed-rank test). The improvement was most pronounced in human overall, presumably because the human dataset is much sparser than the other two.Fig. 3.
Affiliation: Department of Computer Science, University of Illinois at Urbana-Champaign, Urbana, IL, Computer Science and Artificial Intelligence Laboratory, MIT, Cambridge, MA and Department of Mathematics, MIT, Cambridge, MA, USA.