Using SuSPect to Predict the Phenotypic Effects of Missense Variants. Chris Yates UCL Cancer Institute
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1 Using SuSPect to Predict the Phenotypic Effects of Missense Variants Chris Yates UCL Cancer Institute
2 Outline SAVs and Disease Development of SuSPect Features included Feature selection Performance Web-Server & Availability Usage Example results
3 Outline SAVs and Disease Development of SuSPect Features included Feature selection Performance Web-Server & Availability Usage Example results
4 Background 10-15,000 single amino acid variants (SAVs) per exome. Many variants are tolerated, but some SAVs cause disease. Glu6Val in HBB causes sickle cell anæmia. Many mechanisms by which SAVs can impair function. Decrease stability, Change active site, Protein-protein interaction. Need methods for predicting SAV effects Sequence- and structure-based.
5 Hexokinase
6 Transthyretin
7 Transthyretin
8 Outline SAVs and Disease Development of SuSPect Features included Feature selection Performance Web-Server & Availability Usage Example results
9 Features Sequence conservation Position-specific scoring matrix (PSI-BLAST) Pfam domain Jensen-Shannon divergence Secondary structure Structural features From PDB or Phyre2 homology models where available. Secondary structure Solvent accessibility Intrinsic disorder Solvent accessibility Conserva on Domain Network features Protein-protein interaction (PPI) Domain-domain interaction (DDI) Domain bigram
10 Features Sequence conservation Position-specific scoring matrix (PSI-BLAST) Pfam domain Jensen-Shannon divergence Secondary structure Structural features From PDB or Phyre2 homology models where available. Secondary structure Solvent accessibility Intrinsic disorder Solvent accessibility Conserva on Domain Network features Protein-protein interaction (PPI) Domain-domain interaction (DDI) Domain bigram
11 Features Sequence conservation Position-specific scoring matrix (PSI-BLAST) Pfam domain Jensen-Shannon divergence Secondary structure Structural features From PDB or Phyre2 homology models where available. Secondary structure Solvent accessibility Intrinsic disorder Solvent accessibility Conserva on Domain Network features Protein-protein interaction (PPI) Domain-domain interaction (DDI)
12 Network Features Change in protein function is not the same as causing disease. More important proteins are more likely to be involved in disease. Centrality of a protein within a protein-protein interaction network can be used to measure importance.
13 VariBench Neutral and Pathogenic datasets obtained from VariBench (Thusberg et al. 2011). Neutral SAVs from dbsnp version 131, filtered by allele frequency (>0.01) and chromosome count (>49). SAVs present in OMIM removed. Pathogenic SAVs from PhenCode (2009). VariBench datasets were filtered to remove any SAVs present in training data. 13,236 Neutral 5,397 Pathogenic
14 VariBench Method AUC Balanced Accuracy SuSPect MutPred MutationAssessor SIFT FATHMM Condel PANTHER PolyPhen
15 Results Take home messages Feature selection improves performance Top 9 features selected. Predicted relative solvent accessibility; WT and Variant scores in PSSM, and their difference; Number of UniProt annotations; Difference in Pfam scores; PPI network degree centrality; Jensen-Shannon divergence; Sequence identity with best-matching sequence to lack WT amino acid. Network features are important Removal of network features drops AUC from 0.88 to Removal of PPI centrality from SuSPect-FS gives drop from 0.90 to Network centrality helps show the difference between variants affecting protein function and leading to disease.
16 Sensitivity Results Feature Selection SuSPect SuSPect FS Specificity
17 Results Take home messages Feature selection improves performance Top 9 features selected. Predicted relative solvent accessibility; WT and Variant scores in PSSM, and their difference; Number of UniProt annotations; Difference in Pfam scores; PPI network degree centrality; Jensen-Shannon divergence; Sequence identity with best-matching sequence to lack WT amino acid Network features are important Removal of network features drops AUC from 0.88 to Removal of PPI centrality from SuSPect-FS gives drop from 0.90 to Network centrality helps show the difference between variants affecting protein function and leading to disease.
18 Sensitivity Results No Network Features SuSPect SuSPect No Net Specificity
19 Results Take home messages Feature selection improves performance Top 9 features selected. Predicted relative solvent accessibility; WT and Variant scores in PSSM, and their difference; Number of UniProt annotations; Difference in Pfam scores; PPI network degree centrality; Jensen-Shannon divergence; Sequence identity with best-matching sequence to lack WT amino acid Network features are important Removal of network features drops AUC from 0.88 to Removal of PPI centrality from SuSPect-FS gives drop from 0.90 to Network centrality helps show the difference between variants affecting protein function and leading to disease.
20 Results - Prokaryotic Mutations HIV-1 protease Loeb et al. (1989) 225 deleterious 111 neutral LacI repressor Suckow et al. (1996) 1,774 deleterious 2,267 neutral T4 lysozyme Rennel et al. (1991) 638 deleterious 1,377 neutral
21 Results - Prokaryotic Mutations HIV-1 Protease E. coli LacI repressor T4 Lysozyme
22 Outline SAVs and Disease Development of SuSPect Features included Feature selection Performance Web-Server & Availability Usage Example results
23 Web-Server & Download Available at Upload list of SAVs or VCF file to obtain scores for human missense variants In addition to score, gives easily interpretable descriptions. Sequence conservation, structure, active site, and much more. Useful for interpretation of how variants can have their effects. SuSPect Package downloadable database of precalculated scores for all possible human missense variants.
24 Web-Server & Download
25 Web-Server & Download Human Proteins Scores have been pre-calculated for the Mar-2013 release of UniProt. If human variants or proteins are uploaded (either as sequence, structure or ID), these pre-calculated scores are used. These scores are calculated using SuSPect-FS, which is quicker and shows better performance than the full version. Other Organisms For non-human proteins, scores are calculated on-the-fly, using a version of SuSPect including all features except the PPI network information and UniProt annotations.
26 SuSPectP Disease-specific scores associating SAVs with disease
27 SuSPectP
28 SuSPectP
29 SuSPectP
30 Acknowledgements & References Prof. Michael Sternberg Dr Ioannis Filippis Dr Lawrence Kelley Dr Suhail Islam Yates CM & Sternberg MJE (2013) Proteins and domains vary in their tolerance of nonsynonymous single nucleotide polymorphisms. J. Mol. Biol., 425: Yates CM et al. (2014) SuSPect: enhanced prediction of single amino acid variant (SAV) phenotype using network features. J. Mol. Biol., 426:
31 Cross-Validation Precision Recall MCC Balanced Accuracy SAV Protein Feature Selection Precision = TP TP + FP Recall = TP TP + FN BA = 0.5 TP TP + FN TN TN + FP MCC = TP TN - FP FN (TP + FP)(TP + FN)(TN + FP)(TN + FN)
32 Sensitivity Results No Structural Features SuSPect SuSPect No Structure Specificity
33 Sensitivity Results No Network Features SuSPect FS SuSPect FS No Net Specificity
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