Inference of patient-specific pathway activities from multi-dimensional cancer genomics data using PARADIGM. Bioinformatics, 2010
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1 Inference of patient-specific pathway activities from multi-dimensional cancer genomics data using PARADIGM. Bioinformatics, 2010 C.J.Vaske et al. May 22, 2013 Presented by: Rami Eitan
2 Complex Genomic Rearrangements Cancer tissue experience molecular changes Varied genomic data available copy number variations mutations, gene expression Stratification of cancers can improve: diagnosis prognosis risk assessment response to treatment
3 Complex Genomic Rearrangements Genetic alterations differ between patients Pathways often are common
4 Pathways What is a pathway? Figure : The P53 pathway
5 Pathways A set of interactions between entities, logically grouped together around a biological process. Protein-coding genes, small molecules, complexes, gene families, abstract processes Available databases: Reactome, KEGG, NCI
6 Motivation Integra+ve analysis of cancer genome data Copy number varia+ons, gene expressions Leverage pathway informa+on to find frequently occurring pathway perturba+ons NCI pathway interac+on database, KEGG etc.
7 Observed Data Figure : Gene expression Figure : Copy number
8 Motivation Pathway informa+on contains informa+on on how genes are supposed to behave
9 Input Infer integrated pathway activity (IPA) Produce a matrix A. A ij is the inferred activity of entity i in patient j
10 PARADIGM
11 Factor graph Factor graph is a probabilistic graphical model. Variables, factors. Figure : A simple factor graph
12 PARADIGM Model Factor graph representa+on of various en++es corresponding to a single gene
13 PARADIGM Model: Gene Interactions
14 A factor graph for a pathway PARADIGM Model:
15 Model Specification Convert an NCI pathway into a factor graph NCI pathway to Bayesian network Directed network Each variable takes values of - 1 (de- ac+va+on), 0 (normal), 1 (ac+va+on) mrna: over expression for ac+va+on Copy number varia+ons: more than two copies for ac+va+ons Probability distribu+on of each node Labeled edges for posi+ve/nega+ve interac+ons Set the value of the child node as weighted votes from its parents
16 Model Specification Conver+ng the Bayesian network to a factor graph Assign a factor to each group of variables consis+ng of a node and its parents Z: normaliza+on constant ε = 0.001
17 Inference Observed variables: copy number variations, gene expressions Unobserved variables: protein, protein activity, overall pathway activity state Learn models with EM algorithm E step: Infer the probabilities of the unobserved variables M step: Change parameters to to maximize the likelihood given the probabilities
18 Expectation Maximization Figure : EM algorithm
19 Log-likelihood Ratio Test Test sta+s+c for assessing en+ty i s ac+vity given data D The probabili+es can be obtained by performing inference on the factor graph
20 Significance assessment Permutate the labels of the observed data Within permutation: choosing random genes from the same pathway Any permutation: choosing any random genes 1000 permutations of each type are used to determine null distribution
21 Decoy paths Create decoy paths by replacing genes with random genes Maintain the same structure All complexes and abstract processes remain the same
22 Log-likelihood Ratio Test Aggrega+ng over mul+ple values en+ty i takes
23 Dataset Breast cancer copy number and gene expression data TCGA Glioblastoma copy number and gene expression data Pathways from NCI pathway interac+on database (PID)
24 Results - breast cancer Breast Cancer dataset: IPA s (7%) found to be significantly higher 497 significant entities per patient on average 103 out of 127 pathways had at least one entity altered in 20% or more of the patients
25 Results - GBM GBM dataset: IPA s (9%) found to be significantly higher 616 significant entities per patient on average 110 out of 127 pathways had at least one entity altered in 20% or more of the patients
26 EM Convergence Original data vs. permuted data Red: real data Green: permuted data
27 Results - decoy paths Distinguishing decoy from real pathways Figure : PARADIGM vs SPIA: FP rate
28 Results - decoy paths Distinguishing decoy from real pathways Breast cancer AUC: PARADIGM: SPIA: GBM AUC: PARADIGM: SPIA: 0.604
29 Top PARADIGM Pathways of Breast Cancer
30 Top PARADIGM Pathways of Glioblastoma
31 Glioblastoma Subtypes
32 Survival Rates for Each Subtypes
33 Results - Patient vs permutation Figure : Patient vs permuted IPA s
34 Results - Patient vs permutation Figure : Patient vs permuted IPA s. Source: Broad Institute/Dana-Farber Cancer Institute/Harvard Medical School
35 Summary PARADIGM integrates different types of data, including gene- expression, copy number varia+on, and pathway database, in order to infer pathway ac+vi+es for individual cancer pa+ents. Factor graph model for represen+ng pathway and modeling datasets Pathway ac+vi+es inferred by PARADIGM can be used to iden+fy cancer subtypes
36 Questions
37 Discussion Can the method be successfully expanded to more observed data? Instead of using the pathways as is, can this method be used to find new pathways and interactions?
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