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2017 ; 13
(10
): e1005580
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Incorporating networks in a probabilistic graphical model to find drivers for
complex human diseases
#MMPMID29023450
Mezlini AM
; Goldenberg A
PLoS Comput Biol
2017[Oct]; 13
(10
): e1005580
PMID29023450
show ga
Discovering genetic mechanisms driving complex diseases is a hard problem.
Existing methods often lack power to identify the set of responsible genes.
Protein-protein interaction networks have been shown to boost power when
detecting gene-disease associations. We introduce a Bayesian framework, Conflux,
to find disease associated genes from exome sequencing data using networks as a
prior. There are two main advantages to using networks within a probabilistic
graphical model. First, networks are noisy and incomplete, a substantial
impediment to gene discovery. Incorporating networks into the structure of a
probabilistic models for gene inference has less impact on the solution than
relying on the noisy network structure directly. Second, using a Bayesian
framework we can keep track of the uncertainty of each gene being associated with
the phenotype rather than returning a fixed list of genes. We first show that
using networks clearly improves gene detection compared to individual gene
testing. We then show consistently improved performance of Conflux compared to
the state-of-the-art diffusion network-based method Hotnet2 and a variety of
other network and variant aggregation methods, using randomly generated and
literature-reported gene sets. We test Hotnet2 and Conflux on several network
configurations to reveal biases and patterns of false positives and false
negatives in each case. Our experiments show that our novel Bayesian framework
Conflux incorporates many of the advantages of the current state-of-the-art
methods, while offering more flexibility and improved power in many gene-disease
association scenarios.