Detecting reliable gene interactions by a hierarchy of Bayesian network classifiers

Authors:
Rubén Armañanzas;Iñaki Inza;Pedro Larrañaga
Affiliations:
Department of Computer Science and Artificial Intelligence, University of the Basque Country, Paseo Manuel Lardizabal 1, 20018 Donostia-San Sebastián, Gipuzkoa, Spain;Department of Computer Science and Artificial Intelligence, University of the Basque Country, Paseo Manuel Lardizabal 1, 20018 Donostia-San Sebastián, Gipuzkoa, Spain;Department of Artificial Intelligence, Technical University of Madrid, 28660 Boadilla del Monte, Madrid, Spain
Venue:
Computer Methods and Programs in Biomedicine
Year:
2008

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Abstract

The main purpose of a gene interaction network is to map the relationships of the genes that are out of sight when a genomic study is tackled. DNA microarrays allow the measure of gene expression of thousands of genes at the same time. These data constitute the numeric seed for the induction of the gene networks. In this paper, we propose a new approach to build gene networks by means of Bayesian classifiers, variable selection and bootstrap resampling. The interactions induced by the Bayesian classifiers are based both on the expression levels and on the phenotype information of the supervised variable. Feature selection and bootstrap resampling add reliability and robustness to the overall process removing the false positive findings. The consensus among all the induced models produces a hierarchy of dependences and, thus, of variables. Biologists can define the depth level of the model hierarchy so the set of interactions and genes involved can vary from a sparse to a dense set. Experimental results show how these networks perform well on classification tasks. The biological validation matches previous biological findings and opens new hypothesis for future studies.