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March 2008 A hidden spatial-temporal Markov random field model for network-based analysis of time course gene expression data
Zhi Wei, Hongzhe Li
Ann. Appl. Stat. 2(1): 408-429 (March 2008). DOI: 10.1214/07--AOAS145


Microarray time course (MTC) gene expression data are commonly collected to study the dynamic nature of biological processes. One important problem is to identify genes that show different expression profiles over time and pathways that are perturbed during a given biological process. While methods are available to identify the genes with differential expression levels over time, there is a lack of methods that can incorporate the pathway information in identifying the pathways being modified/activated during a biological process. In this paper we develop a hidden spatial-temporal Markov random field (hstMRF)-based method for identifying genes and subnetworks that are related to biological processes, where the dependency of the differential expression patterns of genes on the networks are modeled over time and over the network of pathways. Simulation studies indicated that the method is quite effective in identifying genes and modified subnetworks and has higher sensitivity than the commonly used procedures that do not use the pathway structure or time dependency information, with similar false discovery rates. Application to a microarray gene expression study of systemic inflammation in humans identified a core set of genes on the KEGG pathways that show clear differential expression patterns over time. In addition, the method confirmed that the TOLL-like signaling pathway plays an important role in immune response to endotoxins.


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Zhi Wei. Hongzhe Li. "A hidden spatial-temporal Markov random field model for network-based analysis of time course gene expression data." Ann. Appl. Stat. 2 (1) 408 - 429, March 2008.


Published: March 2008
First available in Project Euclid: 24 March 2008

zbMATH: 1137.62081
MathSciNet: MR2415609
Digital Object Identifier: 10.1214/07--AOAS145

Keywords: differential expression , Iterative conditional modes , pathway , undirected graph

Rights: Copyright © 2008 Institute of Mathematical Statistics


Vol.2 • No. 1 • March 2008
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