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Bioinformatics Advance Access originally published online on August 25, 2009
Bioinformatics 2009 25(22):2937-2944; doi:10.1093/bioinformatics/btp511
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© The Author 2009. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Learning gene regulatory networks from gene expression measurements using non-parametric molecular kinetics

Tarmo Äijö 1 and Harri Lähdesmäki 1,2,*

1Department of Signal Processing, Tampere University of Technology, Tampere and 2Department of Information and Computer Science, Helsinki University of Technology, Helsinki, Finland

*To whom correspondence should be addressed.


  Abstract

Motivation: Regulation of gene expression is fundamental to the operation of a cell. Revealing the structure and dynamics of a gene regulatory network (GRN) is of great interest and represents a considerably challenging computational problem. The GRN estimation problem is complicated by the fact that the number of gene expression measurements is typically extremely small when compared with the dimension of the biological system. Further, because the gene regulation process is intrinsically complex, commonly used parametric models can provide too simple description of the underlying phenomena and, thus, can be unreliable. In this article, we propose a novel methodology for the inference of GRNs from time-series and steady-state gene expression measurements. The presented framework is based on the use of Bayesian analysis with ordinary differential equations (ODEs) and non-parametric Gaussian process modeling for the transcriptional-level regulation.

Results: The performance of the proposed structure inference method is evaluated using a recently published in vivo dataset. By comparing the obtained results with those of existing ODE- and Bayesian-based inference methods we demonstrate that the proposed method provides more accurate network structure learning. The predictive capabilities of the method are examined by splitting the dataset into a training set and a test set and by predicting the test set based on the training set.

Availability: A MATLAB implementation of the method will be available from http://www.cs.tut.fi/~aijo2/gp upon publication

Contact: harri.lahdesmaki{at}tut.fi

Supplementary information: Supplementary data are available at Bioinformatics online.

Associate Editor:Olga Troyanskaya

Received on April 21, 2009; revised on July 30, 2009; accepted on August 17, 2009

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