Statistical inference of the time-varying structure of gene-regulation networks
- Equal contributors
1 Center for Bioinformatics, Imperial College London, London, UK
2 Laboratoire des Sciences de l'Image de l'Informatique et de la télédétection (LSIIT), UMR UdS-CNRS 7005, Université de Strasbourg, Strasbourg, France
3 Dynamique des Structures et Interactions des Macromolécules Biologiques (DSIMB), INSERM U 665, Paris, F-75015, France
4 Université Paris Diderot - Paris 7, UMR-S665, Paris, F-75015, France
5 INTS, Paris, F-75015, France
6 Laboratoire de Génomique des Microorganismes, CNRS FRE 3214, Université Pierre et Marie Curie, Institut des Cordeliers, Paris, France
7 Institute of Mathematical Sciences, Imperial College London, London, UK
BMC Systems Biology 2010, 4:130 doi:10.1186/1752-0509-4-130Published: 22 September 2010
Biological networks are highly dynamic in response to environmental and physiological cues. This variability is in contrast to conventional analyses of biological networks, which have overwhelmingly employed static graph models which stay constant over time to describe biological systems and their underlying molecular interactions.
To overcome these limitations, we propose here a new statistical modelling framework, the ARTIVA formalism (Auto Regressive TIme VArying models), and an associated inferential procedure that allows us to learn temporally varying gene-regulation networks from biological time-course expression data. ARTIVA simultaneously infers the topology of a regulatory network and how it changes over time. It allows us to recover the chronology of regulatory associations for individual genes involved in a specific biological process (development, stress response, etc.).
We demonstrate that the ARTIVA approach generates detailed insights into the function and dynamics of complex biological systems and exploits efficiently time-course data in systems biology. In particular, two biological scenarios are analyzed: the developmental stages of Drosophila melanogaster and the response of Saccharomyces cerevisiae to benomyl poisoning.
ARTIVA does recover essential temporal dependencies in biological systems from transcriptional data, and provide a natural starting point to learn and investigate their dynamics in greater detail.