title: Topology of molecular interaction networks.
abstract: Molecular interactions are often represented as network models which have become the common language of many areas of biology. Graphs serve as convenient mathematical representations of network models and have themselves become objects of study. Their topology has been intensively researched over the last decade after evidence was found that they share underlying design principles with many other types of networks.Initial studies suggested that molecular interaction network topology is related to biological function and evolution. However, further whole-network analyses did not lead to a unified view on what this relation may look like, with conclusions highly dependent on the type of molecular interactions considered and the metrics used to study them. It is unclear whether global network topology drives function, as suggested by some researchers, or whether it is simply a byproduct of evolution or even an artefact of representing complex molecular interaction networks as graphs.Nevertheless, network biology has progressed significantly over the last years. We review the literature, focusing on two major developments. First, realizing that molecular interaction networks can be naturally decomposed into subsystems (such as modules and pathways), topology is increasingly studied locally rather than globally. Second, there is a move from a descriptive approach to a predictive one: rather than correlating biological network topology to generic properties such as robustness, it is used to predict specific functions or phenotypes.Taken together, this change in focus from globally descriptive to locally predictive points to new avenues of research. In particular, multi-scale approaches are developments promising to drive the study of molecular interaction networks further.
authors.affiliation: Network Architectures and Services, Department of Intelligent Systems, Faculty of Electrical Engineering, Mathematics and Computer Science, Delft University of Technology, P,O, Box 5031, 2600 GA Delft, The Netherlands. w.winterbach@tudelft.nl.
authors.forename: Wynand
authors.initials: W
authors.lastname: Winterbach
authors.forename: Piet
authors.initials: P
authors.lastname: Van Mieghem
authors.forename: Marcel
authors.initials: M
authors.lastname: Reinders
authors.forename: Huijuan
authors.initials: H
authors.lastname: Wang
authors.forename: Dick
authors.initials: D
authors.lastname: de Ridder
mesh_terms: D006801:Humans; D008660:Metabolism; D013223:Statistics as Topic; D049490:Systems Biology / Q000379:methods*
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