title: Deciphering the connectivity structure of biological networks using MixNet.
abstract: BACKGROUND
  As biological networks often show complex topological features, mathematical methods are required to extract meaningful information. Clustering methods are useful in this setting, as they allow the summary of the network's topology into a small number of relevant classes. Different strategies are possible for clustering, and in this article we focus on a model-based strategy that aims at clustering nodes based on their connectivity profiles.
  
  
  RESULTS
  We present MixNet, the first publicly available computer software that analyzes biological networks using mixture models. We apply this method to various networks such as the E. coli transcriptional regulatory network, the macaque cortex network, a foodweb network and the Buchnera aphidicola metabolic network. This method is also compared with other approaches such as module identification or hierarchical clustering.
  
  
  CONCLUSIONS
  We show how MixNet can be used to extract meaningful biological information, and to give a summary of the networks topology that highlights important biological features. This approach is powerful as MixNet is adaptive to the network under study, and finds structural information without any a priori on the structure that is investigated. This makes MixNet a very powerful tool to summarize and decipher the connectivity structure of biological networks.
authors.affiliation: CNRS UMR 5558, Université Lyon-1, Laboratoire de Biométrie et Biologie Evolutive, 43 bd du 11 novembre 1918, F-69622, Villeurbanne, France. picard@biomserv.univ-lyon1.fr
authors.forename: Franck
authors.initials: F
authors.lastname: Picard
authors.forename: Vincent
authors.initials: V
authors.lastname: Miele
authors.forename: Jean-Jacques
authors.initials: JJ
authors.lastname: Daudin
authors.forename: Ludovic
authors.initials: L
authors.lastname: Cottret
authors.forename: Stéphane
authors.initials: S
authors.lastname: Robin
mesh_terms: D000465:Algorithms; D019295:Computational Biology / Q000379:methods*; D053858:Metabolic Networks and Pathways; D008954:Models, Biological; D012984:Software