title: Extracting active pathways from gene expression data.
abstract: BACKGROUND
  A promising way to make sense out of gene expression profiles is to relate them to the activity of metabolic and signalling pathways. Each pathway usually involves many genes, such as enzymes, which can themselves participate in many pathways. The set of all known pathways can therefore be represented by a complex network of genes. Searching for regularities in the set of gene expression profiles with respect to the topology of this gene network is a way to automatically extract active pathways and their associated patterns of activity.
  
  
  METHODS
  We present a method to perform this task, which consists in encoding both the gene network and the set of profiles into two kernel functions, and performing a regularized form of canonical correlation analysis between the two kernels.
  
  
  RESULTS
  When applied to publicly available expression data the method is able to extract biologically relevant expression patterns, as well as pathways with related activity.
authors.affiliation: Centre de Géostatistique, Ecole des Mines de Paris, Fontainebleau cedex, France. Jean-Philippe.Vert@mines.org
authors.forename: Jean Philippe
authors.initials: JP
authors.lastname: Vert
authors.forename: Minoru
authors.initials: M
authors.lastname: Kanehisa
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D003628:Database Management Systems; D030562:Databases, Protein; D015870:Gene Expression / Q000502:physiology*; D020869:Gene Expression Profiling / Q000379:methods*; D016247:Information Storage and Retrieval / Q000379:methods*; D008954:Models, Biological; D020543:Proteome / Q000378:metabolism*; D015398:Signal Transduction / Q000502:physiology*
chemical_list: D020543:Proteome