title: Clustering gene expression data using graph separators.
abstract: Recent work has used graphs to modelize expression data from microarray experiments, in view of partitioning the genes into clusters. In this paper, we introduce the use of a decomposition by clique separators. Our aim is to improve the classical clustering methods in two ways: first we want to allow an overlap between clusters, as this seems biologically sound, and second we want to be guided by the structure of the graph to define the number of clusters. We test this approach with a well-known yeast database (Saccharomyces cerevisiae). Our results are good, as the expression profiles of the clusters we find are very coherent. Moreover, we are able to organize into another graph the clusters we find, and order them in a fashion which turns out to respect the chronological order defined by the the sporulation process.
authors.affiliation: LIMOS, UMR CNRS 6158, Ensemble des Cézeaux, 63173 Aubière cedex, France. kaba@isima.fr.
authors.forename: Bangaly
authors.initials: B
authors.lastname: Kaba
authors.forename: Nicolas
authors.initials: N
authors.lastname: Pinet
authors.forename: Gaëlle
authors.initials: G
authors.lastname: Lelandais
authors.forename: Alain
authors.initials: A
authors.lastname: Sigayret
authors.forename: Anne
authors.initials: A
authors.lastname: Berry
mesh_terms: D000465:Algorithms; D016000:Cluster Analysis; D019295:Computational Biology / Q000379:methods*; D003196:Computer Graphics / Q000295:instrumentation*; D015870:Gene Expression; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods*