title: Transcription factor map alignment of promoter regions.
abstract: We address the problem of comparing and characterizing the promoter regions of genes with similar expression patterns. This remains a challenging problem in sequence analysis, because often the promoter regions of co-expressed genes do not show discernible sequence conservation. In our approach, thus, we have not directly compared the nucleotide sequence of promoters. Instead, we have obtained predictions of transcription factor binding sites, annotated the predicted sites with the labels of the corresponding binding factors, and aligned the resulting sequences of labels--to which we refer here as transcription factor maps (TF-maps). To obtain the global pairwise alignment of two TF-maps, we have adapted an algorithm initially developed to align restriction enzyme maps. We have optimized the parameters of the algorithm in a small, but well-curated, collection of human-mouse orthologous gene pairs. Results in this dataset, as well as in an independent much larger dataset from the CISRED database, indicate that TF-map alignments are able to uncover conserved regulatory elements, which cannot be detected by the typical sequence alignments.
authors.affiliation: Research Group in Biomedical Informatics, Institut Municipal d'Investigació Mèdica/Universitat Pompeu Fabra, Barcelona, Catalonia, Spain.
authors.forename: Enrique
authors.initials: E
authors.lastname: Blanco
authors.forename: Xavier
authors.initials: X
authors.lastname: Messeguer
authors.forename: Temple F
authors.initials: TF
authors.lastname: Smith
authors.forename: Roderic
authors.initials: R
authors.lastname: Guigó
mesh_terms: D000465:Algorithms; D000818:Animals; D002874:Chromosome Mapping; D019295:Computational Biology / Q000379:methods*; D006801:Humans; D051379:Mice; D015233:Models, Statistical; D011401:Promoter Regions, Genetic; D015183:Restriction Mapping / Q000379:methods; D012984:Software; D013045:Species Specificity; D014157:Transcription Factors / Q000235:genetics* / Q000378:metabolism*
chemical_list: D014157:Transcription Factors