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Issue No.02 - March/April (2011 vol.8)
pp: 464-475
Itziar Irigoien , University of the Basque Country, Donostia
Sergi Vives , University of Barcelona, Barcelona
Concepción Arenas , University of Barcelona, Barcelona
Time course studies with microarray techniques and experimental replicates are very useful in biomedical research. We present, in replicate experiments, an alternative approach to select and cluster genes according to a new measure for association between genes. First, the procedure normalizes and standardizes the expression profile of each gene, and then, identifies scaling parameters that will further minimize the distance between replicates of the same gene. Then, the procedure filters out genes with a flat profile, detects differences between replicates, and separates genes without significant differences from the rest. For this last group of genes, we define a mean profile for each gene and use it to compute the distance between two genes. Next, a hierarchical clustering procedure is proposed, a statistic is computed for each cluster to determine its compactness, and the total number of classes is determined. For the rest of the genes, those with significant differences between replicates, the procedure detects where the differences between replicates lie, and assigns each gene to the best fitting previously identified profile or defines a new profile. We illustrate this new procedure using simulated data and a representative data set arising from a microarray experiment with replication, and report interesting results.
Cluster analysis, typical unit, gene profile, time course experiment, replicate.
Itziar Irigoien, Sergi Vives, Concepción Arenas, "Microarray Time Course Experiments: Finding Profiles", IEEE/ACM Transactions on Computational Biology and Bioinformatics, vol.8, no. 2, pp. 464-475, March/April 2011, doi:10.1109/TCBB.2009.79
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