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Issue No.04 - October-December (2008 vol.5)
pp: 583-593
Many different methods exist for pattern detection in gene expression data. In contrast to classical methods, biclustering has the ability to cluster a group of genes together with a group of conditions (replicates, set of patients or drug compounds). However, since the problem is NP-complex, most algorithms use heuristic search functions and therefore might converge towards local maxima. By using the results of biclustering on discrete data as a starting point for a local search function on continuous data, our algorithm avoids the problem of heuristic initialization. Similar to OPSM, our algorithm aims to detect biclusters whose rows and columns can be ordered such that row values are growing across the bicluster's columns and vice-versa. Results have been generated on the yeast genome (Saccharomyces cerevisiae), a human cancer dataset and random data. Results on the yeast genome showed that 89% of the one hundred biggest non-overlapping biclusters were enriched with Gene Ontology annotations. A comparison with OPSM and ISA demonstrated a better efficiency when using gene and condition orders. We present results on random and real datasets that show the ability of our algorithm to capture statistically significant and biologically relevant biclusters.
Bioinformatics (genome or protein) databases, Data and knowledge visualization, Data mining, Machine learning, Graph and tree search strategies
Yann Christinat, Bernd Wachmann, Lei Zhang, "Gene Expression Data Analysis Using a Novel Approach to Biclustering Combining Discrete and Continuous Data", IEEE/ACM Transactions on Computational Biology and Bioinformatics, vol.5, no. 4, pp. 583-593, October-December 2008, doi:10.1109/TCBB.2007.70251
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