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Proceedings of the National Academy of Sciences of the United States of America DOI:

Metagene projection for cross-platform, cross-species characterization of global transcriptional states

Publication TypeJournal Article
Year of Publication2007
AuthorsTamayo, P, Scanfeld, D, Ebert, BL, Gillette, MA, Roberts, CWM, Mesirov, JP
JournalProceedings of the National Academy of Sciences of the United States of America
Pages5959 - 64
Date Published2007/04/03/
ISBN Number0027-8424
KeywordsAnimal, Animals, Cancer, Cell Line, Cluster Analysis, Data Interpretation, Disease Models, Gene Expression Profiling, Genetic, Humans, Knockout, Leukemia, Lung Neoplasms, Mice, Models, Oligonucleotide Array Sequence Analysis, Reproducibi, Statistical, Tumor

The high dimensionality of global transcription profiles, the expression level of 20,000 genes in a much small number of samples, presents challenges that affect the sensitivity and general applicability of analysis results. In principle, it would be better to describe the data in terms of a small number of metagenes, positive linear combinations of genes, which could reduce noise while still capturing the invariant biological features of the data. Here, we describe how to accomplish such a reduction in dimension by a metagene projection methodology, which can greatly reduce the number of features used to characterize microarray data. We show, in applications to the analysis of leukemia and lung cancer data sets, how this approach can help assess and interpret similarities and differences between independent data sets, enable cross-platform and cross-species analysis, improve clustering and class prediction, and provide a computational means to detect and remove sample contamination.