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DISCO-SCA and Properly Applied GSVD as Swinging Methods to Find Common and Distinctive Processes

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  • Katrijn Van Deun
  • Iven Van Mechelen
  • Lieven Thorrez
  • Martijn Schouteden
  • Bart De Moor
  • Mariët J van der Werf
  • Lieven De Lathauwer
  • Age K Smilde
  • Henk A L Kiers

Abstract

Background: In systems biology it is common to obtain for the same set of biological entities information from multiple sources. Examples include expression data for the same set of orthologous genes screened in different organisms and data on the same set of culture samples obtained with different high-throughput techniques. A major challenge is to find the important biological processes underlying the data and to disentangle therein processes common to all data sources and processes distinctive for a specific source. Recently, two promising simultaneous data integration methods have been proposed to attain this goal, namely generalized singular value decomposition (GSVD) and simultaneous component analysis with rotation to common and distinctive components (DISCO-SCA). Results: Both theoretical analyses and applications to biologically relevant data show that: (1) straightforward applications of GSVD yield unsatisfactory results, (2) DISCO-SCA performs well, (3) provided proper pre-processing and algorithmic adaptations, GSVD reaches a performance level similar to that of DISCO-SCA, and (4) DISCO-SCA is directly generalizable to more than two data sources. The biological relevance of DISCO-SCA is illustrated with two applications. First, in a setting of comparative genomics, it is shown that DISCO-SCA recovers a common theme of cell cycle progression and a yeast-specific response to pheromones. The biological annotation was obtained by applying Gene Set Enrichment Analysis in an appropriate way. Second, in an application of DISCO-SCA to metabolomics data for Escherichia coli obtained with two different chemical analysis platforms, it is illustrated that the metabolites involved in some of the biological processes underlying the data are detected by one of the two platforms only; therefore, platforms for microbial metabolomics should be tailored to the biological question. Conclusions: Both DISCO-SCA and properly applied GSVD are promising integrative methods for finding common and distinctive processes in multisource data. Open source code for both methods is provided.

Suggested Citation

  • Katrijn Van Deun & Iven Van Mechelen & Lieven Thorrez & Martijn Schouteden & Bart De Moor & Mariët J van der Werf & Lieven De Lathauwer & Age K Smilde & Henk A L Kiers, 2012. "DISCO-SCA and Properly Applied GSVD as Swinging Methods to Find Common and Distinctive Processes," PLOS ONE, Public Library of Science, vol. 7(5), pages 1-13, May.
    • Handle: RePEc:plo:pone00:0037840
    DOI: 10.1371/journal.pone.0037840
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    References listed on IDEAS

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    1. Karthik Devarajan, 2008. "Nonnegative Matrix Factorization: An Analytical and Interpretive Tool in Computational Biology," PLOS Computational Biology, Public Library of Science, vol. 4(7), pages 1-12, July.
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