Supporting Regenerative Medicine by Integrative Dimensionality Reduction

F. Mulas, L. Zagar, B. Zupan, R. Bellazzi

Research output: Contribution to journalArticlepeer-review

Abstract

Objective: The assessment of the developmental potential of stem cells is a crucial step towards their clinical application in regenerative medicine. It has been demonstrated that genome-wide expression profiles can predict the cellular differentiation stage by means of dimensionality reduction methods. Here we show that these techniques can be further strengthened to support decision making with i) a novel strategy for gene selection; ii) methods for combining the evidence from multiple data sets. Methods: We propose to exploit dimensionality reduction methods for the selection of genes specifically activated in different stages of differentiation. To obtain an integrated predictive model, the expression val - ues of the selected genes from multiple data sets are combined. We investigated distinct approaches that either aggregate data sets or use learning ensembles. Results: We analyzed the performance of the proposed methods on six publicly available data sets. The selection procedure identified a reduced subset of genes whose expression values gave rise to an accurate stage prediction. The assessment of predictive accuracy demonstrated a high quality of predictions for most of the data integration methods pre - sented. Conclusion: The experimental results highlighted the main potentials of proposed approaches. These include the ability to predict the true staging by combining multiple training data sets when this could not be inferred from a single data source, and to focus the analysis on a reduced list of genes of similar predictive performance.

Original languageEnglish
Pages (from-to)341-347
Number of pages7
JournalMethods of Information in Medicine
Volume51
Issue number4
DOIs
Publication statusPublished - 2012

Keywords

  • Gene subset selection
  • Predictive modelling
  • Principal component analysis
  • Regenerative medicine
  • Stem cells

ASJC Scopus subject areas

  • Health Informatics
  • Health Information Management
  • Advanced and Specialised Nursing

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