Extracting a few functionally reproducible biomarkers to build robust subnetwork-based classifiers for the diagnosis of cancer

Lin Zhang, Shan Li, Chunxiang Hao, Guini Hong, Jinfeng Zou, Yuannv Zhang, Pengfei Li, Zheng Guo

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

In microarray-based case-control studies of a disease, people often attempt to identify a few diagnostic or prognostic markers amongst the most significant differentially expressed (DE) genes. However, the reproducibility of DE genes identified in different studies for a disease is typically very low. To tackle the problem, we could evaluate the reproducibility of DE genes across studies and define robust markers for disease diagnosis using disease-associated protein-protein interaction (PPI) subnetwork. Using datasets for four cancer types, we found that the most significant DE genes in cancer exhibit consistent up- or down-regulation in different datasets. For each cancer type, the 5 (or 10) most significant DE genes separately extracted from different datasets tend to be significantly coexpressed and closely connected in the PPI subnetwork, thereby indicating that they are highly reproducible at the PPI level. Consequently, we were able to build robust subnetwork-based classifiers for cancer diagnosis.

Original languageEnglish (US)
Pages (from-to)232-238
Number of pages7
JournalGene
Volume526
Issue number2
DOIs
StatePublished - Sep 10 2013
Externally publishedYes

Keywords

  • Cancer
  • Diagnosis
  • Gene expression profiling
  • Protein interaction networks
  • Reproducibility of biomarkers

ASJC Scopus subject areas

  • Genetics

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