A novel approach for increasing sensitivity and correcting saturation artifacts of radioactively labeled cDNA arrays

Troy D. Querec, Radka Stoyanova, Eric Ross, Christos Patriotis

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Motivation: The radioactivity labeled DNA array platform is a robust and accurate way for a high-throughput measurement of gene expression levels in biological samples. Despite its high degree of sensitivity and reproducibility, this platform has several sources of variation. These are related to the presence of saturation effects in the array images and impede the degree of accuracy at which gene expression levels are determined. Results: Here we describe a simple, but effective, approach for combining expression data from a series of autoradiographic exposures of variable length. This technique increases the sensitivity of this array platform by detecting low-expressed genes at longer exposures. It also improves the measurement accuracy of highly abundant genes by considering only values from the linear portion of dependency between the exposure times and gene intensities. As a result, the described approach improves the outcome of the subsequent steps of array data normalization and mining.

Original languageEnglish (US)
Pages (from-to)1955-1961
Number of pages7
JournalBioinformatics
Volume20
Issue number12
DOIs
StatePublished - Aug 12 2004
Externally publishedYes

ASJC Scopus subject areas

  • Statistics and Probability
  • Biochemistry
  • Molecular Biology
  • Computer Science Applications
  • Computational Theory and Mathematics
  • Computational Mathematics

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