Bioinformatics Vol. 17 no. 11 2001
Pages 1067-1076
© 2001 Oxford University Press
Selection of optimal DNA oligos for gene expression arrays
Department of Genetics, Washington University School of Medicine, St Louis, MO 63110, USA
Received on January 11, 2001
; revised on May 29, 2001
; accepted on May 29, 2001
Motivation: High density DNA oligo microarrays are widely used in biomedical research. Selection of optimal DNA oligos that are deposited on the microarrays is critical. Based on sequence information and hybridization free energy, we developed a new algorithm to select optimal short (2025 bases) or long (50 or 70 bases) oligos from genes or open reading frames (ORFs) and predict their hybridization behavior. Having optimized probes for each gene is valuable for two reasons. By minimizing background hybridization they provide more accurate determinations of true expression levels. Having optimum probes minimizes the number of probes needed per gene, thereby decreasing the cost of each microarray, raising the number of genes on each chip and increasing its usage.
Results: In this paper we describe algorithms to optimize the selection of specific probes for each gene in an entire genome. The criteria for truly optimum probes are easily stated but they are not computable at all levels currently. We have developed an heuristic approach that is efficiently computable at all levels and should provide a good approximation to the true optimum set. We have run the program on the complete genomes for several model organisms and deposited the results in a database that is available on-line (http://ural.wustl.edu/~lif/probe.pl).
Availability: The program is available upon request.
Contact: lif{at}ural.wustl.edu; stormo{at}ural.wustl.edu
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