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Briefings in Functional Genomics and Proteomics Advance Access published online on July 20, 2007
Briefings in Functional Genomics and Proteomics, doi:10.1093/bfgp/elm014
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© Oxford University Press, 2007, All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Oligonucleotide microarrays: widely applied—poorly understood

Alex E. Pozhitkov, Diethard Tautz and Peter A. Noble

Corresponding author. Peter A. Noble, Civil and Environmental Engineering, University of Washington, Seattle, WA 98195, USA. Tel: 206-685-7583; Fax: 206-685-3836; E-mail: panoble{at}washington.edu

Microarray technology, which has been around for almost two decades, now provides an indispensable service to the biomedical research community. Soaring demand for high-throughput screening of genes potentially associated with cancer and other diseases, as well as the increased need for identifying microorganisms, have substantially opened up the application of this technology to many fields of science, including new ones such as array-based comparisons of whole genomes. Yet, despite this significant progress, the fundamental understanding of the pillars of this technology, have been largely unexplored, in particular for oligonucleotide-based microarrays. In fact, most of the current approaches for the design of microarrays are based on ‘common-sense’ parameters, such as guanine-cytosine content, secondary structure, melting temperature or possibility of minimizing the effects of nonspecific hybridization. However, recent experiments suggest that these are inadequate. Here we discuss these results, which challenge the basic principles and assumptions of oligonucleotide microarray technology. It is clear that more systematic physicochemical studies will be required to better understand the hybridization and dissociation behaviour of oligonucleotides.

Keywords: nonspecific hybridization, oligonucleotide arrays, stringent wash, probe design, thermodynamics, kinetics


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