Nucleic Acids Research, 2003, Vol. 31, No. 23 e151
© 2003 Oxford University Press
Article |
Validation of a novel, fully integrated and flexible microarray benchtop facility for gene expression profiling
febit ag, Käfertaler Strasse 190, 68167 Mannheim, Germany and 1 Carl Zeiss Jena GmbH, Carl Zeiss Group, Business Group: Microscopy, Division: Advanced Imaging Microscopy, Carl-Zeiss-Promenade 10, 07745 Jena, Germany
*To whom correspondence should be addressed. Tel: +49 621 3804 257; Fax: +49 621 3804 400; Email: michael.baum{at}febit.de
Here we describe a novel microarray platform that integrates all functions needed to perform any array-based experiment in a compact instrument on the researchers laboratory benchtop. Oligonucle otide probes are synthesized in situ via a light- activated process within the channels of a three-dimensional microfluidic reaction carrier. Arrays can be designed and produced within hours according to the users requirements. They are processed in a fully automatic workflow. We have characterized this new platform with regard to dynamic range, discrimination power, reproducibility and accuracy of biological results. The instrument detects sample RNAs present at a frequency of 1:100 000. Detection is quantitative over more than two orders of magnitude. Experiments on four identical arrays with 6398 features each revealed a mean coefficient of variation (CV) value of 0.09 for the 6398 unprocessed raw intensities indicating high reproducibility. In a more elaborate experiment targeting 1125 yeast genes from an unbiased selection, a mean CV of 0.11 on the fold change level was found. Analyzing the transcriptional response of yeast to osmotic shock, we found that biological data acquired on our platform are in good agreement with data from Affymetrix GeneChips, quantitative real-time PCR andalbeit somewhat less clearlyto data from spotted cDNA arrays obtained from the literature.
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