RT Journal A1 Nuwaysir, Emile F. A1 Huang, Wei A1 Albert, Thomas J. A1 Singh, Jaz A1 Nuwaysir, Kate A1 Pitas, Alan A1 Richmond, Todd A1 Gorski, Tom A1 Berg, James P. A1 Ballin, Jeff A1 McCormick, Mark A1 Norton, Jason A1 Pollock, Tim A1 Sumwalt, Terry A1 Butcher, Lawrence A1 Porter, DeAnn A1 Molla, Michael A1 Hall, Christine A1 Blattner, Fred A1 Sussman, Michael R. A1 Wallace, Rodney L. A1 Cerrina, Franco A1 Green, Roland D. T1 Gene Expression Analysis Using Oligonucleotide Arrays Produced by Maskless Photolithography JF Genome Research JO Genome Research YR 2002 FD November 01 VO 12 IS 11 SP 1749 OP 1755 DO 10.1101/gr.362402 UL http://genome.cshlp.org/content/12/11/1749.abstract AB Microarrays containing 195,000 in situ synthesized oligonucleotide features have been created using a benchtop, maskless photolithographic instrument. This instrument, the Maskless Array Synthesizer (MAS), uses a digital light processor (DLP) developed by Texas Instruments. The DLP creates the patterns of UV light used in the light-directed synthesis of oligonucleotides. This digital mask eliminates the need for expensive and time-consuming chromium masks. In this report, we describe experiments in which we tested this maskless technology for DNA synthesis on glass surfaces. Parameters examined included deprotection rates, repetitive yields, and oligonucleotide length. Custom gene expression arrays were manufactured and hybridized toDrosophila melanogaster and mouse samples. Quantitative PCR was used to validate the gene expression data from the mouse arrays.[The sequence data from this study have been submitted to GEO under accession nos. GPL208, GSM2409, GSM2410, GSM2411, GSM2412, GSM2413, GSM2414, GSE81, GSE82.]