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A Gene Expression Map for the Euchromatic Genome of Drosophila melanogaster
Viktor Stolc,1,5*Zareen Gauhar,1,2*Christopher Mason,2*Gabor Halasz,7Marinus F. van Batenburg,7,9Scott A. Rifkin,2,3Sujun Hua,2Tine Herreman,2Waraporn Tongprasit,6Paolo Emilio Barbano,2,4Harmen J. Bussemaker,7,8Kevin P. White2,3
We used a maskless photolithography method to produce DNA oligonucleotidemicroarrays with unique probe sequences tiled throughout thegenome of Drosophila melanogaster and across predicted splicejunctions. RNA expression of protein coding and nonprotein codingsequences was determined for each major stage of the life cycle,including adult males and females. We detected transcriptionalactivity for 93% of annotated genes and RNA expression for 41%of the probes in intronic and intergenic sequences. Comparisonto genome-wide RNA interference data and to gene annotationsrevealed distinguishable levels of expression for differentclasses of genes and higher levels of expression for genes withessential cellular functions. Differential splicing was observedin about 40% of predicted genes, and 5440 previously unknownsplice forms were detected. Genes within conserved regions ofsynteny with D. pseudoobscura had highly correlated expression;these regions ranged in length from 10 to 900 kilobase pairs.The expressed intergenic and intronic sequences are more likelyto be evolutionarily conserved than nonexpressed ones, and about15% of them appear to be developmentally regulated. Our resultsprovide a draft expression map for the entire nonrepetitivegenome, which reveals a much more extensive and diverse setof expressed sequences than was previously predicted.
1 Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, CT 06520, USA. 2 Department of Genetics, Yale University, New Haven, CT 06520, USA. 3 Department of Ecology and Evolutionary Biology, Yale University, New Haven, CT 06520, USA. 4 Department of Mathematics, Yale University, New Haven, CT 06520, USA. 5 Genome Research Facility, NASA Ames Research Center, Mail Stop 239-11, Moffett Field, CA 94035, USA. 6 Eloret Corporation, Sunnyvale, CA 94087, USA. 7 Department of Biological Sciences, Columbia University, New York, NY 10027, USA. 8 Center for Computational Biology and Bioinformatics, Columbia University, New York, NY 10027, USA. 9 Bioinformatics Laboratory, Academic Medical Center, University of Amsterdam, 1100 DE Amsterdam, Netherlands.
* These authors contributed equally to this work.
To whom correspondence should be addressed. E-mail: kevin.white{at}yale.edu
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