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- Title
Antisense artifacts in transcriptome microarray experiments are resolved by actinomycin D.
- Authors
Perocchi, Fabiana; Xu, Zhenyu; Clauder-Münster, Sandra; Steinmetz, Lars M
- Abstract
Recent transcription profiling studies have revealed an unanticipatedly large proportion of antisense transcription across eukaryotic and bacterial genomes. However, the extent and significance of antisense transcripts is controversial partly because experimental artifacts are suspected. Here, we present a method to generate clean genome-wide transcriptome profiles, using actinomycin D (ActD) during reverse transcription. We show that antisense artifacts appear to be triggered by spurious synthesis of second-strand cDNA during reverse transcription reactions. Strand-specific hybridization signals obtained from Saccharomyces cerevisiae tiling arrays were compared between samples prepared with and without ActD. Use of ActD removed about half of the detectable antisense transcripts, consistent with their being artifacts, while sense expression levels and about 200 antisense transcripts were not affected. Our findings thus facilitate a more accurate assessment of the extent and position of antisense transcription, towards a better understanding of its role in cells.
- Publication
Nucleic acids research, 2007, Vol 35, Issue 19, pe128
- ISSN
1362-4962
- Publication type
Journal Article
- DOI
10.1093/nar/gkm683