Genome-wide analysis of mRNAs regulated by the nonsense-mediated and 5' to 3' mRNA decay pathways in yeast
Biochemistry & Molecular Pharmacology
Graduate School of Biomedical Sciences; Department of Molecular Genetics and Microbiology
Medical Subject Headings
Cluster Analysis; *Codon, Nonsense; Endoribonucleases; Exoribonucleases; Gene Expression Profiling; *Gene Expression Regulation, Fungal; *Genome, Fungal; Oligonucleotide Array Sequence Analysis; Open Reading Frames; RNA, Fungal; RNA, Messenger; RNA-Binding Proteins; Reproducibility of Results; Saccharomyces cerevisiae; Saccharomyces cerevisiae Proteins
Life Sciences | Medicine and Health Sciences
Transcripts regulated by the yeast nonsense-mediated and 5' to 3' mRNA decay pathways were identified by expression profiling of wild-type, upf1Delta, nmd2Delta, upf3Delta, dcp1Delta, and xrn1Delta cells. This analysis revealed that inactivation of Upf1p, Nmd2p, or Upf3p has identical effects on global RNA accumulation; inactivation of Dcp1p or Xrn1p exhibits both common and unique effects on global RNA accumulation but causes upregulation of only a small fraction of transcripts; and the majority of transcripts upregulated in upf/nmd strains are also upregulated to similar extents in dcp1Delta and xrn1Delta strains. Our results define the core transcripts regulated by NMD, identify several novel structural classes of NMD substrates, demonstrate that nonsense-containing mRNAs are primarily degraded by the 5' to 3' decay pathway even in the absence of functional NMD, and indicate that 3' to 5' decay, not 5' to 3' decay, may be the major mRNA decay activity in yeast cells.
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Citation: Mol Cell. 2003 Dec;12(6):1439-52.