Nonsense surveillance regulates expression of diverse classes of mammalian transcripts and mutes genomic noise - PubMed (original) (raw)
. 2004 Oct;36(10):1073-8.
doi: 10.1038/ng1429. Epub 2004 Sep 26.
Affiliations
- PMID: 15448691
- DOI: 10.1038/ng1429
Free article
Nonsense surveillance regulates expression of diverse classes of mammalian transcripts and mutes genomic noise
Joshua T Mendell et al. Nat Genet. 2004 Oct.
Free article
Erratum in
- Nat Genet. 2004 Nov;36(11):1238
Abstract
Premature termination codons induce rapid transcript degradation in eukaryotic cells through nonsense-mediated mRNA decay (NMD). This pathway can modulate phenotypes arising from nonsense or frameshift mutations, but little is known about the physiologic role of NMD in higher eukaryotes. To address this issue, we examined expression profiles in mammalian cells depleted of Rent1 (also called hUpf1), a factor essential for NMD. Upregulated transcripts included those with upstream open reading frames in the 5' untranslated region, alternative splicing that introduces nonsense codons or frameshifts, introns in the 3' untranslated region or selenocysteine codons. Transcripts derived from ancient transposons and endogenous retroviruses were also upregulated. These RNAs are unified by the presence of a spliced intron at least 50 nucleotides downstream of a termination codon, a context sufficient to initiate NMD. Consistent with direct regulation by NMD, representative upregulated transcripts decayed more slowly in cells deficient in NMD. In addition, inhibition of NMD induced by amino acid starvation upregulated transcripts that promote amino acid homeostasis. These results document that nonsense surveillance is a crucial post-transcriptional regulatory event that influences the expression of broad classes of physiologic transcripts, has been functionally incorporated into essential homeostatic mechanisms and suppresses expression of evolutionary remnants.
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