Abstract
Gene expression is an inherently complex process and errors often occur during the transcription and processing of mRNAs. Several surveillance mechanisms have evolved to check the fidelity at each step of mRNA manufacture. Two recent reports describe the identification of a novel pathway in eukaryotes that recognizes and degrades mRNAs that lack a stop codon. The non-stop decay mechanism releases ribosomes stalled at the 3' end of a mRNA and stimulates the exosome to rapidly degrade the transcript.
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