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An mRNA Surveillance Mechanism That Eliminates Transcripts Lacking Termination Codons
Pamela A. Frischmeyer,1Ambro van Hoof,34Kathryn O'Donnell,1Anthony L. Guerrerio,2Roy Parker,34Harry C. Dietz14*
Translation is an important mechanism to monitor the
quality of messenger RNAs (mRNAs), as exemplified by the
translation-dependentrecognition and degradation of transcripts
harboring prematuretermination codons (PTCs) by the nonsense-mediated
mRNA decay(NMD) pathway. We demonstrate in yeast that mRNAs lacking
alltermination codons are as labile as nonsense transcripts. Decayof
"nonstop" transcripts in yeast requires translation but ismechanistically distinguished from NMD and the major mRNA turnoverpathway that requires deadenylation, decapping, and 5'-to-3'
exonucleolyticdecay. These data suggest that nonstop decay is
initiated whenthe ribosome reaches the 3' terminus of the message. We
demonstratemultiple physiologic sources of nonstop transcripts and
conservationof their accelerated decay in mammalian cells. This
process regulatesthe stability and expression of mRNAs that fail to
signal translationaltermination.
1 Institute for Genetic Medicine,
2 Department of Biophysics and Biophysical
Chemistry, Johns Hopkins University School of Medicine, Baltimore, MD
21205, USA.
3 University of Arizona, Department of
Molecular and Cellular Biology, Tucson, AZ 85721, USA.
4 Howard Hughes Medical Institute.
*
To whom correspondence should be addressed. E-mail:
hdietz{at}jhmi.edu
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In Science Magazine
PERSPECTIVES
Lynne E. Maquat (22 March 2002) Science295 (5563), 2221.
[DOI: 10.1126/science.1071285] |Summary »|Full Text »|PDF »
REPORTS
Ambro van Hoof, Pamela A. Frischmeyer, Harry C. Dietz, and Roy Parker (22 March 2002) Science295 (5563), 2262.
[DOI: 10.1126/science.1067272] |Abstract »|Full Text »|PDF »|Supplemental Data »
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