Abstract
Aberrant mRNAs harboring premature termination codons (PTCs or nonsense codons) are degraded by the nonsense-mediated mRNA decay (NMD) pathway. mRNAs transcribed from genes that naturally acquire PTCs during lymphocyte development are strongly downregulated by PTCs. Here we show that a signal essential for this robust mRNA downregulatory response is efficient RNA splicing. Strong mRNA downregulation can be conferred on a poor NMD substrate by either strengthening its splicing signals or removing its weak introns. Efficient splicing also strongly promotes translation, providing a molecular explanation for enhanced NMD and suggesting that efficient splicing may have evolved to enhance both protein production and RNA surveillance. Our results suggest simple approaches for increasing protein expression from expression vectors and treating human genetic diseases caused by nonsense and frameshift mutations.
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Acknowledgements
We thank Y.-J. Liu and Y.-H. Wang for technical advice on FACS analysis, A. Bhalla for technical assistance and G. Cote for useful comments. This study was supported by the US National Institutes of Health grant GM058595 and the Kleberg Fund for Innovative Research Program Allocation for IRG (M.D. Anderson Cancer Center).
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Supplementary information
Supplementary Fig. 1
Deletions in the VDJ exon do not affect NMD. (PDF 248 kb)
Supplementary Fig. 2
A mutation in the 3′ splice site of TCRβ IVS1 dramatically reduces the magnitude of downregulation in response to a PTC. (PDF 134 kb)
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Gudikote, J., Imam, J., Garcia, R. et al. RNA splicing promotes translation and RNA surveillance. Nat Struct Mol Biol 12, 801–809 (2005). https://doi.org/10.1038/nsmb980
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DOI: https://doi.org/10.1038/nsmb980
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