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Translational reprogramming following UVB irradiation is mediated by DNA-PKcs and allows selective recruitment to the polysomes of mRNAs encoding DNA repair enzymes

By Ian R. Powley, Alexander Kondrashov, Lucy A. Young, Helen C. Dobbyn, Kirsti Hill, Ian G. Cannell, Mark Stoneley, Yi-Wen Kong, Julia A. Cotes, Graeme C.M. Smith, Ron Wek, Christopher Hayes, Timothy W. Gant, Keith A. Spriggs, Martin Bushell and Anne E. Willis

Abstract

This paper was published as Genes and Development, 2009, 23 (10), pp. 1207-1220. It is available from http://genesdev.cshlp.org/content/23/10/1207. DOI: 10.1101/gad.516509Metadata only entryUVB-induced lesions in mammalian cellular DNA can, through the process of mutagenesis, lead to carcinogenesis. However, eukaryotic cells have evolved complex mechanisms of genomic surveillance and DNA damage repair to counteract the effects of UVB radiation. We show that following UVB DNA damage, there is an overall inhibition of protein synthesis and translational reprogramming. This reprogramming allows selective synthesis of DDR proteins, such as ERCC1, ERCC5, DDB1, XPA, XPD, and OGG1 and relies on upstream ORFs in the 5′ untranslated region of these mRNAs. Experiments with DNA-PKcs-deficient cell lines and a specific DNA-PKcs inhibitor demonstrate that both the general repression of mRNA translation and the preferential translation of specific mRNAs depend on DNA-PKcs activity, and therefore our data establish a link between a key DNA damage signaling component and protein synthesis

Publisher: Cold Spring Harbor Laboratory Press
Year: 2009
DOI identifier: 10.1101/gad.516509
OAI identifier: oai:lra.le.ac.uk:2381/9460
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