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Coordinated control of replication and transcription by a SAPK protects genomic integrity

AuthorsDuch, Alba; Felipe-Abrio, Irene ; Barroso, Sonia ; Yaakov, Gilad; García-Rubio, María L. ; Aguilera, Andrés ; Posas, Francesc
KeywordsDNA damage checkpoints
DNA replication
Cell biology
Issue Date25-Nov-2012
PublisherNature Publishing Group
CitationNature 493(7430): 116-119 (2013)
AbstractUpon environmental changes or extracellular signals, cells are subjected to marked changes in gene expression 1,2. Dealing with high levels of transcription during replication is critical to prevent collisions between the transcription and replication pathways and avoid recombination events3–5. In response to osmostress, hundreds of stress-responsive genes are rapidly induced by the stress-activated protein kinase (SAPK) Hog1 (ref. 6), even during S phase7. Here we show in Saccharomyces cerevisae that a single signalling molecule, Hog1, coordinates both replication and transcription upon osmostress. Hog1 interacts with and phosphorylates Mrc1, a component of the replication complex8–11. Phosphorylation occurs at different sites to those targeted by Mec1 upon DNA damage8,9. Mrc1 phosphorylation by Hog1 delays early and late origin firing by preventing Cdc45 loading, as well as slowing down replication-complex progression. Regulation of Mrc1 by Hog1 is completely independent of Mec1 and Rad53. Cells carrying a non-phosphorylatable allele of MRC1 (mrc13A) do not delay replication upon stress and show a marked increase in transcription-associated recombination, genomic instability and Rad52 foci. In contrast, mrc13A induces Rad53 and survivalin the presence of hydroxyurea or methylmethanesulphonate. Therefore, Hog1 and Mrc1 define a novel S-phase checkpoint independent of the DNA-damage checkpoint that permits eukaryotic cells to prevent conflicts between DNA replication and transcription, which would otherwise lead to genomic instability when both phenomena are temporally coincident.
Publisher version (URL)http://dx.doi.org/10.1038/nature11675
Appears in Collections:(CABIMER) Artículos
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