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- Title
A non- transcriptional function of Yap regulates the DNA replication program in Xenopus laevis.
- Authors
Meléndez García, Rodrigo; Haccard, Olivier; Chesneau, Albert; Narassimprakash, Hemalatha; Roger, Jérôme; Perron, Muriel; Marheineke, Kathrin; Bronchain, Odile
- Abstract
In multicellular eukaryotic organisms, the initiation of DNA replication occurs asynchronously throughout S-phase according to a regulated replication timing program. Here, using Xenopus egg extracts, we showed that Yap (Yes-associated protein 1), a downstream effector of the Hippo signalling pathway, is required for the control of DNA replication dynamics. We found that Yap is recruited to chromatin at the start of DNA replication and identified Rif1, a major regulator of the DNA replication timing program, as a novel Yap binding protein. Furthermore, we show that either Yap or Rif1 depletion accelerates DNA replication dynamics by increasing the number of activated replication origins. In Xenopus embryos, using a Trim-Away approach during cleavage stages devoid of transcription, we found that either Yap or Rif1 depletion triggers an acceleration of cell divisions, suggesting a shorter S-phase by alterations of the replication program. Finally, our data show that Rif1 knockdown leads to defects in the partitioning of early versus late replication foci in retinal stem cells, as we previously showed for Yap. Altogether, our findings unveil a nontranscriptional role for Yap in regulating replication dynamics. We propose that Yap and Rif1 function as brakes to control the DNA replication program in early embryos and post-embryonic stem cells.
- Subjects
DNA replication; YAP signaling proteins; XENOPUS laevis; XENOPUS eggs; CARRIER proteins; WNT signal transduction
- Publication
eLife, 2022, p1
- ISSN
2050-084X
- Publication type
Article
- DOI
10.7554/eLife.75741