These authors contributed equally to this work.
Plant γH2AX foci are required for proper DNA DSB repair responses and colocalize with E2F factors
Article first published online: 16 FEB 2012
© 2012 INRA. New Phytologist © 2012 New Phytologist Trust
Volume 194, Issue 2, pages 353–363, April 2012
How to Cite
Lang, J., Smetana, O., Sanchez-Calderon, L., Lincker, F., Genestier, J., Schmit, A.-C., Houlné, G. and Chabouté, M.-E. (2012), Plant γH2AX foci are required for proper DNA DSB repair responses and colocalize with E2F factors. New Phytologist, 194: 353–363. doi: 10.1111/j.1469-8137.2012.04062.x
- Issue published online: 19 MAR 2012
- Article first published online: 16 FEB 2012
- Received: 13 September 2011, Accepted: 22 December 2011
- BY-2 cells;
- DNA double-strand breaks (DSBs);
- DNA repair;
- E2F factor;
- repair foci
- •Cellular responses to DNA double-strand breaks (DSBs) are linked in mammals and yeasts to the phosphorylated histones H2AX (γH2AX) repair foci which are multiproteic nuclear complexes responsible for DSB sensing and signalling. However, neither the components of these foci nor their role are yet known in plants.
- •In this paper, we describe the effects of γH2AX deficiency in Arabidopsis thaliana plants challenged with DSBs in terms of genotoxic sensitivity and E2F-mediated transcriptional responses.
- •We further establish the existence, restrictive to the G1/S transition, of specific DSB-induced foci containing tobacco E2F transcription factors, in both A. thaliana roots and BY-2 tobacco cells. These E2F foci partially colocalize with γH2AX foci while their formation is ataxia telangiectasia mutated (ATM)-dependent, requires the E2F transactivation domain with its retinoblastoma-binding site and is optimal in the presence of functional H2AXs.
- •Overall, our results unveil a new interplay between plant H2AX and E2F transcriptional activators during the DSB response.