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ERCC1 and MUS81–EME1 promote sister chromatid separation by processing late replication intermediates at common fragile sites during mitosis

Abstract

Chromosomal instability (CIN) is a hallmark of tumour initiation and progression1. Some genomic regions are particularly unstable under replication stress, notably common fragile sites2 (CFSs) whose rearrangements in tumour cells contribute to cancer development. Recent work has shown that the Fanconi anaemia (FANC) pathway plays a role in preventing defective chromosome segregation and CIN under conditions of replication stress3. Strikingly, FANCD2 is recruited to regions hosting CFSs on metaphase chromosomes4. To decipher the mechanisms protecting CFSs in G2/M, we searched for proteins that co-localize with FANCD2 on mitotic chromosomes, and identified XPF–ERCC1 and MUS81–EME1, two structure-specific endonucleases. We show that depletion of either ERCC1 or MUS81–EME1 affects accurate processing of replication intermediates or under-replicated DNA that persist at CFSs until mitosis. Depletion of these endonucleases also leads to an increase in the frequency of chromosome bridges during anaphase that, in turn, favours accumulation of DNA damage in the following G1 phase.

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Figure 1: Localization of FANCD2, ERCC1 and MUS81 on mitotic chromosomes.
Figure 2: ERCC1 or MUS81 downregulation induces chromosome segregation defects and mitotic failure.
Figure 3: Analysis of global breaks (breaks per metaphase), breaks at major CFSs, and replication dynamics in cells transfected with the indicated siRNAs.
Figure 4: Frequency of 53BP1 nuclear bodies and CFS breaks in G1 cells.
Figure 5: Model for ERCC1 and MUS81–EME1 endonuclease function in CFS stability during mitosis.

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Acknowledgements

We are grateful to all members of UMR8200 for stimulating discussions. The authors thank S. Salomé-Desnoulez (Imaging and Cytometry Platform of IGR) for image acquisition and data analysis, and A. Bouchard for technical help. The F.R. team was supported by grants from La Ligue Contre le Cancer, Agence Nationale de la Recherche (ANR-08-GENO-0013), INCa-DGOS-INSERM 6043, and Cancer, Aidez la recherche. The M.D. team was supported by Institut National du Cancer (INCa) (2009-1-PLBIO-10-IC-1), by Agence Nationale de la Recherche (ANR-09-GENO-000/repinsCFS) and by Association pour la Recherche sur le Cancer (Subvention Libre no. SL220100601348 and Equipements mi-lourds no 8514).

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Contributions

V.N. and T.W. performed experiments, and V.N., T.W., M.D. and F.R. conceived and designed research, performed data analysis and wrote the manuscript.

Corresponding authors

Correspondence to Michelle Debatisse or Filippo Rosselli.

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The authors declare no competing financial interests.

Integrated supplementary information

Supplementary Figure 1 Confocal microscopy analysis of FANCD2, ERCC1, and MUS81 localisation on mitotic chromosomes.

Peak intensity profiles of FANCD2, ERCC1 and MUS81 along the indicated region of interest (ROI) showing the relative position of each protein (see also 3D-reconstruction in Online Suppl. Videos) are presented. (a) FANCD2 (red) and ERCC1 (green), (b) FANCD2 (red) and MUS81 (green), (c) ERCC1 (red) and MUS81 (green). (d) FANCD2 (red) and MUS81 (green): in this example the ROI traced along one sister chromatid shows the localisation of both proteins in correspondence to a DNA discontinuity (gap). DNA (DAPI) is shown in blue. Scale bar = 10 μm.

Supplementary Figure 2 ERCC1 and MUS81 cellular localisation.

(a) ERCC1 localisation on mitotic chromosomes is independent of FANC pathway proficiency. FANCD2 (red in the merged image) and ERCC1 (green in the merged image) are shown from left to right in FANCC-proficient (top panels) and FANCC-deficient (bottom panels) cells. DNA (DAPI) is blue in the merged image. (b) MUS81 localisation on mitotic chromosomes is independent of FANC pathway proficiency. FANCD2 (red in the merged image) and MUS81 (green in the merged image) are shown from left to right in FANCC-proficient (top panels) and FANCC-deficient (bottom panels) cells. DNA (DAPI) is blue in the merged image. (c) Sub-cellular localisation of MUS81 (upper panels, green in the merged image) and ERCC1 (lower panels, green in the merged image) in untreated HeLa cells. Fibrillarin (red in the merged image) was used as a nucleolar marker. Scale bars = 10 μm.

Supplementary Figure 3 Efficiency of siRNA-mediated depletion of ERCC1, MUS81, XPF, EME1, or ERCC1+MUS81 and its consequences on FANCD2 relocalisation.

(a) Representative Western blots showing the siRNA-mediated depletion of ERCC1, MUS81, XPF, EME1, or ERCC1+MUS81 (E+M) proteins in HeLa cells. CTRL: LacZ siRNA was used as a negative control. Vinculin was used as a loading control for FANCD2, and actin was used as a loading control for ERCC1, MUS81, EME1, and XPF. L/S ratio: The ratio between the monoubiquitinated (Long) and non-monoubiquitinated (Short) forms of FANCD2. (b) Representative Western blot showing the siRNA-mediated depletion of ERCC1, MUS81, or ERCC1+MUS81 (E+M) in untreated and APH-treated primary MRC5 fibroblasts. (c) Quantification of FANCD2 foci positive interphase and mitotic cells, and number of FANCD2 spots per mitotic cells in APH-treated siCTRL, siMUS81, or siERCC1 transfected cells. Data represent the mean of two independent experiments.

Supplementary Figure 4 Effects of endonucleases depletion on replication parameters.

(a) Fork asymmetry as ratio of the longest to the shortest track (fold) in untreated and APH-treated Jeff and MRC5-SV cells transfected with the indicated siRNAs. (b) Inter-origin distance (IOD) in untreated and APH-treated Jeff and MRC5-SV cells transfected with the indicated siRNAs. Inter-origin distance as the length between two adjacent replication initiation events is indicated in kilobases (kb). Horizontal black lines represent the median and median values are shown over the histogram. Between 119 and 172 individual measures were scored for each condition.

Supplementary Figure 5 Cell cycle analysis of Jeff lymphoblasts.

(a) Cell cycle analysis of untreated Jeff lymphoblasts transfected with CTRL, MUS81, ERCC1 or MUS81+ERCC1 siRNAs. BrdU incorporation is plotted against the cellular DNA content. The percentage of each cell cycle phase is indicated. (b) Cell cycle profiles of untreated and APH-treated Jeff cells transfected with the indicated siRNAs. (c) Representative FACS profile of untreated Jeff lymphoblasts. Mitotic cells were detected by staining mitotic protein 2 (MPM-2). Cellular DNA content was detected by propidium-iodide. The percentage of cells in G2 and mitosis is indicated.

Supplementary Figure 6 Full scans of immunoblots presented in Supplementary Fig. S3a,b.

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Relative localization pattern of FANCD2 (D2, red) and ERCC1 (green) on mitotic chromosomes.

3D reconstruction of FANCD2, ERCC1 and MUS81 localization in mitotic cells. Spatial rotation in xyz axes clearly shows that FANCD2 spots flank ERCC1 or MUS81 spots, so that they appear juxtaposed, and are separated on the y axis. Conversely, ERCC1 and MUS81 are largely overlapping, as demonstrated by the yellow signal. (AVI 13967 kb)

Relative localization pattern of FANCD2 (D2, red) and MUS81 (green) on mitotic chromosomes.

3D reconstruction of FANCD2, ERCC1 and MUS81 localization in mitotic cells. Spatial rotation in xyz axes clearly shows that FANCD2 spots flank ERCC1 or MUS81 spots, so that they appear juxtaposed, and are separated on the y axis. Conversely, ERCC1 and MUS81 are largely overlapping, as demonstrated by the yellow signal. (AVI 6173 kb)

Relative localization pattern of ERCC1 (red) and MUS81 (green) on mitotic chromosomes.

3D reconstruction of FANCD2, ERCC1 and MUS81 localization in mitotic cells. Spatial rotation in xyz axes clearly shows that FANCD2 spots flank ERCC1 or MUS81 spots, so that they appear juxtaposed, and are separated on the y axis. Conversely, ERCC1 and MUS81 are largely overlapping, as demonstrated by the yellow signal. (AVI 16293 kb)

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Naim, V., Wilhelm, T., Debatisse, M. et al. ERCC1 and MUS81–EME1 promote sister chromatid separation by processing late replication intermediates at common fragile sites during mitosis. Nat Cell Biol 15, 1008–1015 (2013). https://doi.org/10.1038/ncb2793

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