Journal: Nature Communications
Article Title: ANP32E drives vulnerability to ATR inhibitors by inducing R-loops-dependent transcription replication conflicts in triple negative breast cancer
doi: 10.1038/s41467-025-59804-0
Figure Lengend Snippet: a Dot blot showing R-loop abundance in tIMEC, tIMEC-A, and tIMEC-A-H1 cells ± RNaseH1. dsDNA used as internal normalizer. Quantification from three biological replicates (mean ± s.e.m.), unpaired two-tailed t -test p values shown. b Representative PLA images showing proximity between ANP32E and R-loops. Scale bar = 10 µm. c PLA images of pS2RNApol II-PCNA proximity as TRCs marker. Scale bar = 10 µm. d Quantification of PLA foci/nucleus from ( b , c ): tIMEC n = 106/104, tIMEC-A n = 85/84, tIMEC-A-H1 n = 72/75. Unpaired two-tailed t -test p values are shown. e Top: FANCD2 immunofluorescence in EdU+ cells (EdU channel excluded for clarity). Bottom: quantification of FANCD2 foci/nucleus in EdU+ (green violins) and EdU– (gray violins) cells; unpaired two-tailed t -test p values shown. Scale bar = 10 µm. f Alkaline comet assay ± VE822 (1.25 µM, 24 h). Top: representative images, comet quantification (OpenComet) , and DNA intensity heatmaps (CometScore) . Bottom: violin plots of comet tail length; 150–300 cells/condition, three biological replicates. Unpaired two-tailed t -test was used for p value calculation. g Left: representative binucleated (BN) cells with micronuclei (MNi) after Cytochalasin B + Mitomycin C treatment. Right: %BN cells with MNi ± Mitomycin C (0.03 µg/ml) or VE822 (0.027, 0.08, 0.25 µM) treatment. ≥3000 cells/condition on three biological replicates. The barplot reports mean ± s.d. with two-way ANOVA adjusted p values. h Immunostaining of BN cells with MNi that are positive or negative for centromere staining (CREST) after VE822. Phalloidin marks cytoplasm; arrows indicate MNi. Scale bar = 10 µm. i Barplot showing the percentage of BN cells with DSB-derived (acentric) MNi ± Mitomycin C or VE822 treatment. Mean ± s.e.m. from three replicates; 25–60 BN cells/condition were quantified per replicate.
Article Snippet: Primary antibodies against FANCD2 1:100 (NovusBio, NB100-182SS), pRPA32 1:1000 (Bethyl, A300-246A-8), and 53BP1 1:100 (Millipore, MAB3802) were diluted in blocking solution and incubated at RT for 2 h. Next, coverslips were washed in PBS 1x before incubation with Alexa-Fluor-647 specie-specific secondary antibodies (Thermo Fisher, A32728 and A-21245) and either Hoechst 1:2000 for EdU labeled cells or DAPI 1:1000 for simple IF.
Techniques: Dot Blot, Two Tailed Test, Marker, Immunofluorescence, Alkaline Single Cell Gel Electrophoresis, Immunostaining, Staining, Derivative Assay