RAD54 promotes post-synaptic processing of recombination intermediates at ALT telomeres A Representative images of combined IF and DNA FISH for BLM (IF) and telomeres (FISH).Figure 4Representative images of combined IF and DNA FISH for BLM (IF) and telomeres (FISH). HuO9 cells were transfected with 20nM siRAD54#2 for 48 hours. Scale bars = 10 µm Quantification of data shown in A. Cells were counted positive if they contained at least 1 colocalization event between BLM and telomeres. Data were normalized to mock condition of each repeat. At least 100 cells per condition per repeat were counted, n=3. Values shown are mean±sd. Conditions were analyzed using unpaired two-tailed student's t-test. Representative images of IF-DNA FISH for MUS81 and telomeres. HuO9 cells were transfected with 20nM siRAD54 #2 for 48 hours prior to staining. Scale bars = 10 µm Quantification of data shown in C. Cells were counted positive if they contained at least 1 colocalization event between MUS81 and telomeres. At least 100 cells per condition were counted per repeat. n=5, values shown are mean±sd. Conditions were analyzed using unpaired two-tailed student's t-test. Representative images of HuO9 and SaOS2 chromosomes with or without an exchange event. Colocalization of green and red signal indicates an exchange event. Quantification of telomere sister chromatid exchange events. Cells were transfected with 20nM of siRNA for 48 hours prior to the addition of BrdU/BrdC. Metaphases were imaged by confocal microscopy and each data point represents a metaphase. For each condition, there were 3 biological repeats with a total of at least 1300 chromosome ends quantified. Values shown are mean±sem. Conditions were analyzed using two-way ANOVA followed by Sidak's test. Representative images of UFB detection staining for PICH in HuO9 cells. Cells were transfected with 20nM of noted siRNAs for 72 hrs. Scale bars = 10 µm Quantification of data shown in G. Anaphases were scored from 4 independent experiments (mock), or 3 independent experiments (remaining conditions). Anaphases were considered positive for UFB if there was PICH staining between DAPI bodies. Single knockdown conditions had >50 anaphases scored. Combined knockdown conditions had >88 anaphases scored. Values shown are mean±sd. Conditions were compared using one-way ANOVA followed by Dunnett's multiple comparison test. Quantification of data shown in G. Number of PICH stained UFBs counted per anaphase. Values shown are total counts over 3 independent experiments, shown mean±sem. Total number of anaphases per condition were as follows: Mock n=134, siBLM/siSLX4 n=90, siRAD54/siSLX4 n=96, siRAD54/siBLM/siSLX4 n=88. Conditions were compared using Kruskal-Wallis test followed by Dunn's multiple comparison test. Representative images of UFB staining for TRF2 in HuO9 cells. Cells were transfected with 20nM siRAD54#2 alone or cotransfected siRAD54#2 and siSLX4 for 72 hours prior to staining. Scale bars = 10 µm Quantification of data shown in J. Anaphases were scored from 3 independent experiments. A total of 90 anaphases were scored per condition. Values shown are mean±sd. Conditions were compared using one-way ANOVA followed by Dunnett's multiple comparison test. Quantification of micronuclei from HuO9 cells transfected with siRAD54#2 alone or siRAD54#2 cotransfected with siSLX4 for 48 hours. Micronuclei containing telomeric DNA were identified using DAPI and telomere FISH. Micronuclei were normalized to the number of nuclei counted. Values shown are mean±sd of n=3 biological replicates. Conditions were compared using one-way ANOVA followed by Dunnett's multiple comparison test.