DNA recombination at sites of replication damage in BLM-deficient cells. DNA recombination at sites of replication damage in BLM-deficient cells. A. Nucleotide.

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DNA recombination at sites of replication damage in BLM-deficient cells. DNA recombination at sites of replication damage in BLM-deficient cells. A. Nucleotide incorporation (IdU; left) under nondenaturing conditions was used as an indicator of replicating ssDNA regions. γ-H2AX (green) and IdUrd (red) colocalized in both transformed and untransformed BLM-defective cells. Right, control images from BLM-proficient cells included for comparison. The low levels of IdUrd and γ-H2AX in GM00037 and PSNF5 cells also colocalized. Line scans are included next to representative image with the red-green colocalization profile. B. The T68 phosphorylated Chk2 foci (green) colocalized with IdUrd (red) in BLM-deficient GM01492 and PSNG13 cells. Right column, control images from BLM-proficient cells. C. Top3α (green) does not colocalize with IdUrd (red) in GM01492 cells lacking BLM, in contrast to GM00037 cells with functional BLM. Arrows, position of faint IdUrd signal in GM00037 cells. D. Rad51 (green) colocalized with replication damage sites (IdU, red) in BLM-deficient GM01492 and PSNG13 cells. Bar, 8 μm. The images shown in A–D are representative examples of at least three independent experiments with at least 30 nuclei included per experimental analysis. V. Ashutosh Rao et al. Mol Cancer Res 2007;5:713-724 ©2007 by American Association for Cancer Research