Re-association and localization of R/DNA hybrids in human breast cancer cells (MDA-MB-231) visualized by confocal fluorescence microscopy. (a) FRET experiments: cells were co-transfected with cognate hybrids labeled with Alexa488 and Alexa546 and images were taken on the next day. (b) Dequenching experiments: cells were co-transfected with cognate duplexes, having one duplex labeled with Alexa488 and IowaBlack FQ. Images were taken on the next day. (c–d) Studying the localization of R/DNA hybrids with commonly used markers for endosomal compartments (c) EEA1 and (d) Rab7.
Image numbers in a–d correspond to: differential interference contrast (DIC) images (1), Alexa488 emission (2), Alexa546 emission (3), bleed-through corrected FRET image (4), 3D chart representation of zoomed fragment indicated by a white box of bleed-through corrected FRET image with the yellow star indicating the correspondence (5), EAA1 antibody staining (6), and Rab7 antibody staining (7). Images (1+2+3), (1+4), (1+2), (1+3+6), (1+3+7) are superpositions of two or three different images.