Overexpression of RNase H1 decreases the induction of phosphorylated H2AX in post‐mitotic cells in response to topoisomerase 1 cleavage complexes. Overexpression.

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Overexpression of RNase H1 decreases the induction of phosphorylated H2AX in post‐mitotic cells in response to topoisomerase 1 cleavage complexes. Overexpression of RNase H1 decreases the induction of phosphorylated H2AX in post‐mitotic cells in response to topoisomerase 1 cleavage complexes. (A–C) Rat neurons transfected with GFP–RNase H1 or with GFP alone containing nuclear targeting sequences (GFP–nuc) were treated with CPT (10 μM, 1 h) before staining for γ‐H2AX (red) and GFP (green). (A) Representative pictures. Scale bar, 5 μm. (B) Quantification of γ‐H2AX signal intensity per nucleus (average±standard deviation). (C) Number of γ‐H2AX foci per nucleus (130 nuclei were analysed). Boxes: 25–75 percentile range; whiskers: 10–90 percentile range; horizontal bars: median number of γ‐H2AX foci. Each dot indicates an individual nucleus that is not in the 10–90 percentile range. Asterisks in (B) and (C) denote significant difference from CPT‐treated GFP–nuc transfected cells (P<0.001; t‐test). CPT, camptothecin; GFP, green fluorescent protein; γ‐H2AX, phosphorylated histone H2AX. Olivier Sordet et al. EMBO Rep. 2009;10:887-893 © as stated in the article, figure or figure legend