BRCA1 PARsylation is required for normal HRR tuning.

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Presentation transcript:

BRCA1 PARsylation is required for normal HRR tuning. BRCA1 PARsylation is required for normal HRR tuning. A, a schematic diagram showing the steps in the I-SceI–induced DSB HR repair assay, using cells containing a single copy of the SCR reporter that can measure both short track gene conversion (STGC) and long track gene conversion (LTGC). Tr-GFP: a 5′ truncated GFP fragment; -RFP3′: 3′ exon of the RFP cassette; 5′RFP-: 5′ exon of the RFP cassette; 5′GFP: a 3′ truncated GFP cassette containing the I-SceI recognition sequence. STGC results in a smaller gene conversion track (green dashed line) and only restores the GFP cassette. LTGC results in a longer gene conversion track and duplications (red dashed line) that lead to a functional RFP cassette by restoring the correct order of RFP exons (black dashed line above the GFP cassette on the right). B–D, effects of BRCA1-WT and BRCA1-D5 on STGC and LTGC. U2OS cells containing the SCR reporter were sequentially transfected with BRCA1 siRNA and siRNA-resistant BRCA1-WT or BRCA1-D5. STGC and LTGC assays were performed as described in Methods. B, Western blots showing depletion of endogenous BRCA1 and expression of BRCA1-WT or BRCA1-D5 in these reporter-containing cells. Protein (25 μg) was loaded in each lane, and the blot was probed with antibodies directed against HA (detects HA-tagged BRCA1-WT or BRCA1-D5), BRCA1, or actin. C, results of STGC assay. The STGC frequencies of cells transfected with control siRNA plus vector were normalized to one. D, results of LTGC assay. The LTGC frequencies of cells transfected with control siRNA and vector were normalized to one. E–G, effects of olaparib on STGC and LTGC in cells depleted of BRCA1 or expressing endogenous BRCA1, or depleted of endogenous BRCA1 and expressing ectopic BRCA1-WT or BRCA1-D5. E, Western blots showing depletion of endogenous BRCA1 and reexpression of BRCA1-WT or BRCA1-D5 in cells. These cells were either treated with DMSO or 30 nmol/L olaparib for 48 hours before being transfected with an I-SceI–expressing plasmid. Protein (25 μg) was loaded in each lane, and the blot was probed with HA (detects HA-tagged BRCA1-WT or BRCA1-D5), BRCA1, or actin antibodies. F, results of STGC assay. The STGC frequencies of cells transfected with control siRNA and vector were normalized to one. G, results of LTGC assay. The LTGC frequencies of cells transfected with control siRNA and vector were normalized to one. *, P < 0.05; **, P < 0.01; ***, P < 0.001; ****, P < 0.0001; n.s., not significant. Yiduo Hu et al. Cancer Discovery 2014;4:1430-1447 ©2014 by American Association for Cancer Research