Journal: bioRxiv
Article Title: ATR enforcement of the S/G2 checkpoint prevents premature S phase shutdown and genome instability
doi: 10.64898/2026.05.07.723638
Figure Lengend Snippet: a.) Quantification the percentage of PCNA positive pre-extracted cells in the defined G2 population of control, USP37, or TRAIP knockdown MCF10A cells treated with DMSO, 5μM AZD6738, or 2μM LY2603618 for 16hrs (n=3 biological replicates). A two-way analysis of variance (ANOVA) was performed to assess biological significance. P values: 0.5397 (DMSO siControl versus siUSP37), 0.6511 (DMSO siControl versus siTRAIP), <0.0001 (AZD6738 siControl versus siUSP37), 0.0068 (AZD6738 siControl versus siTRAIP), 0.0003 (LY2603618 siControl versus siUSP37), and 0.0101 (LY2603618 siControl versus siUSP37). Data are presented as mean ± SEM. b.) Scatterplots of mean PCNA intensity versus DNA content in control, USP37, or TRAIP knockdown and pre-extracted MCF10A cells treated with DMSO, 5μM AZD6738, or 2μM LY2603618 for 16hrs. Plots are divided by EdU negative/positive cells and by treatment. The plot is colored by mean yH2AX intensity as denoted by the associated scale. Representative of n=3 biological replicates. c.) Quantification of the percentage of MCM2 positive pre-extracted cells in the defined G2 population of control, USP37, or TRAIP knockdown MCF10A cells treated with DMSO, 5μM AZD6738, or 2μM LY2603618 for 16hrs (n=3 biological replicates). A two-way analysis of variance (ANOVA) was performed to assess biological significance. P values: 0.0837 (DMSO siControl versus siUSP37), 0.8341 (DMSO siControl versus siTRAIP), <0.0001 (AZD6738 siControl versus siUSP37), 0.0433 (AZD6738 siControl versus siTRAIP), 0.0410 (LY2603618 siControl versus siUSP37), and 0.5357 (LY2603618 siControl versus siUSP37). Data are presented as mean ± SEM. d.) Scatterplots of mean MCM2 intensity versus DNA content in control, USP37, or TRAIP knockdown and pre-extracted MCF10A cells treated with DMSO, 5μM AZD6738, or 2μM LY2603618 for 16hrs. Plots are divided by EdU negative/positive cells and by treatment. The plot is colored by mean yH2AX intensity as denoted by the associated scale. Representative of n=3 biological replicates. e.) Quantification of mean yH2AX nuclear intensities across the cell cycle from control, USP37, or TRAIP knockdown and pre-extracted MCF10A cells treated with DMSO, 5μM AZD6738, or 2μM LY2603618 for 16hrs (n=3 biological replicates). Data are presented as mean ± SEM.
Article Snippet: Human MCF10A cells (ATCC, CRL-10317) were grown in DMEM/F12 medium (ThermoFisher Scientific, 11330057) supplemented with 100U/mL penicillin/streptomycin (Thermo Fisher Scientific, 15140122), 5% horse serum (ThermoFisher Scientific, 16050122), 20ng/ml epidermal growth factor (EGF) (Sigma-Aldrich, E5036), 0.5 mg/mL hydrocortisone, 10μg/mL insulin (Sigma-Aldrich, I1882-100MG), and 100ng/mL cholera toxin (Sigma-Aldrich, C8052).
Techniques: Control, Knockdown