Project description:Exogenous BRCT-GST in U2OS bind to wild-type p53 in a phosphorylation-dependent manner, after UV treatment. BRCT-GST fusion protected cells from apoptotic cell death and impact of miRNAs responsive to p53 activation.
Project description:Exogenous BRCT-GST in U2OS bind to wild-type p53 in a phosphorylation-dependent manner, after UV treatment. BRCT-GST fusion protected cells from apoptotic cell death.
Project description:We report that TAF1 phosphorylates p53 at Thr55 on the p21 promoter and this phosphorylation leads to dissociation of p53 from the promoter. Indeed, ChIP-Seq analysis reveals p53 undergoes promoter dissociation at a global level after response to DNA damage, underscoring general nature of the regulation. UVC treatment at the time points indicated was used to access p53 transcription factor signal induction and termination.
Project description:We used eXcision Repair-sequencing (XR-seq) to map UV induced damage in U2OS cells and in U2OS cells in which CSA or UVSSA genes were knocked out. Complementation of UVSSA knockout with WT or mutant proteins shows UVSSA is a core component of human transcription coupled repair.
Project description:CRISPR screen: U2OS or U2OS p53KO cells expressing Cas9 were transduced with a whole-genome library of CRISPR sgRNAs, then treated with either DMSO or etoposide. Differential sgRNA abundances were calculated for each condition and used to determine the effect of each single gene knockout on fitness and the drug-induced death rate. RNA-Seq: U2OS or U2OS p53KO cells were cultured with either DMSO or etoposide for 48 hours, and then U2OS cells were incubated in this conditioned media for 8 hours. RNA was collected and use to observe differential expression changes between conditions.
Project description:We performed ChIP-seq targeting the glucocorticoid receptor (GR) in the U2OS-GR cell line and the androgen receptor (AR) in the U2OS-AR cell line. The cell lines are derived from U2OS ATTC:HTB-96 and stably transfected with an expression construct for either rat GR or human AR, respectively. The U2OS-GR cells were treated with dexamethasone (1 µM) for 90 minutes. The U2OS-AR cells were treated with R1881 (5 nM) for 4 hours.
Project description:Both p53 and the Wnt signaling pathways play important roles in tumorigenesis and development. However, few studies, particularly on a genome-wide scale, have linked these two pathways. Here we show that p53 directly regulates the Wnt signaling pathway in murine embryonic stem cells (mESCs) using an integrated genome-wide approach. A chromatin-immunoprecipitation-based microarray assay (ChIP-chip) reveals that the Wnt signaling pathway is significantly over-represented in p53 bound genes. Using gene expression microarray and real-time PCR, we demonstrate that the expressions of many Wnts are robustly induced by various stresses, including DNA damage and hypoxia that activate p53. Importantly, the activation of p53 is a prerequisite for the induction of Wnts. Moreover, conditional medium (CM) collected from ultraviolet (UV)-treated mESCs contains an anti-differentiation activity, which can be lowered by either the addition of Wnt signaling inhibitors into the CM or the reduction of p53 levels in UV-treated mESCs. These results suggest that stressed mESCs utilize the p53-Wnt signaling axis to signal neighboring mESCs to delay the differentiation. Together, our results uncover a novel connection between p53 and the Wnt signaling pathways in mediating cell-to-cell communication in mESCs, and provide insights into the functions of these two pathways in tumorigenesis and development
Project description:To better understand the mechanism by which CFZ impacts polyQ toxicity, we conducted a transcriptomic analysis in polyQ94-EGFP expressing U2OS (5μM, 8 days). Data from a transcriptomics experiment in polyQ94-U2OS cells treated with CFZ (5 μM, 8day) was compared to a DMSO-treated control.
