Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Genome Wide Profiling of p53 Response to Differentiation or DNA Damage of Human Embryonic Stem Cells

ABSTRACT: Tumor suppressor p53 promotes differentiation of human embryonic stem cells (hESCs), but an in-depth understanding of mechanism is lacking. Here, we define p53 functions in hESCs by genome wide profiling of p53 chromatin interactions and intersection with gene expression during early differentiation and in response to DNA damage. During differentiation, p53 targets and regulates a unique collection of genes, many of which encode transcription factors and developmental regulators with chromatin structure poised by OCT4 and NANOG and marked by repressive H3K27me3 in pluripotent hESCs. In contrast, genes associated with cell migration and motility are bound by p53 specifically after DNA damage. Surveillance functions of p53 in regulation of cell death and cell cycle genes are conserved during both DNA damage and differentiation. Our findings expand the registry of p53 -regulated genes in hESCs and define specific functions of p53 in opposing pluripotency, which are highly distinct from stress-induced p53 response in stem cells. Identification of p53 binding sites in hESC under three conditions : Pluripotent, DNA damaged, Differentiating

ORGANISM(S): Homo sapiens

SUBMITTER: Kadir Akdemir

PROVIDER: E-GEOD-39912 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Genome-wide profiling reveals stimulus-specific functions of p53 during differentiation and DNA damage of human embryonic stem cells.

Akdemir Kadir C KC Jain Abhinav K AK Allton Kendra K Aronow Bruce B Xu Xueping X Cooney Austin J AJ Li Wei W Barton Michelle Craig MC

Nucleic acids research 20130927 1

How tumor suppressor p53 selectively responds to specific signals, especially in normal cells, is poorly understood. We performed genome-wide profiling of p53 chromatin interactions and target gene expression in human embryonic stem cells (hESCs) in response to early differentiation, induced by retinoic acid, versus DNA damage, caused by adriamycin. Most p53-binding sites are unique to each state and define stimulus-specific p53 responses in hESCs. Differentiation-activated p53 targets include m ...[more]

PMID: 24078252

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Project description:Exposure to lead (Pb) during childhood can result in learning disabilities and behavioral problems. Although described in animal models, whether Pb exposure also alters neuronal differentiation in the developing brains of exposed children is unknown. Here, we investigated the effects of physiologically relevant concentrations of Pb (from 0.4 to 1.9 M-BM-5M or 0 to 40M-BM-5g/dl) on the capacity of human embryonic stem cells (hESCs) to progress to a neuronal fate. We found that neither acute nor chronic exposure to Pb prevented hESCs from generating neural precursor cells (NPCs). NPCs derived from hESCs chronically exposed to 1.9 M-BM-5M or 40M-BM-5g/dl Pb throughout the neural differentiation process generated 2.5 times more TUJ1-positive neurons than those derived from control hESCs. Pb exposure of hESCs during the stage of neural rosette formation resulted in a significant decrease in the expression levels of the neural marker genes PAX6 and MSI1. Furthermore, the resulting NPCs differentiated into neurons with shorter neurites and less branching than control neurons, as assessed by Sholl analysis. DNA methylation studies of control, acutely treated hESCs and NPCs derived from chronically exposed hESCs using the Illumina HumanMethylation450 BeadChipM-BM-. demonstrated that Pb exposure induced changes in the methylation status of genes involved in neurogenetic signaling pathways. In summary, our study shows that exposure to Pb subtly alters the neuronal differentiation of exposed hESCs and that these changes could be partly mediated by modifications in the DNA methylation status of genes crucial to brain development. We analyzed the methylation profile of undifferentiated (n=2 independent experiments) and differentiating (n=2 independent experiments) human embryonic stem cells (hESCs) acutely exposed to losed to lead (Pb) and neural precursor cells derived from hESCs chronically exposed to Pb throughout the neural differentiation process (n=3 independent experiments).

Dataset Information

Genome Wide Profiling of p53 Response to Differentiation or DNA Damage of Human Embryonic Stem Cells

Publications

Genome-wide profiling reveals stimulus-specific functions of p53 during differentiation and DNA damage of human embryonic stem cells.

Similar Datasets

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