Unknown,Transcriptomics,Genomics,Proteomics

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Genome-wide bisulfite sequencing reveal enhancer as main target of DNA methylation in neural conversion

ABSTRACT: Genome-wide bisulfite sequencing and corresponding transcriptome are analyzed together to seek for methylation target during neural differentiation H1 human embryonic stem cells are able to differentiated into neural stem cells with induction of compound C in 72h. We extracted RNA from 0, 12, 24, 36, 48, 72h samples during dinduction and measured their expression level with Illumina microarray, with 4 replicates each time point.

ORGANISM(S): Homo sapiens

SUBMITTER: Gang Liu

PROVIDER: E-GEOD-68624 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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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).

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Genome-wide bisulfite sequencing reveal enhancer as main target of DNA methylation in neural conversion

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