Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

CpG Methylation profile of Invasive Prostate Cancer Cells compared to Non-invasive

ABSTRACT: Two established cell lines, LNCaP and DU145 and two primary prostate cancer cell lines, PCSC1-2 were invaded toward a stem cell media through Matrigel. DNA was isolated from Non-invasive cells and invasive cells. Methylated DNA was isolated from each sample using the Methyl Collector kit from Active Motif. Methylated and Non-Methylated DNA was dye labeled and applied to 244K Human promoter tiling arrays.

ORGANISM(S): Homo sapiens

SUBMITTER: Lesley Mathews

PROVIDER: E-GEOD-25824 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

Epigenetic regulation of CpG promoter methylation in invasive prostate cancer cells.

Mathews Lesley A LA Hurt Elaine M EM Zhang Xiaohu X Farrar William L WL

Molecular cancer 20101007

<h4>Background</h4>Recently, much attention has been focused on gaining a better understanding of the different populations of cells within a tumor and their contribution to cancer progression. One of the most commonly used methods to isolate a more aggressive sub-population of cells utilizes cell sorting based on expression of certain cell adhesion molecules. A recently established method we developed is to isolate these more aggressive cells based on their properties of increased invasive abil ...[more]

PMID: 20929579

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Project description:Methylation of DNA at CpG dinucleotides represents one of the most important epigenetic mechanisms involved in the control of gene expression in vertebrate cells. In this report, we conducted high-throughput nucleosome reconstitution experiments on 572 KB of human DNA and 668 KB of mouse DNA that was unmethylated or methylated in order to investigate the effects of this epigenetic modification on the positioning and stability of nucleosomes. The DNA loci from both species contained the genes that encode the serum albumin family, the MYC protein, and the tumor suppressor p53. The results demonstrated that a small subset of nucleosomes positioned by nucleotide sequence was sensitive to methylation where the modification increased the affinity of these sequences for the histone octamer. The features that distinguished these nucleosomes from the bulk of the methylation-insensitive nucleosomes were an increase in the frequency of CpG dinucleotides and a unique rotational orientation of CpGs such that their minor grooves tended to face toward the histones in the nucleosome rather than away. We propose that these features serve to enhance the affinity of methylated DNA for the histone octamer and that this effect could be involved in gene regulatory mechanisms such as silencing. These methylation-sensitive nucleosomes were preferentially associated with exons as compared to introns while unmethylated CpG islands near transcription start sites became enriched in nucleosomes upon methylation. The results of this study suggest that the effects of DNA methylation on nucleosome stability in vitro can recapitulate what has been observed in the cell and provide a direct link between DNA methylation and the structure and function of chromatin. For the human data, there were 3 unmethylated nucleosome replicates, 2 methylated nucleosome replicates, an unmethylated MNase control, and an unmethylated sonicated control. For the mouse data, there were 2 unmethylated nucleosome replicates, 2 methylated nucleosome replicates, an unmethylated MNase control, a methylated MNase control, and an unmethylated sonicated control.

Dataset Information

CpG Methylation profile of Invasive Prostate Cancer Cells compared to Non-invasive

Publications

Epigenetic regulation of CpG promoter methylation in invasive prostate cancer cells.

Similar Datasets

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