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Genome-wide mapping of nucleosome positioning and DNA methylation within Individual DNA molecules

ABSTRACT: DNA methylation and nucleosome positioning work together to generate chromatin structures that regulate gene expression. Nucleosomes are typically mapped using nuclease digestion requiring significant amounts of material and varying enzyme concentrations. We have developed a method (NOMe-seq) that uses a GpC methyltransferase (M.CviPI) and next generation sequencing to generate a high resolution footprint of nucleosome positioning genome-wide using less than 1 million cells while retaining endogenous DNA methylation information from the same DNA strand. Using a novel bioinformatics pipeline we show a striking anti-correlation between nucleosome occupancy and DNA methylation at CTCF regions, that is not present at promoters. We further show that the extent of nucleosome depletion at promoters is directly correlated to expression level and can accommodate multiple nucleosomes and provide genome-wide evidence that expressed non-CpG island promoters are nucleosome depleted. Importantly, NOMe-seq obtains DNA methylation and nucleosome positioning information from the same DNA molecule, giving the first genome-wide DNA methylation and nucleosome positioning correlation at the single molecule and thus, single cell level that can be used to monitor disease progression and response to therapy.

ORGANISM(S): Homo sapiens

PROVIDER: GSE40770 | GEO | 2012/09/12

SECONDARY ACCESSION(S): PRJNA174848

REPOSITORIES: GEO

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Genome-wide mapping of nucleosome positioning and DNA methylation within Individual DNA molecules

Project description:DNA methylation and nucleosome positioning work together to generate chromatin structures that regulate gene expression. Nucleosomes are typically mapped using nuclease digestion requiring significant amounts of material and varying enzyme concentrations. We have developed a method (NOMe-seq) that uses a GpC methyltransferase (M.CviPI) and next generation sequencing to generate a high resolution footprint of nucleosome positioning genome-wide using less than 1 million cells while retaining endogenous DNA methylation information from the same DNA strand. Using a novel bioinformatics pipeline we show a striking anti-correlation between nucleosome occupancy and DNA methylation at CTCF regions, that is not present at promoters. We further show that the extent of nucleosome depletion at promoters is directly correlated to expression level and can accommodate multiple nucleosomes and provide genome-wide evidence that expressed non-CpG island promoters are nucleosome depleted. Importantly, NOMe-seq obtains DNA methylation and nucleosome positioning information from the same DNA molecule, giving the first genome-wide DNA methylation and nucleosome positioning correlation at the single molecule and thus, single cell level that can be used to monitor disease progression and response to therapy. Nucleosome Occupancy and Methylome-Sequencing (NOMe-Seq) on IMR90 cell line and 2 GBM cell lines

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Project description:Background: Epigenetic modification is a hallmark of cancer cells achieved through altered patterns of DNA methylation, histone modifications and nucleosome positions. These events have only been described in detail at gene promoters. Results: Here, we integrate multiple epigenome-wide maps to evaluate the scope of global epigenetic reprogramming in cancer cells at enhancers and insulators. Using high-resolution simultaneous mapping of global DNA methylation and nucleosome positions within individual DNA strands (NOMe-Seq), we observe a reorganization of the DNA methylome coupled with simultaneous modulation of nucleosome depleted regions (NDRs) at distal regulatory elements in cancer cells. We show that while NDRs are preferentially found at enhancers in normal breast and prostate epithelial cells, there are fewer NDRs coupled with increased DNA methylation detected at enhancersin cancer cells. Our data suggests that the acquisition of a nucleosome is key to DNA hypermethylation susceptibility and contributes to epigenetic silencing of enhancers in cancer, which can notably occur without loss of H3K4me1. Further we observe that NDRs are not necessary for peripheral phasing of adjacent nucleosomes, contrary to the common dogma, and show that nucleosomes remain organized and phased, even in the absence of a NDR as an anchor. Finally we observe the potential for transcription factors (TF) to organize NDRs genome-wide; all TF-binding sites are strongly hypomethylated and some show extensive peripheral nucleosome phasing. Conclusion: Together our findings suggest that, in addition to epigenetic alterations to promoter regions in cancer, there is substantial disruption to the distal regulatory architecture that provides an additional layer of epigenetic plasticity in malignancy. NOMe-seq, ChIP-seq for 5 marks and input control for breast normal (HMEC), breast cancer (MCF7), prostate normal (PrEC) and prostate cancer (PC3) cell lines

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