Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

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Dynamics of 5-hydroxymethylcytosine and chromatin marks in mammalian neurogenesis

ABSTRACT: H3K36me3 (ChIp-ChIp), H3K4me3 (ChIp-ChIp), H3K27me3 (ChIp-ChIp), 5mC (MIRA) and 5hmC (hMeDIP) profiles were analyzed in neural progenitor cells (NPC) and neurons by using Nimblegen Mouse ChIP-chip 2.1M Economy Whole-Genome Tiling - 4 Array Set. In order to compare two different techniques of 5hmC profiling, we performed 5hmC profiling with Hydroxymethyl Collector™ Kit (Active Motif) method and hybridized it on mouse Chr7 fragment (Nimblegen). As an independent experiment, 5hmC profiling was performed by using hMeDIP method and hybridized on mouse Chr7 fragment (Nimblegen). After MIRA enrichment and genome amplification, DNA was hybridized on mouse Chr7 fragment (Nimblegen). Analysis of epigenetic changes during neural differentiation due to comparisson of epigenetic patterns in neural progenitor cells versus neurons.

ORGANISM(S): Mus musculus

SUBMITTER: Xiwei Wu

PROVIDER: E-GEOD-38118 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:DNA hydroxymethylation (5hmC) represents a new layer of epigenetic regulation in addition to DNA methylation (5mC). The genome-wide patterns of 5hmC distribution in many tissues and cells have recently been revealed by hydroxymethylated DNA immunoprecipitation (hMeDIP) followed by high throughput sequencing or tiling arrays. However, the DNA hydroxymethylome data generated by the conventional hMeDIP-seq method can not be used for direct quantitative comparison across different samples. In this study, we report a new quantitative hMeDIP-seq method, which uses barcode technology to label different DNA samples and performs hMeDIP-seq for multiple samples in one reaction system. Using this new method, we profiled and compared the DNA hydroxymethylomes of mouse ES cells (ESCs) and mouse ESCs-derived neural progenitor cells (NPCs). 5hmC levels around TSS in either ESCs or NPCs had negative correlation with gene expression levels，while 5hmC levels at gene body regions had different correlation with gene expression, depending on cell types. We identified differential hydroxymethylated regions (DHMRs) by comparing the 5hmC density of all 5hmC peaks between ESCs and NPCs. Many selected DHMRs (e.g., Ankrd23, Hist1h2aa, Fbxw7, and Epha2) were validated by hMeDIP-qPCR. Furthermore, we analyzed the relationship between the alteration of DNA hydroxymethylation and the gene expression change during neural differentiation, and our data suggest that both up- and down-regulated genes exhibited dramatic decrease in 5hmC during neural differentiation while the alteration of 5hmC had weak positive correlation with the changes in gene expression. Taken together, our data demonstrate that quantitative hMeDIP-seq is a powerful approach for genome-wide comparison of DNA hydroxymethylation across multiple samples. Importantly, the DHMRs between ESCs and NPCs uncovered in this study may provide clues for further investigation of the function of 5hmC in gene regulation and neural differentiation. Comparision of the genome-wide distribution of 5hmC in mouse embryonic stem cells and mouse ES-derived neural progenitor cells.

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Dynamics of 5-hydroxymethylcytosine and chromatin marks in mammalian neurogenesis

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