Unknown,Transcriptomics,Genomics,Proteomics

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An interspecies analysis reveals sequence determinants of the bivalent chromatin state

ABSTRACT: The sequence determinants of chromatin bivalency remain unclear. We analysed sequence determinants of chromatin bivalency genome-wide in several mammalian species and performed a series of transgenic experiments in mouse ES cells. Genome-wide mapping of H3K27me3 in rat ES cells and ChIP-seq with anti-Ezh2 antibody in transgenic mouse ES cells

ORGANISM(S): Rattus norvegicus

SUBMITTER: Magnus Lynch

PROVIDER: E-GEOD-27580 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

An interspecies analysis reveals a key role for unmethylated CpG dinucleotides in vertebrate Polycomb complex recruitment.

Lynch Magnus D MD Smith Andrew J H AJ De Gobbi Marco M Flenley Maria M Hughes Jim R JR Vernimmen Douglas D Ayyub Helena H Sharpe Jacqueline A JA Sloane-Stanley Jacqueline A JA Sutherland Linda L Meek Stephen S Burdon Tom T Gibbons Richard J RJ Garrick David D Higgs Douglas R DR

The EMBO journal 20111104 2

The role of DNA sequence in determining chromatin state is incompletely understood. We have previously demonstrated that large chromosomal segments from human cells recapitulate their native chromatin state in mouse cells, but the relative contribution of local sequences versus their genomic context remains unknown. In this study, we compare orthologous chromosomal regions for which the human locus establishes prominent sites of Polycomb complex recruitment in pluripotent stem cells, whereas the ...[more]

PMID: 22056776

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Project description:Histone variants complement and integrate histone post-translational modifications in regulating transcription. The histone variant macroH2A1 (mH2A1) is almost three times the size of its canonical H2A counterpart due to the presence of a ~25kDa evolutionarily conserved non-histone macro domain. Strikingly, mH2A1 can mediate both gene repression and activation. However, the molecular determinants conferring these alternative functions remain elusive. Here, we report that mH2A1.2 is required for the activation of the myogenic gene regulatory network and muscle cell differentiation. H3K27 acetylation at prospective enhancers is exquisitely sensitive to mH2A1.2, indicating a role of mH2A1.2 in imparting enhancer activation. Both H3K27 acetylation and recruitment of the transcription factor Pbx1 at prospective enhancers are regulated by mH2A1.2. Overall, our findings indicate a role of mH2A1.2 in marking regulatory regions for activation. To establish the role of the histone variant mH2A1.2 in skeletal muscle differentiation we employed the mouse skeletal muscle C2C12 cell line and examined the genome wide distribution mH2A1.2 in myoblast (MB) and myotube (MT) (two replicates). We intersected the distribution of mH2A1.2 with active (H3K4me3 and H3K4me1 from published dataset, and H3K27ac, two replicates) and repressive (H3K27me3, two replicates) epigenetic marks in MB and MT. To gain insite on how chromatin accessibility is remodelled when muscle cells are induced to differentiate, we performed ATAC-seq in C2C12 MB and MT (2 replicates). We then evaluated whether mH2A1.2 was involved in conferring H3K27 acetylation during skeletal muscle differentiation by performing H3K27ac ChIP-seq (two replicates) upon mH2A1.2i in MB and MT. We also prefomred the ChIP-Seq for transcription factor Pbx1 in control and mH2A1.2i cells in MT to address the potential role of mH2A in recruitment of Pbx1. RNA-seq experiments were performed in control and mH2A1.2i C2C12 cells at the stage of MB and MT (three replicates). When mH2A1.2i C2C12 MB were induced to differentiate, a global effect on transcription was observed.

Project description:Epigenetic modification of the mammalian genome by DNA methylation (5-methylcytosine) has a profound impact on chromatin structure, gene expression and maintenance of cellular identity. Recent demonstration that members of the Ten-eleven translocation (Tet) family proteins can convert 5-methylcytosine (5mC) to 5-hydroxymethylcytosine (5hmC) raised the possibility that Tet proteins are capable of establishing a distinct epigenetic state. We have recently demonstrated that Tet1 is specifically expressed in murine embryonic stem (ES) cells and is required for ES cell self-renewal and maintenance. Using chromatin immunoprecipitation coupled with high-throughput DNA sequencing (ChIP-seq), here we show that Tet1 is preferentially bound to CpG-rich sequences at promoters of both transcriptionally active and Polycomb-repressed genes. Despite a general increase in levels of DNA methylation at Tet1 binding-sites, Tet1 depletion does not lead to down-regulation of all the Tet1 targets. Interestingly, while Tet1-mediated promoter hypomethylation is required for maintaining the expression of a group of transcriptionally active genes, it is also required for repression of Polycomb-targeted developmental regulators. Tet1 contributes to silencing of this group of genes by facilitating recruitment of PRC2 to CpG-rich gene promoters. Thus, our study not only establishes a role for Tet1 in modulating DNA methylation levels at CpG-rich promoters, but also reveals a dual function of Tet1 in promoting transcription of pluripotency factors as well as participating in the repression of Polycomb-targeted developmental regulators. Chromatin or genomic DNA extracted from control (Con) or Tet1 knockdown (KD) mouse ES cells was immunoprecipitated with indicated antibodies and analyzed by NimbleGen 2.1M mouse whole genome tiling microarrays (a 4-array set covering the entired non-repetitive portion of mouse genome). Whole cell extract (WCE) was used as input controls in IP/input experiments. In IP/IP experiments, immunoprecipitated DNA from Con KD and Tet1 KD ES cells was directly compared on the same microarrays.

Dataset Information

An interspecies analysis reveals sequence determinants of the bivalent chromatin state

Publications

An interspecies analysis reveals a key role for unmethylated CpG dinucleotides in vertebrate Polycomb complex recruitment.

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