Time makes histone H3 modifications drift
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ABSTRACT:
PROVIDER: PRJNA742128 | ENA |
REPOSITORIES: ENA
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Project description:To disclose the epigenetic drift of time passing, we determined the genome-wide distributions of mono- and tri-methylated lysine 4 and acetylated and tri-methylated lysine 27 of histone H3 in the livers of healthy 3, 6 and 12 months old C57BL/6 mice. The comparison of different age profiles of histone H3 marks revealed global redistribution of histone H3 modifications with time, in particular in intergenic regions and near transcription start sites, as well as altered correlation between the profiles of different histone modifications. Moreover, feeding mice with caloric restriction diet, a treatment known to retard aging, preserved younger state of histone H3 in these genomic regions.
2022-07-13 | GSE179090 | GEO
Project description:Chromatin modification through the covalent modifications of histones play crucial role on establishment and propagation of gene expression pattern. Here we sought a global view of histone H3 modifications (tri-M-K4/27 and di-M-K27/36) and occupancy in Arabidopsis thaliana using ChIP combined with high-density tiling microarrays. In these analyses, we included vip3 mutant plants as well to gain an insight into role of Paf1C in plants. Keywords: ChIP on chip
2008-06-30 | GSE7907 | GEO
Project description:Genome-wide mapping of histone H3 modifications in cardiac hypertrophy
| PRJEB1479 | ENA
Project description:Chromatin structure and function is maintained by dynamic protein-protein and protein-nucleic acid interactions. Histones are a family of proteins that are abundant chromatin constituents and that carry numerous post-translational modifications (PTMs). Histone PTMs mediate a variety of biological activities, including recruitment of enzymatic readers, writers and erasers that modulate protein activities, DNA replication, transcription and repair. Individual histone molecules contain multiple co-existing PTMs some of which exhibit crosstalk, i.e. coordinated or mutually exclusive activities. We here present an integrated experimental and computational approach for systems level molecular characterization of PTMs and PTM crosstalk. Using wildtype and engineered mouse embryonic stem cells with perturbations in the Polycomb Repressive Complex 1 (PRC1, suz12-/-), PRC2 (Ring1A/b-/-) and DNA methyltransferases (Dnmt1/3a/3b-/-) we performed comprehensive PTM analysis of histone H3 tails. We identified unique histone H3 PTM features of each of the four cell lines and we detected common combinatorial PTM features across cell lines. Using quantitative middle-down proteomics combined with probabilistic and statistical data analysis we extracted histone H3 PTM profiles for all four mESC systems. PTM crosstalk emerged as mutually exclusive histone PTMs or coordinately regulated PTMs independent of histone peptide abundance in the four model systems. We detected positive crosstalk between adjacent mono-methylated marks but strong negative crosstalk among most of the seven characterized di- and tri-methylations on lysines. We report novel features of PTM interplay involving hitherto poorly characterized arginine methylation and lysine methylation sites in histone H3, including H3R2me, H3R8me and H3K37me, which exhibited specific PTM codes suggesting a particular role in chromatin. All histone H3 PTM data is available in our publicly available CrossTalkDB repository at http://crosstalkdb.bmb.sdu.dk
2016-06-16 | PXD002560 | Pride
Project description:During DNA replication modified parental histones H3-H4 are segregated almost symmetrically to the two daughter DNA strands enabling mitotic inheritance of histone PTMs. Whether heritable histone modifications confer epigenetic regulation by maintaining chromatin states and gene expression is unclear. Using MCM2 histone-binding mutant embryonic stem cells (ESCs) and mass spectrometry, we show that asymmetric segregation of parental histones to the leading strand causes imbalanced inheritance of histone H3K27 methylations to daughter cells.
2023-08-30 | PXD020326 | Pride
Project description:The proteolytic cleavage of histone tails, also termed histone clipping, has been described as a mechanism for permanent removal of post-translational modifications (PTMs) from histone proteins. Such activity has been ascribed to ensure regulatory function in key cellular processes such as differentiation, senescence and transcriptional control for which different histone-specific proteases has been described. However, all these studies were exclusively performed using cell lines cultured in vitro and no clear evidences that histone clipping is regulated in vivo has been reported. Here we show that histone H3 N-terminal tails undergo extensive cleavage in the differentiated cells of the villi fraction of the mouse intestinal epithelium and we investigate histone PTM changes in full-length compared with clipped histone H3.
2021-01-11 | PXD022171 | Pride
Project description:The re-assembly of chromatin following DNA replication is a critical event in the maintenance of genome integrity. Histone H3 acetylation at K56 and phosphorylation at T45 are two important chromatin modifications that accompany chromatin assembly. Here we report a microarray expression study of the protein kinase Pkc1, histone acetyl transferase Rtt109 and histone H3 in Saccharomyces cerevisiae under conditions of replicative stress.
2015-12-04 | E-MTAB-3359 | biostudies-arrayexpress
Project description:Comparison among the following data independent acquisition modes provided on the Waters Synapt G2-S instrument: MSE, MSE with Ion Mobility (HDMSE), and MSE with Ion Mobility and drift time specific collision energies (UDMSE). The following on-column loads and LC gradient lengths have been used for the DDA data (1-20130710-63647): * 200 ng, 90 minutes gradient * 300 ng, 180 minutes gradient * 1000 ng, 180 minutes gradient. DDA data has been processed by using MaxQuant (v.1.3.0.5) software, searching against a organism specific (Homo Sapiens) Uniprot/Swissprot database. FDR has been controlled by using a pseudo-reverse (KR positions kept) database at both protein and peptide levels to 1%. Proteins with less than two peptides (minimum of 6 amino acids length, up to 2 missed cleavages and 3 variable modifications allowed. Variable identifications were : methionine oxidation, fixed modifications were : cysteine carbamidomethylation ) identified have been discarded. A match between runs of a 2 minutes windows among the three technical replicates has been performed.
2013-12-05 | PXD000303 | Pride
Project description:Normal cell type specific histone H3 acetylation of miRNA genes. HMEC and HMF represent two distinct differentiated cell type present in mammary gland each with a distinct phenotype, a distinct epigenotype as well as distinct miRNA expression pattern. The aim of the study was to determine how epigenetic modifications including histone H3 acetylation affect miRNA expression. Two cell types HMEC vs. HMF. Biological replicates: 3 pairs of HMEC-HMF of 3 distinct genotypes. Immunoprecipitation using anti-acetylated histone H3 antibody (06-599, Millipore).
2011-04-05 | E-GEOD-28375 | biostudies-arrayexpress
Project description:The advent of high-throughput sequencing has allowed genome wide profiling of histone modifications by Chromatin ImmunoPrecipitation (ChIP) followed by sequencing (ChIP-seq). In this assay the histone mark of interest is enriched through a chromatin pull-down assay using an antibody for the mark. Due to imperfect antibodies and other factors, many of the sequenced fragments do not originate from the histone mark of interest, and are referred to as background reads. Background reads are not uniformly distributed and therefore control samples are usually used to estimate the background distribution at any given genomic position. The Encyclopedia of DNA Elements (ENCODE) Consortium guidelines suggest sequencing a whole cell extract (WCE, or “input”) sample, or a mock ChIP reaction such as an IgG control, as a background sample. However, for a histone modification ChIP-seq investigation it is also possible to use a Histone H3 (H3) pull-down to map the underlying distribution of histones. In this paper we generated data from a hematopoietic stem and progenitor cell population isolated from mouse foetal liver to compare WCE and H3 ChIP-seq as control samples. The quality of the control samples is estimated by a comparison to pull-downs of histone modifications and to expression data. We find minor differences between WCE and H3 ChIP-seq, such as coverage in mitochondria and behaviour close to transcription start sites. Where the two controls differ, the H3 pull-down is generally more similar to the ChIP-seq of histone modifications. However, the differences between H3 and WCE have a negligible impact on the quality of a standard analysis. WCE and histone H3 ChIP-seq samples are compared to H3K27me3 ChIP-seq and RNA-seq.
2015-01-01 | E-GEOD-59419 | biostudies-arrayexpress