Genome-wide maps of linker histone H1 lysine 85 acetylation in HCT116 cells
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PROVIDER: PRJNA450529 | ENA |
REPOSITORIES: ENA
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Project description:We identify acetylation of linker histone H1 lysine 85 as a novel histone acetylation mark, which regulates chromatin structure and genome stability upon DNA damage. By performing a chromatin immunoprecipitation and deep sequencing assay, we identified the genome-wide distribution patterns of H1 lysine 85 acetylation in HCT116 cells. We found that H1K85ac largely bound intergenic regions (53%) and gene bodies (39%), whereas only 7% H1K85ac bound regions 2 kb upstream of the transcription start sites (TSSs). As the proportion of H1K85ac bound to potential promoter regions was not significantly different to that of the random peaks (~6%), these data suggest that H1K85ac may not be mainly involved in general transcriptional regulation.
2018-04-18 | GSE113238 | GEO
Project description:Drosophila dosage compensation is an epigenetic phenomenon in which the transcription of most genes on X-chromosome is enhanced by approximately two folds in males to equalize that in females. In this study, we provide evidence that transcriptional repressors, such as HP1 and linker histone H1, are globally reduced on male X chromosome. We further investigated the role of HP1 and linker H1 on X chromosome dosage compensation using flies with overexpression of HP1 and H1, we demonstrate that these repressors surpress H4K16 acetylation, presence of the elongating RNA Pol II and the transcription of the genes on male X chromosomes. To understand how H1 and HP1 are regulated on male X chromosome, we next explored the relationship between MOF and the two repressors of chromatin. We show that the hyperacetylation of H4K16 induced by MOF resulted in the loss of H1 and HP1 on chromatin and global chromatin decondensation. Our biochemical analysis further shows that the presence of acetylation on histone H4 at lysine 16 directly inhibits the interaction between histone H4 and linker H1. This study therefore provides novel clues on understanding the dynamic regulation of chromatin regulators on male X chromosome dosage compensation.
2017-11-01 | GSE29537 | GEO
Project description:Linker histone H1 plays a key role in chromatin organization and maintenance, however, our knowledge of the regulation of H1 functions by its posttranslational modifications (PTMs) is very limited. In this study, we report on the generation of homogeneously and site-specifically mono- and di-acetylated H1 (H1 Ac) using genetic code expansion. We used these modified histones to identify and comprehensively characterize the acetylation-dependent cellular interactome for linker histone H1 and show that site-specific acetylation results in overlapping, but distinct groups of interacting partners. Intriguingly, H1 acetylation-specific interactors comprise translational initiation factors and are involved in transcriptional regulation, suggesting that acetylation of H1 may indeed act as a regulator of the linker histone H1 by modulation of protein-protein interactions.
2021-07-09 | PXD025832 | Pride
Project description:Eukaryotic chromosomal DNA is assembled into regularly spaced nucleosomes, which play a central role in gene regulation by determining accessibility of control regions. The nucleosome contains ~147 bp of DNA wrapped ~1.7 times around a central core histone octamer. The linker histone, H1, binds both to the nucleosome, sealing the DNA coils, and to the linker DNA between nucleosomes, directing chromatin folding. Micrococcal nuclease (MNase) digests the linker to yield the chromatosome, containing H1 and ~160 bp, and then converts it to a core particle, containing ~147 bp and no H1. Sequencing of nucleosomal DNA obtained after MNase digestion (MNase-seq) generates genome-wide nucleosome maps that are important for understanding gene regulation. We present an improved MNase-seq method involving simultaneous digestion with exonuclease III, which removes linker DNA. Remarkably, we discovered two novel intermediate particles containing 154 or 161 bp, corresponding to 7 bp protruding from one or both sides of the nucleosome core. These particles are detected in yeast lacking H1 and in H1-depleted mouse chromatin. They can be reconstituted in vitro using purified core histones and DNA. We propose that these "proto-chromatosomes" are fundamental chromatin subunits, which include the H1 binding site and influence nucleosome spacing independently of H1.
2015-09-23 | GSE65889 | GEO
Project description:MNase analysis of linker histone H1 mutant
| PRJNA451507 | ENA
Project description:Transcriptiomic analysis of linker histone H1 mutant
| PRJNA451508 | ENA
Project description:At least six histone H1 variants exist in mammalian somatic cells that bind to the linker DNA and stabilize the nucleosome particle contributing to higher order chromatin compaction. In addition, H1 seems to be involved in the active regulation of gene expression. It is not well known whether the different variants have specific roles, are distributed differentially along the genome, or regulate specific promoters. By taking advantage of specific antibodies to H1 variants and HA-tagged recombinant H1 variants expressed in a breast cancer-derived cell line, we have investigated the distribution of the different somatic H1 variants (H1.2 to H1.5, H1.0 and H1X) in particular promoters and genome-wide. Genome-wide analysis of H1.0, H1.2, H1.4, H1X and H3
2014-02-04 | E-GEOD-49334 | biostudies-arrayexpress
Project description:H1 linker histones facilitate higher order chromatin folding and are essential for mammalian development. To achieve high resolution mapping of H1 variants H1d and H1c in embryonic stem cells (ESCs), we have established a knock-in system and shown that the N-terminally tagged H1 proteins are functionally interchangeable to their endogenous counterparts in vivo. H1d and H1c are depleted from GC- and gene-rich regions and active promoters, inversely correlated with H3K4me3, but positively correlated with H3K9me3 and associated with characteristic sequence features. Surprisingly, both H1d and H1c are significantly enriched at major satellites, which display increased nucleosome spacing compared with bulk chromatin. While also depleted at active promoters and enriched at major satellites, overexpressed H10 displays differential binding patterns in specific repetitive sequences compared with H1d and H1c. Depletion of H1c, H1d and H1e causes pericentric chromocenter clustering and de-repression of major satellites. These results integrate the localization of an understudied type of chromatin proteins, namely the H1 variants, into the epigenome map of mouse ESCs, and we identify significant changes at pericentric heterochromatin upon depletion of this epigenetic mark. Mapping linker histone H1 variants H1d, H1c and H10 as well as 3 core histone modifications in mouse ESC genome.
2013-04-29 | E-GEOD-46134 | biostudies-arrayexpress
Project description:Decoding the role of histone posttranslational modifications (PTMs) is key to understand the fundamental process of epigenetic regulation. While this process is well studied for core histones and many of their PTMs, this is not the case for linker histone H1 in general and its ubiquitylation in particular due to a lack of proper tools. Here, we report on the generation of site-specifically mono-ubiquitylated H1.2 via click chemistry and identify its ubiquitin-dependent interactome on a proteome-wide scale. We show that the H1 interactome is generally modulated by ubiquitylation and that site-specific ubiquitylation results in overlapping, but distinct interactomes. We further demonstrate that site-specific ubiquitylation of H1 affects the interaction with enzymes relevant for deubiquitylation and deacetylation. We finally show that site-specific ubiquitylation at position K64 impacts H1-dependent chromatosome assembly as well as H1-induced phase separation. In summary, we demonstrate that site-specific ubiquitylation is a general functional regulator for linker histone H1.
2021-07-20 | PXD020686 | Pride
Project description:Indicated cells were subjected to RNAi against linker histone H1, Nautilus (control), or GFP (control). RNA was isolated and subjected to Affymetrix GeneChIP Drosophila Genome 2.0 arrays RNA was compared from cells treated with RNAi against control (Nautilus in the case of salivary glands or GFP in the case of Kc cells) and linker histone H1. Kc cells were treated once with RNAi and RNA was collected 6 days later.
2013-04-22 | E-GEOD-44398 | biostudies-arrayexpress