Nitric oxide regulates gene expression in cancers by controlling histone posttranslational modifications [miRNA-4_0]
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ABSTRACT:
ORGANISM(S): synthetic construct Homo sapiens
PROVIDER: GSE66323 | GEO | 2015/11/05
SECONDARY ACCESSION(S): PRJNA276550
REPOSITORIES: GEO
Similar Datasets
Project description:Dynamic changes in histone posttranslational modifications (PTMs) are important regulators of chromatin structure and gene transcription in both normal and disease settings. Herein, we describe a novel signaling mechanism of nitric oxide (•NO) by demonstrating its ability to modulate gene expression via alteration of histone PTMs. Having established that •NO exposure induced differential expression of approximately 6500 genes, we set out to determine if there was an epigenetic component to their regulation. •NO exposure led to alterations in the global levels of acetyl and methyl modifications at numerous lysine residues on core histones H3 and H4. Residues H3K9me2/ac were examined further and determined to have differential distribution at various loci throughout the genome in response to •NO. Changes in the enrichment levels of H3K9me2/ac at specific genes correlated with changes in the expression levels of their transcripts. Molecular mechanisms contributing to phenotypic outcomes in •NO-associated cancers remain to be well understood since traditional modes of •NO-signaling do not explain a large proportion of its impact on tumor cell behavior. Our results reveal that •NO drives a significant amount of gene expression changes epigenetically by changing the distribution of numerous histone marks.
2015-11-05 | GSE66322 | GEO
Project description:Dynamic changes in histone posttranslational modifications (PTMs) are important regulators of chromatin structure and gene transcription in both normal and disease settings. Herein, we describe a novel signaling mechanism of nitric oxide (•NO) by demonstrating its ability to modulate gene expression via alteration of histone PTMs. Having established that •NO exposure induced differential expression of approximately 6500 genes, we set out to determine if there was an epigenetic component to their regulation. •NO exposure led to alterations in the global levels of acetyl and methyl modifications at numerous lysine residues on core histones H3 and H4. Residues H3K9me2/ac were examined further and determined to have differential distribution at various loci throughout the genome in response to •NO. Changes in the enrichment levels of H3K9me2/ac at specific genes correlated with changes in the expression levels of their transcripts. Molecular mechanisms contributing to phenotypic outcomes in •NO-associated cancers remain to be well understood since traditional modes of •NO-signaling do not explain a large proportion of its impact on tumor cell behavior. Our results reveal that •NO drives a significant amount of gene expression changes epigenetically by changing the distribution of numerous histone marks.
2015-11-05 | GSE66318 | GEO
Project description:Dynamic changes in histone posttranslational modifications (PTMs) are important regulators of chromatin structure and gene transcription in both normal and disease settings. Herein, we describe a novel signaling mechanism of nitric oxide (â¢NO) by demonstrating its ability to modulate gene expression via alteration of histone PTMs. Having established that â¢NO exposure induced differential expression of approximately 6500 genes, we set out to determine if there was an epigenetic component to their regulation. â¢NO exposure led to alterations in the global levels of acetyl and methyl modifications at numerous lysine residues on core histones H3 and H4. Residues H3K9me2/ac were examined further and determined to have differential distribution at various loci throughout the genome in response to â¢NO. Changes in the enrichment levels of H3K9me2/ac at specific genes correlated with changes in the expression levels of their transcripts. Molecular mechanisms contributing to phenotypic outcomes in â¢NO-associated cancers remain to be well understood since traditional modes of â¢NO-signaling do not explain a large proportion of its impact on tumor cell behavior. Our results reveal that â¢NO drives a significant amount of gene expression changes epigenetically by changing the distribution of numerous histone marks. Cultured cells were treated with 500uM DETA/NO to examine the effects of a physiologically relevant â¢NO concentration on differential distribution of H3K9ac/H3K9me2. A total of two untreated biological replicates and two â¢NO-treated biological replicates were harvested. The untreated samples served as control against which comparisons were made to elucidate â¢NO-mediated changes in the histone landscape.
2015-11-05 | E-GEOD-66318 | biostudies-arrayexpress
Project description:Dynamic changes in histone posttranslational modifications (PTMs) are important regulators of chromatin structure and gene transcription in both normal and disease settings. Herein, we describe a novel signaling mechanism of nitric oxide (â?¢NO) by demonstrating its ability to modulate gene expression via alteration of histone PTMs. Having established that â?¢NO exposure induced differential expression of approximately 6500 genes, we set out to determine if there was an epigenetic component to their regulation. â?¢NO exposure led to alterations in the global levels of acetyl and methyl modifications at numerous lysine residues on core histones H3 and H4. Residues H3K9me2/ac were examined further and determined to have differential distribution at various loci throughout the genome in response to â?¢NO. Changes in the enrichment levels of H3K9me2/ac at specific genes correlated with changes in the expression levels of their transcripts. Molecular mechanisms contributing to phenotypic outcomes in â?¢NO-associated cancers remain to be well understood since traditional modes of â?¢NO-signaling do not explain a large proportion of its impact on tumor cell behavior. Our results reveal that â?¢NO drives a significant amount of gene expression changes epigenetically by changing the distribution of numerous histone marks. Cultured cells were treated with 500uM DETA/NO to examine the effects of a physiologically relevant â?¢NO concentration on gene expression. A total of two untreated biological replicates and two â?¢NO-treated biological replicates were harvested. The untreated samples served as control against which comparisons were made to elucidate â?¢NO-mediated changes in the gene expression.
2015-11-05 | E-GEOD-66322 | biostudies-arrayexpress
Project description:Histone post-translational modifications (PTMs) are an important part of chromatin signaling mechanisms. Among them, histone H3 has a prominent role, and combinations of multiple PTMs are common. We investigated binding of multiple marks on the same H3 histone by the human UHRF1-TTD (Uniprot Q96T88, residues 126-280), known to bind H3K9me2/3 histones. We verified binding to H3K9me2/3 and demonstrated stronger binding to synthetic H3 peptides containing K4me1 and K9me2/3 as well as native HepG2 mononucleosomes bearing both H3K9me2/3 and H3K4me1.
2023-08-11 | GSE213741 | GEO
Project description:Introduction: Autoreactivity to histones is a pervasive feature of several human autoimmune disorders including systemic lupus erythematosus (SLE). Specific post-translational modifications (PTMs) of histones within neutrophil extracellular traps (NETs) may potentially drive the process by which tolerance to these chromatin-associated proteins is broken. We hypothesized that NETs and their unique histone PTMs might be capable of inducing autoantibodies that target histones. Methods: We developed a novel and efficient method for the in vitro production, visualization, and broad profiling of histone-PTMs of human and murine NETs. We also immunized Balb/c mice with murine NETs and profiled their sera on autoantigen and histone peptide microarrays for evidence of autoantibody production to their immunogen. Results: We confirmed specificity toward acetyl-modified histone H2B as well as to other histone PTMs in sera from patients with SLE known to have autoreactivity against histones. We observed enrichment for distinctive histone marks of transcriptionally silent DNA during NETosis triggered by diverse stimuli. However, NETs derived from human and murine sources did not harbor many of the PTMs toward which autoreactivity was observed in patients with SLE or in MRL/lpr mice. Further, while murine NETs were weak autoantigens in vivo, there was only partial overlap in the IgG and IgM autoantibody profiles induced by vaccination of mice with NETs and those seen in patients with SLE. Conclusions: Isolated in vivo exposure to NETs is insufficient to break tolerance and may involve additional factors that have yet to be identified.
2012-01-26 | GSE32543 | GEO
Project description:Both genetic and environmental factors are implicated in Type 1 Diabetes (T1D). Since environmental factors can trigger epigenetic changes, we hypothesized that variations in histone posttranslational modifications (PTMs) at the promoter/enhancer regions of T1D susceptible genes may be associated with T1D. We therefore evaluated histone PTM variations at known T1D susceptible genes in blood cells from T1D patients versus healthy non-diabetic controls, and explored their connections to T1D. We used the chromatin-immunoprecipitation-linked-to-microarray approach to profile key histone PTMs, including H3-lysine-4 trimethylation (H3K4me3), H3K27me3, H3K9me3, H3K9 acetylation (H3K9Ac) and H4K16Ac at genes within the T1D susceptible loci in lymphocytes, and H3K4me3, H3K9me2, H3K9Ac and H4K16Ac at the IDDM1 region in monocytes of T1D patients and healthy controls separately. We screened for potential variations in histone PTMs using computational methods to compare datasets from T1D and controls. Interestingly, we observed marked variations in H3K9Ac levels at the upstream regions of HLA-DRB1 and HLA-DQB1 within the IDDM1 locus in T1D monocytes relative to controls. Additional experiments with THP-1 monocytes demonstrated increased expression of HLA-DRB1 and HLA-DQB1 in response to interferon- and TNF-treatment that were accompanied by changes in H3K9Ac at the same promoter regions as that seen in the patient monocytes. These results suggest that the H3K9Ac status of HLA-DRB1 and HLA-DQB1, two genes highly associated with T1D, may be relevant to their regulation and transcriptional response towards external stimuli. Thus, the promoter/enhancer architecture and chromatin status of key susceptible loci could be important determinants in their functional association to T1D susceptibility. We used ChIP-chip to profile key histone PTMs, including H3K4me3, H3K9me2, H3K9Ac and H4K16Ac, at the IDDM1 region in monocytes of T1D patients and healthy controls.
2012-05-31 | E-GEOD-36397 | biostudies-arrayexpress
Project description:Introduction: Autoreactivity to histones is a pervasive feature of several human autoimmune disorders including systemic lupus erythematosus (SLE). Specific post-translational modifications (PTMs) of histones within neutrophil extracellular traps (NETs) may potentially drive the process by which tolerance to these chromatin-associated proteins is broken. We hypothesized that NETs and their unique histone PTMs might be capable of inducing autoantibodies that target histones. Methods: We developed a novel and efficient method for the in vitro production, visualization, and broad profiling of histone-PTMs of human and murine NETs. We also immunized Balb/c mice with murine NETs and profiled their sera on autoantigen and histone peptide microarrays for evidence of autoantibody production to their immunogen. Results: We confirmed specificity toward acetyl-modified histone H2B as well as to other histone PTMs in sera from patients with SLE known to have autoreactivity against histones. We observed enrichment for distinctive histone marks of transcriptionally silent DNA during NETosis triggered by diverse stimuli. However, NETs derived from human and murine sources did not harbor many of the PTMs toward which autoreactivity was observed in patients with SLE or in MRL/lpr mice. Further, while murine NETs were weak autoantigens in vivo, there was only partial overlap in the IgG and IgM autoantibody profiles induced by vaccination of mice with NETs and those seen in patients with SLE. Conclusions: Isolated in vivo exposure to NETs is insufficient to break tolerance and may involve additional factors that have yet to be identified. Serum samples from 20 systemic lupus erythematosis patients were run on the Human Epigenome Microarray Platform V1.0 (HEMP; a single-color platform), in order to profile their autoantibodies against a library of post-translationally modified histone peptides. These 20 samples were randomly selected from a larger cohort previously profiled (data not shown) on the Utz Lab Whole Protein Autoantigen Array V2.0 (a single-color platform), where 14 were histone-reactive and 6 were histone-nonreactive. Control sera from 9 healthy adults and a positive control comprising a mixture of autoimmune sera with defined reactivities, were also run on HEMP V1.0. Together, these samples comprise the data appearing in Figures 1 and S1 (IgG and IgM isotype reactivity profiles, respectively), identifying IgG reactivity to 9 peptides that significantly distinguish histone-reactive from -nonreactive sera among 96 peptides profiled. For data appearing in Figure 5, serum samples from a total of 6 Balb/c mice, consisting of two treatment groups, NETs (Neutrophil Extracellular Traps) and NETs + CRAMP (cathelicidin-related antimicrobial peptide) were collected monthly over a 3-month period, along with a zero time point. These samples were compared with a positive control consisting of serum collected from a MLR/lpr mice exhibiting lupus-like symptoms, and a negative control with no serum. The 0, 1 and 2 month time points were profiled on the Utz Lab Whole Protein Autoantigen Array V2.0 and are shown in Figure 5A-B, while the 1 and 3 month time points were profiled on HEMP V1.0 arrays and shown in Figure 5E. All samples were run once with no replicates.
2012-01-26 | E-GEOD-32543 | biostudies-arrayexpress
Project description:How histone posttranslational modifications (PTMs) are inherited through cell cycle remains poorly understood. Canonical histones are made in the S phase of cell cycle. Combining mass spectrometry-based technologies and stable isotope labeling by amino acids in cell culture (SILAC), we interrogate the distributions of multiple major histone PTMs on old versus new histones in synchronized human cells. We show that histone PTMs can be grouped to three categories accordingly to their distributions. Most lysine mono-methylation and acetylation PTMs are either symmetrically distributed on old and new histones, or asymmetric on new histones. In contrast, most di- and tri-methylation PTMs are asymmetric on old histones, suggesting the inheritance of different PTMs is regulated distinctly. Intriguingly, old and new histones are distinguished in their phosphorylation status during early mitosis, in three different human cell types: Hela, 293T and human foreskin fibroblast (HFF) cells. The mitotic hallmark H3S10ph is predominantly associated with old H3 at early mitosis and become symmetric with the progression of mitosis. The same distribution pattern is found on other mitotic histone phosphorylation marks, including H3T3/T6ph, H3.1/2S28ph and H1.4S26ph, excluding S28/S31ph on the H3 variant H3.3. Although H3S10ph often associates with the neighboring K9 di- or tri-methylation, they are not required for the asymmetric distribution of S10ph on the same H3 tail. Inhibition of the kinase Aurora B does not change the distribution pattern despite significant reduction of H3S10ph levels. K9me2 abundance on the new H3 is significantly reduced after Aurora B inhibition, suggesting a crosstalk between H3S10ph and H3K9me2.
2016-06-01 | PXD003709 | Pride
Project description:Histone H3 lysine 9 dimethylation (H3K9me2) is a highly conserved silencing epigenetic mark. Chromatin marked with H3K9me2 forms large domains in mammalian cells and overlaps well with lamina-associated domains and the B compartment defined by Hi-C. However, the role of H3K9me2 in 3-dimensional (3D) genome organization remains unclear. We investigated genome-wide H3K9me2 distribution, transcriptome, and 3D genome organization in mouse embryonic stem cells following the inhibition or depletion of five H3K9 methyltransferases (MTases): G9a, GLP, SETDB1, SUV39H1, and SUV39H2. H3K9me2 was regulated by all five MTases; however, H3K9me2 and transcription in the A and B compartments were regulated by different MTases. H3K9me2 in A compartments was primarily regulated by G9a/GLP and SETDB1, while H3K9me2 in the B compartments was regulated by all five MTases. Furthermore, decreased H3K9me2 correlated with changes to the more active compartmental state that accompanied transcriptional activation.
2021-08-05 | PXD024756 | Pride