Browse
Submit Data
Databases
API
Help

Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

A Novel HDAC Complex in the Control of Transcription and Genome Stability

ABSTRACT: The acetylation state of histones, controlled by histone acetyltransferases and deacetylases, profoundly affects DNA transcription and repair by modulating chromatin accessibility to the cellular machinery. The Schizosaccharomyces pombe HDAC Clr6 (human HDAC1) binds to different sets of proteins that define functionally distinct complexes: I, IM-bM-^@M-^Y and II. Here we determine the composition, architecture and functions of a new Clr6 HDAC complex, I'', delineated by the novel proteins Nts1, Mug165 and Png3. Deletion of nts1 causes increased sensitivity to genotoxins and deregulated expression of Tf2 elements, long non-coding RNA, subtelomeric and stress-related genes. Similar, but more pervasive, phenotypes are observed upon Clr6 inactivation, supporting the designation of complex I'' as a mediator of a key subset of Clr6 functions. We also reveal that with the exception of Tf2 elements, Clr6 I''-regulated loci and its genome-wide loading sites do not correlate. Instead, Nts1 loads at genes that are expressed in mid-meiosis, following oxidative stress, or are periodically expressed. Collective data suggest that Clr6 I'' has (i) indirect effects on gene expression, conceivably by mediating higher-order chromatin organization of sub-telomeres and Tf2 elements, and (ii) direct effects on the transcription of specific genes in response to certain cellular or environmental stimuli. Identification of the genome binindg sites for Nts1 (SPCC24B10.19C) in Schizosaccharomyces pombe

ORGANISM(S): Schizosaccharomyces pombe

SUBMITTER: Nicola Zilio

PROVIDER: E-GEOD-57040 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

ACCESS DATA

Json Xml

Similar Datasets

GRO-seq from HCT116 cells

Project description:The majority of transcription studies examine steady-state RNA . However steady-state RNA is not a true reflection of the transcriptome, because the RNA levels are affected by both transcription rate and degradation rate. In this experiment we measured the amount of transcription occurring in HCT116 colon cancer cells, regardless of degradation, using GRO-seq (global nuclear run-on sequencing). This information demonstrates that many genes have a pile-up of transcriptionally-engaged polymerase near their 5'-end. Nuclei were prepared from HCT116 cells (treated for 1hr with DMSO as control for additional GRO-seq experiments to be reported separately). Transcription run-on was performed (as per Core, L.J., Waterfall, J.J., and Lis, J.T. (2008). Nascent RNA sequencing reveals widespread pausing and divergent initiation at human promoters. Science 322, 1845-1848) and nascent RNAs were purified and sequenced.

2013-03-01 | E-GEOD-38140 | biostudies-arrayexpress

Epigenetic conservation at gene regulatory elements revealed by non-methylated DNA profiling in seven vertebrates

Project description:Two-thirds of gene promoters in mammals are associated with regions of non-methylated DNA, called CpG islands (CGIs), which counteract the repressive effects of DNA methylation. In lower vertebrates, computational CGI predictions often reside away from gene promoters, suggesting a major divergence in gene promoter architecture across vertebrates. By experimentally identifying non-methylated DNA in the genomes of seven diverse vertebrates, we instead reveal that non-methylated islands (NMIs) of DNA are a central feature of vertebrate gene promoters. Furthermore, NMIs are present at orthologous genes across vast evolutionary distances, revealing a surprising level of conservation in this epigenetic feature. By profiling NMIs in different tissues and developmental stages we uncover a unifying set of features that are central to the function of NMIs in vertebrates. Together these findings demonstrate an ancient logic for NMI usage at gene promoters and reveal an unprecedented level of epigenetic conservation across vertebrate evolution. Bio-CAP was used to identify non-methylated regions of the genome in seven diverse vertebrates (human, mouse, platypus, chicken, lizard, frog and zebrafish) across a number of tissues.

2013-01-22 | E-GEOD-43512 | biostudies-arrayexpress

Expression profiling in alp13 deletion, clr6-1 mutant and pst1-1 mutant, versus WT S. pombe cells.

Project description:Expression analyses in alp13 deletion (Clr6-complex II mutant), clr6-1 partial mutant (Clr6 complexes I and II mutant) and pst1-1 partial mutant (Clr6-complex I mutant) S.pombe cells. Keywords: Expression

2007-04-23 | GSE7252 | GEO

Selective transcriptional regulation by Myc in cellular growth control and lymphomagenesis [DNAse-Seq]

Project description:The c-myc proto-oncogene product, Myc, is a transcription factor that binds thousands of genomic loci. Recent work suggested that rather than up- and down-regulating selected groups of genes, Myc targets all active promoters and enhancers in the genome (a phenomenon termed "invasion") and acts as a general amplifier of transcription. However, the available data did not readily discriminate between direct and indirect effects of Myc on RNA biogenesis. We addressed this issue with genome-wide chromatin immunoprecipitation and RNA expression profiles during B-cell lymphomagenesis in mice, in cultured B-cells and fibroblasts. Consistent with long-standing observations, we detected general increases in total RNA or mRNA copies per cell (hereby termed "amplification") when comparing actively proliferating cells with control quiescent cells: this was true whether cells were stimulated by mitogens (requiring endogenous Myc for a proliferative response) or by deregulated, oncogenic Myc activity. RNA amplification and promoter/enhancer invasion by Myc were separable phenomena that could occur without one another. Moreover, whether or not associated with RNA amplification, Myc drove the differential expression of distinct subsets of target genes. Hence, while having the potential to interact with all active/poised regulatory elements in the genome, Myc does not directly act as a global transcriptional amplifier. Instead, our results imply that Myc activates and represses transcription of discrete gene sets, leading to changes in cellular state that can in turn feed back on global RNA production and turnover. Mapping Dnase hypersensitive sites in MycER fibroblasts.

2014-07-07 | E-GEOD-50823 | biostudies-arrayexpress

Genome-wide binding analysis of GATA1fl and GATA1s in G1ME cells.

Project description:We used chromatin immunoprecipitation sequencing (ChIP-seq) to compare genome-wide binding profiles of GATA1fl and GATA1s in G1ME cells, which are immortalized, developmentally arrested megakaryocyte-erythroid progenitors (MEPs) derived from in vitro differentiation of murine Gata1- ES cells. Although the truncation in GATA1s leaves the DNA binding domain intact, GATA1s fails to broadly occupy erythroid specific regulatory regions. These observations point to lineage specific co-factor associations essential for normal chromatin occupancy and provide mechanistic insights into how GATA1s mutations cause human disease. We performed ChIP-seq on G1ME cells 42 hours after retroviral transfer of HA-tagged full-length GATA1 (GATA1fl) or GATA1s cDNAs (2 replicates each). At this time point, there was no apparent difference in the cell surface phenotypes between GATA1fl and GATA1s-expressing cells. For each ChIP-seq replicate we obtained a matching input sample (non-ChIP DNA) as a control.

2015-01-26 | E-GEOD-61932 | biostudies-arrayexpress

Single cell RNA sequencing of putative AIRE+ dendritic cells from human paediatric tonsillitis

Project description:Characterisation and identification of putative human extra-thymic AIRE-expressing cells from paediatric tonsillitis samples using single -cell transcriptome profiling.

2019-01-14 | E-MTAB-7381 | biostudies-arrayexpress

Single-cell profiling of developing mouse adipocyte progenitor cells

Project description:Considerable heterogeneity exists amongst adipose progenitor cells derived from primary visceral white adipose tissue depots. Single cell RNA sequencing, and state of the art analyses, have the power to disentangle this heterogeneity and reveal the underlying development processes that drive adipocyte maturation.

2021-10-02 | E-MTAB-6913 | biostudies-arrayexpress

Selective transcriptional regulation by Myc in cellular growth control and lymphomagenesis [RNA-Seq]

Project description:The c-myc proto-oncogene product, Myc, is a transcription factor that binds thousands of genomic loci. Recent work suggested that rather than up- and down-regulating selected groups of genes, Myc targets all active promoters and enhancers in the genome (a phenomenon termed "invasion") and acts as a general amplifier of transcription. However, the available data did not readily discriminate between direct and indirect effects of Myc on RNA biogenesis. We addressed this issue with genome-wide chromatin immunoprecipitation and RNA expression profiles during B-cell lymphomagenesis in mice, in cultured B-cells and fibroblasts. Consistent with long-standing observations, we detected general increases in total RNA or mRNA copies per cell (hereby termed "amplification") when comparing actively proliferating cells with control quiescent cells: this was true whether cells were stimulated by mitogens (requiring endogenous Myc for a proliferative response) or by deregulated, oncogenic Myc activity. RNA amplification and promoter/enhancer invasion by Myc were separable phenomena that could occur without one another. Moreover, whether or not associated with RNA amplification, Myc drove the differential expression of distinct subsets of target genes. Hence, while having the potential to interact with all active/poised regulatory elements in the genome, Myc does not directly act as a global transcriptional amplifier. Instead, our results imply that Myc activates and represses transcription of discrete gene sets, leading to changes in cellular state that can in turn feed back on global RNA production and turnover. Total RNA profiling of gene expression upon Myc regulation in two different cell types by Illumina sequencing

2014-07-07 | E-GEOD-51008 | biostudies-arrayexpress

Dual RNA-sequencing of nontypeable Haemophilus influenzae and host cell transcriptomes reveals new aspects of host-pathogen interface

Project description:Characterization of host-pathogen interactions is critical for the development of next-generation therapies and vaccines. Classical approaches involve the use of transformed cell lines and/or animal models which may not reflect the complexity and response of the human host. We reconstituted the ciliated human bronchial epithelium in vitro using primary bronchial epithelial cells to simultaneously monitor the infection-linked global changes in nontypeable Haemophilus influenzae (NTHi) and infected host epithelia gene expression by dual RNA-seq. Acquisition of a total of nearly 2,5 billion sequences allowed construction of high-resolution strand-specific transcriptome maps of NTHi during infection of host mucosal surface and monitoring of metabolic as well as stress-induced host-adaptation strategies of this pathogen. As a part of our screening, we identified a global profile of noncoding transcripts that are candidate small RNAs regulated during human host infection in Haemophilus species. Temporal analysis of host mRNA signatures revealed significant dysregulation of target cell cytoskeleton elicited by bacterial infection, with a profound effect on intermediate filament network of bronchial epithelium. Our data provide a robust and comprehensive catalogue of regulatory responses that drive NTHi pathogenesis and gives novel insights into complex crosstalk between the host and the invading pathogen. Primary human bronchial epithelium was infected with NTHi at a multiplicity of 100:1. Total RNA was isolated at 1, 6, 24 and 72 h post-infection in three biologically-independent experiments and cDNA libraries were prepared and sequenced with Illumina HiSeq 2500 sequencer. At each time point, between 60 and 180 million total reads per sample were obtained of which approximately one-third could be aligned to non-rRNA regions of the bacterial and human genomes

2015-11-02 | E-GEOD-63900 | biostudies-arrayexpress

ChIP-chip analyses of H3K9 methylation in alp13 deletion and clr6-1 mutant S.pombe cells.

Project description:ChIP-chip analyses of H3K9 methylation in alp13 deletion (Clr6-complex II) and clr6-1 mutant (complexes -I and -II) S.pombe cells. Keywords: ChIP-chip

2007-04-23 | GSE7113 | GEO

OmicsDI is part of the ELIXIR infrastructure

OmicsDI is an Elixir interoperability service. Learn more ›

Tweets

OmicsDI Databases

PRIDE
PeptideAtlas
MassIVE
JPOST Repository
Physiome Model Repository

EGA
EVA
ENA
LINCS
PAXDB
Cell Collective

MetaboLights
Metabolomics Workbench
MetabolomeExpress
GNPS
BioModels
FAIRDOMHub

ArrayExpress
dbGaP
ExpressionAtlas
GEO
NODE

Information

Databases
Help
API
Contact us
Code on GitHub
Terms of use
Submit Data