Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

O-GlcNAc Transferase Promotes Eomesodermin-mediated Exhaustion of CD8+ Cytotoxic T Lymphocytes

ABSTRACT: Prolonged exposure to antigens drives CD8+ cytotoxic T lymphocytes (CTLs) to a hypofunctional state known as exhaustion, which compromises their ability to control infections and cancer. Here, we identify O-GlcNAcylation (O-GlcNAc)—a nutrient-sensitive post-translational modification—as a critical regulator for CTL exhaustion. Exhausted CTLs elevated nucleus O-GlcNAc levels, coupled with increased levels of the cellular uridine diphosphate GlcNAc (UDP-GlcNAc) relative to their effector counterparts. Using quantitative chemoenzymatic O-GlcNAcomic analysis, we identified a T-box transcription factor downstream of TCF-1-centered exhaustion transition and sustenance, eomesodermin (Eomes), which undergoes intensive O-GlcNAcylation. Mechanistically, mutation of the primary O-GlcNAc sites on Eomes abolished its glycosylation, but their phosphorylation and interactions with O-GlcNAc transferase (OGT) were unaffected. OGT/Eomes was indispensable for interaction with TCF-1. OGT stabilized Eomes and increased its accumulation in the nucleus, where T-bet-to-Eomes transcriptional transition drives functional exhaustion. These results uncover a novel regulatory relationship between OGT and the TCF-1/Eomes axis in promoting CTL exhaustion and impairing their protective function.

ORGANISM(S): Mus musculus

PROVIDER: GSE298788 | GEO | 2025/07/01

REPOSITORIES: GEO

ACCESS DATA

Json Xml

Dataset's files

Source:

			Action	DRS
		Other

Items per page:

1 - 1 of 1

Similar Datasets

TET2 and TET3 regulate GlcNAcylation and H3K4 methylation through OGT and SET1/COMPASS

Project description:TET proteins convert 5-methylcytosine to 5-hydroxymethylcytosine, an emerging dynamic epigenetic state of DNA that can influence transcription. Evidence has linked TET1 function to epigenetic repression complexes, yet mechanistic information, especially for the TET2 and TET3 proteins, remains limited. Here, we show a direct interaction of TET2 and TET3 with O-GlcNAc transferase (OGT). OGT does not appear to influence hmC activity, rather TET2 and TET3 promote OGT activity. TET2/3-OGT co-localize on chromatin at active promoters enriched for H3K4me3 and reduction of either TET2/3 or OGT activity results in a direct decrease in H3K4me3 and concomitant decreased transcription. Further, we show that Host Cell Factor 1 (HCF1), a component of the H3K4 methyltransferase SET1/COMPASS complex, is a specific GlcNAcylation target of TET2/3-OGT, and modification of HCF1 is important for the integrity of SET1/COMPASS. Additionally, we find both TET proteins and OGT activity promote binding of the SET1/COMPASS H3K4 methyltransferase, SETD1A, to chromatin. Finally, studies in Tet2 knockout mouse bone marrow tissue extend and support the data as decreases are observed of global GlcNAcylation and also of H3K4me3, notably at several key regulators of haematopoiesis. Together, our results unveil a step-wise model, involving TET-OGT interactions, promotion of GlcNAcylation, and influence on H3K4me3 via SET1/COMPASS, highlighting a novel means by which TETs may induce transcriptional activation. ChIP-Seq experiments were performed on Illumina HiScanSQ sequencer in wild-type HEK293T cells for H3K4me3 histone marks, O-GlcNAc and HCF1, for HT-TET2, HT-TET3 and HT-OGT in HEK293T cells overexpressing those three fusion proteins and in TET2 Kd HEK293T cells for H3K4me3 histone marks. ChIP-Seqs were also performed in mouse bone marrow tissues for H3K4me3 histone marks, O-GlcNAc, endogenous Tet2 and in Tet2 Ko bone marrow tissues for H3K4me3 histone marks.

2013-02-07 | E-GEOD-36620 | biostudies-arrayexpress

OGT, H2B S112GlcNAc, TET2 ChIP-seq results

Project description:TET2 directly interacts with OGT, which is important for the chromatin association of OGT in vivo. Although this specific interaction does not regulate the enzymatic activity of TET2, it facilitates OGT-dependent histone O-GlcNAcylation. Moreover, OGT associates with TET2 at transcription starting sites (TSS). Down-regulation of TET2 reduces the amount of H2B S112 GlcNAc marks in vivo, which are associated with gene transcription regulation. We found that OGT interacts with TET2 tightly. Using ChIP-seq with specific antibodies, we tested the co-localization of TET2 and OGT in genome level.

2012-12-11 | E-GEOD-41720 | biostudies-arrayexpress

Effect of O-GlcNAc transferase deficiency on intestinal epithelial cells in mice

Project description:O-GlcNAcylation is the modification of serine and threonine residues with beta-N-acetylglucosamine (O-GlcNAc) on intracellular proteins. To investigate the role of protein O-GlcNAcylation on intestinal homeostasis, we generated intestinal epithelial cell (IEC)-specific O-GlcNAc transferase (OGT) knockout in mice. The KO mice developed spontanous intestinal inflammation. To determine the underlying molecular mechanisms, we performed RNA sequencing of ileum and colon epithelial cells of wildtype and IEC-OGT KO mice.

2017-06-27 | GSE100473 | GEO

Dot1L recruits OGT target chromatin to regulate histones O-GlcNAcylation

Project description:OGT (O-GlcNAc transferase) is the distinctive enzyme responsible for catalyzing O-GlcNAc to the serine or threonine residues of thousands of cytoplasm and nuclear proteins that are involved in DNA damage, RNA splicing, and transcription preinitiation and initiation complex assembly. However, the molecular mechanism by OGT regulating gene transcription remains elusive. Using proximity labeling based mass spectrometry, we searched for functional partners of OGT and found that Dot1L, the conserved and unique histone methyltransferase mediated histone H3 lys79 methylation required for gene transcription, DNA damage repair, cell proliferation, and embryo development, interacts with OGT. Although this specific interaction does not regulate the enzymatic activity of Dot1L, it facilitates OGT-dependent histones O-GlcNAcylation. Moreover, OGT associates with Dot1L at transcription start sites, and depleting Dot1L decreased OGT associated with chromatin globally. Notably, downregulation of Dot1L reduces the levels of histone H2B S112 O-GlcNAcylation and histone H2B K120 ubiquitination in vivo, which are associated with gene transcription regulation. Taken together, these results reveal a Dot1L-dependent O-GlcNAcylation of chromatin.

2022-04-06 | GSE200059 | GEO

Expression data from ES cells

Project description:TET2 directly interacts with OGT, which is important for the chromatin association of OGT in vivo. Although this specific interaction does not regulate the enzymatic activity of TET2, it facilitates OGT-dependent histone O-GlcNAcylation. Moreover, OGT associates with TET2 at transcription starting sites (TSS). Down-regulation of TET2 reduces the amount of H2B S112 GlcNAc marks in vivo, which are associated with gene transcription regulation. We used microarray to test the function of TET2 on gene expression. Mouse ES cells infected with control knockdown(KD) or TET2 KD virus were treated with puromycin. ES cells were extracted for RNA and hybridization on Affymetrix microarrays.

2012-12-11 | E-GEOD-41721 | biostudies-arrayexpress

FBXO31-mediated Ubiquitination of OGT Maintains O-GlcNAcylation Homeostasis to Restrain Endometrial Malignancy

Project description:CRISPR screen and biochemical characterization reveal that tumor suppressor F-box only protein 31 (FBXO31) regulates O-GlcNAcylation homeostasis in EC by ubiquitinating the O-GlcNAc transferase OGT.

2025-01-23 | GSE287788 | GEO

OGT, H2B S112GlcNAc, TET2 ChIP-seq results

2012-12-11 | GSE41720 | GEO

Expression from C. elegans L1 animals

Project description:Nutrient-driven O-GlcNAcylation of key components of the transcription machinery may epigenetically modulate gene expression in metazoans. Knockouts of the O-GlcNAc cycling enzymes in C. elegans are viable and fertile, allowing a global analysis of the impact of GlcNAcylation. Here we compare gene expression in wild type and O-GlcNAc mutants (ogt-1 and oga-1) in synchronized, fed L1 animals. Whole genome transcriptional profiling of the O-GlcNAc cycling mutants confirmed dramatic deregulation of genes in these key pathways. As predicted, the O-GlcNAc cycling mutants show phenotypically altered lifespan and susceptibility to UV stress.

2018-06-04 | GSE40371 | GEO

Tumor-associated macrophages expressing the transcription factor IRF8 promote T cell exhaustion in cancer

Project description:Tumor progression is associated with overstimulation of cytotoxic T lymphocytes (CTLs), resulting in a dysfunctional state of exhaustion. However, the identity of antigen-presenting cells that drive CTL exhaustion is poorly defined. Here we show that tumor-associated macrophages (TAMs) expressing the transcription factor interferon regulatory factor-8 (IRF8) promote CTL exhaustion in a murine model of breast cancer. While CTL priming in tumor-draining lymph nodes was enabled by IRF8-dependent type 1 dendritic cells, CTL exhaustion in tumor required TAM expression of IRF8 that supported the cancer cell antigen-presenting function of TAMs. Macrophage-specific ablation of IRF8 reversed exhaustion of cancer cell antigen-reactive CTLs, and suppressed tumor growth. Analysis of the immune-infiltrated human renal cell carcinoma tumors revealed abundant TAMs that expressed IRF8 and were enriched for an IRF8 gene expression signature. Furthermore, the TAM-IRF8 signature co-segregated with CTL exhaustion signatures across multiple cancer types. Thus, CTL exhaustion is promoted by TAMs via IRF8.

2022-09-06 | GSE212643 | GEO

Ogt Controls Adult Neurogenesis through Modulating Notch Signaling Activity in Mice

Project description:Ogt catalyzed O-linked N-acetylglucosamine (O-GlcNAcylation, O-GlcNAc) plays an important function in diverse biological processes and diseases. However, the roles of Ogt in regulating neurogenesis remain largely unknown. Here, we show that Ogt deficiency or depletion in adult neural stem cells (aNSCs) leads to the diminishment of aNSCs pool and the aberrant neurogenesis, and consequently impairs cognitive function of adult mice. RNA sequencing reveals that Ogt deficiency alters the transcription of genes relating to cell cycle, neurogenesis, and neuronal development. Mechanistic studies show that Ogt directly interacts with Notch1 and catalyzes the O-GlcNAc modification of Notch TM/ICD fragment. The decreased O-GlcNAc modification of TM/ICD increases the binding of E3 ubiquitin ligase Itch to TM/ICD and promotes its degradation. Itch knockdown rescues neurogenic defects in Ogt-deficient mice. OGT also regulates human cortical neurogenesis in forebrain organoids derived from induced pluripotent stem cells. Our findings reveal the essential roles and mechanisms of Ogt and O-GlcNAc modification in regulating mammalian neurogenesis and cognition.

2020-12-15 | GSE163141 | 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