Dynamic O-GlcNAc cycling at promoters of C. elegans genes regulating Longevity, Stress, and Immunity
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ABSTRACT:
OTHER RELATED OMICS DATASETS IN: GSE18132
PROVIDER: PRJNA119415 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:Nutrient-driven O-GlcNAcylation of key components of the transcription machinery may epigenetically modulate gene expression in metazoans. The global effects of GlcNAcylation on transcription can be addressed directly in C. elegans because knockouts of the O-GlcNAc cycling enzymes are viable and fertile. Using anti-O-GlcNAc ChIP-on-chip whole-genome tiling arrays on wild-type and mutant strains, we detected over 800 promoters where O-GlcNAc cycling occurs, including microRNA loci and multigene operons. Intriguingly, O-GlcNAc-marked promoters are biased toward genes associated with PIP3 signaling, hexosamine biosynthesis, and lipid/carbohydrate metabolism. These marked genes are linked to insulin-like signaling, metabolism, aging, stress, and pathogen-response pathways in C. elegans. 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 altered lifespan and UV stress susceptibility phenotypes. We propose that O-GlcNAc cycling at promoters participates in a molecular program impacting nutrient-responsive pathways in C. elegans, including stress, pathogen response, and adult lifespan. The observed impact of O-GlcNAc cycling on both signaling and transcription in C. elegans has important implications for human diseases of aging, including diabetes and neurodegeneration.
| S-EPMC2867743 | biostudies-literature
Project description:This SuperSeries is composed of the SubSeries listed below.
2010-01-01 | GSE18132 | GEO
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. Whole genome ChIP profiling of the O-GlcNAc cycling mutants identified over 800 genes associated with GlcNAcylated chromatin. This novel chromatin mark is preferentially found with genes involved in stress, longevity, and innate immunity, the same set of processes affected by global changes in gene expression analysis. This experiment collected data on fed animals (3 hours) for comparisons to previoulsy collected starved data to see what acute effects nutritional flux would have on either O-GlcNAc chromatin marks or RNA Pol II distributions.
2010-01-01 | GSE18611 | GEO
Project description:Discriminating pathogenic bacteria from energy-harvesting commensals is key to host immunity. Using mutants defective in the enzymes of O-linked N-acetylglucosamine (O-GlcNAc) cycling, we examined the role of this nutrient-sensing pathway in the Caenorhabidits elegans innate immune response. Using whole genome transcriptional profiling, O-GlcNAc cycling mutants exhibited deregulation of unique stress- and immune-responsive genes as well as genes shared with the p38 MAPK/PMK-1 pathway. Moreover, genetic analysis showed that deletion of O-GlcNAc transferase (ogt-1) yielded animals hypersensitive to the human pathogen S. aureus but not to P. aeruginosa. Genetic interaction studies further revealed that nutrient-responsive OGT-1 acts through the conserved ß-catenin (BAR-1) pathway and in concert with p38 MAPK/PMK-1 to modulate the immune response to S. aureus. The participation of the nutrient sensor O-GlcNAc transferase in an immunity module conserved from C. elegans to humans reveals an unexplored nexus between nutrient availability and a pathogen-specific immune response.
2015-05-01 | GSE53732 | GEO
Project description:Discriminating pathogenic bacteria from energy-harvesting commensals is key to host immunity. Using mutants defective in the enzymes of O-linked N-acetylglucosamine (O-GlcNAc) cycling, we examined the role of this nutrient-sensing pathway in the Caenorhabidits elegans innate immune response. Using whole genome transcriptional profiling, O-GlcNAc cycling mutants exhibited deregulation of unique stress- and immune-responsive genes as well as genes shared with the p38 MAPK/PMK-1 pathway. Moreover, genetic analysis showed that deletion of O-GlcNAc transferase (ogt-1) yielded animals hypersensitive to the human pathogen S. aureus but not to P. aeruginosa. Genetic interaction studies further revealed that nutrient-responsive OGT-1 acts through the conserved ß-catenin (BAR-1) pathway and in concert with p38 MAPK/PMK-1 to modulate the immune response to S. aureus. The participation of the nutrient sensor O-GlcNAc transferase in an immunity module conserved from C. elegans to humans reveals an unexplored nexus between nutrient availability and a pathogen-specific immune response. In C. elegans, three mutant strains(genotypes used: N2 (wild-type), ogt-1 (ok1474), oga-1 (ok1207), and pmk-1 (km25)) were treated with the human pathogen S. aureus (SA) or P. aeruginosa(PA) and OP50 (E. coli control) with three biological replications.
2015-05-01 | E-GEOD-53732 | biostudies-arrayexpress
Project description:O-linked N-acetylglucosamine (O-GlcNAc) is a necessary protein modification installed onto hundreds of nucleocytoplasmic proteins by O-GlcNAc transferase (OGT). Recently, we developed an antibody-free metabolic feeding approach that enables unbiased mapping of O-GlcNAcylated proteins in a genome-wide manner, providing insight into the regulation of genes by O-GlcNAcylated proteins within Drosophila. Here we apply this O-GlcNAc chemical mapping strategy to a time course (TC) feeding experiment within Drosophila larvae, generated the first ever TC ChIP-seq experiment performed on both a protein modification and within a living organism. TC metabolic labeling experiments were performed in wild-type and O-GlcNAc hydrolase (OGA) deficient Drosophila. Analysis of the resulting sequencing data revealed that a loss of OGA causes a global increase in the retention of O-GlcNAc modification on proteins bound to the genome, suggesting most nuclear proteins are sensitive to effects of O-GlcNAc cycling. Interestingly, some loci are more sensitive to the impacts of a loss of OGA compared to others. This study will present an improved understanding of the regulation of gene expression by O-GlcNAc while providing the broader community with experimental methods for time-resolved analysis of genome-wide binding by proteins.
2020-01-07 | GSE124785 | GEO
Project description:An X-chromosome exome sequencing analysis identified a mutation in O-GlcNAc transferase (OGT) (pL254F) in a family with X-linked intellectual disability (XLID). Affected patient lymohoblastoids exhibit decreased steady state OGT levels owing to an unstable protein compared to the unaffected, related male controls. Suprisingly, global O-GlcNAc levels remained remained unaltered. This prompted us to check the both protein and mRNA levels of the other cycling enzyme, O-GlcNAcase (OGA) which was also lowered. This implies that a compensation mechanism exists, however imperfect, owing to the disease state of the individuals. We performed glabal transcriptome analysis to assess any other changes in message between patients and controls. Our study highlights small differences in the global transcriptome of patient lymhoblastoids that have the L254F mutation in O-GlcNAc transferase when compared to familial controls using Illumina sequencing of total RNA
2016-02-25 | E-GEOD-74263 | biostudies-arrayexpress
Project description:The reversible posttranslational O-GlcNAc modification of serine or threonine residues of intracellular proteins is involved in many cellular events from signaling cascades to epigenetic and transcriptional regulation. O-GlcNAcylation is a conserved nutrient-dependent process involving two enzymes, O-GlcNAc Transferase (OGT) adding O-GlcNAc while O-GlcNAcase (OGA) removing it in a manner that’s protein and context dependent. O-GlcNAcylation is essential for epigenetic regulation of gene expression through its action on Polycomb and Trithorax and Compass complexes. However, the important role of O-GlcNAc on adult life and healthspan have been largely unexplored, mainly due the lack of available model systems. Cataloging the O-GlcNAc proteome has proven useful in understanding the biology of this modification in vivo. In this study, we leveraged a recently developed oga knockout fly mutant to identify the O-GlcNAcylated proteins in adult Drosophila melanogaster. The adult O-GlcNAc proteome revealed many proteins related to cell and organismal growth, development, differentiation, and epigenetics. We identified many O-GlcNAcylated proteins that serve a role in increased growth and decreased longevity, including HCF, SIN3A, LOLA, KISMET, ATX2, SHOT, and FOXO.
2021-04-26 | PXD025344 | Pride
Project description:An X-chromosome exome sequencing analysis identified a mutation in O-GlcNAc transferase (OGT) (pL254F) in a family with X-linked intellectual disability (XLID). Affected patient lymohoblastoids exhibit decreased steady state OGT levels owing to an unstable protein compared to the unaffected, related male controls. Suprisingly, global O-GlcNAc levels remained remained unaltered. This prompted us to check the both protein and mRNA levels of the other cycling enzyme, O-GlcNAcase (OGA) which was also lowered. This implies that a compensation mechanism exists, however imperfect, owing to the disease state of the individuals. We performed glabal transcriptome analysis to assess any other changes in message between patients and controls.
2016-02-25 | GSE74263 | GEO
Project description:Dysfunctional mitochondria and generation of reactive oxygen species (ROS) promote chronic diseases, which have spurred interest in the molecular mechanisms underlying these conditions. Previously, we have demonstrated that disruption of post-translational modification of proteins with β-linked N-acetylglucosamine (O- glcnAcylation) via overexpression of the O-glcnAc–regulating enzymes O- glcnAc transferase (OGT) or O- glcnAcase (OGA) impairs mitochondrial function. Here, we report that sustained alterations in O- glcnAcylation either by pharmacological or genetic manipulation also alters metabolic function. Sustained O-glcnAc elevation in SH-SY5Y neuroblastoma cells increased OGA expression and reduced cellular respiration and ROS generation. Cells with elevated O-glcnAc levels had elongated mitochondria and increased mitochondrial membrane potential, and RNA-Seq in SH-SY5Y cells indicated transcriptome reprogramming and down regulation of the NRF2-mediated antioxidant response. Sustained O-glcnAcylation in mice brain and liver validated the metabolic phenotypes observed in the cells, and OGT knockdown in the liver elevated ROS levels, impaired respiration, and increased the NRF2 antioxidant response. Moreover, elevated O-glcnAc levels promoted weight loss and lowered respiration in mice and skewed the mice toward carbohydrate-dependent metabolism as determined by indirect calorimetry. In summary, sustained elevation in O-glcnAcylation coupled with increased OGA expression reprograms energy metabolism, a finding that has potential implications for the etiology, development, and management of metabolic diseases.
2017-07-20 | GSE101642 | GEO