Jak2 mediated phosphorylation and activation of TET2 in hematopoiesis
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA478948 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:FDCP cells were stably transfected with JAK2V617F or WT JAK2 vectors and then examined for genome wide methylation with the HELP assay
2020-01-01 | GSE116537 | GEO
Project description:Even though the Ten-eleven translocation (TET) enzymes catalyze the generation of 5-hydroxymethylcytosines required for lineage commitment and subsequent differentiation of stem cells into erythroid cells, the mechanisms that link extracellular signals to TET activation and DNA hydroxymethylation are unknown. We demonstrate that hematopoietic cytokines phosphorylate TET2, leading to its activation in erythroid progenitors. Specifically, cytokine receptor-associated JAK2 phosphorylates TET2 at tyrosines 1939 and 1964. Phosphorylated TET2 interacts with the erythroid transcription factor KLF1, and this interaction with TET2 is increased upon exposure to erythropoietin. The activating JAK2V617F mutation seen in myeloproliferative disease patient samples and in mouse models is associated with increased TET activity and cytosine hydroxymethylation as well as genome-wide loss of cytosine methylation. These epigenetic and functional changes are also associated with increased expression of several oncogenic transcripts. Thus, we demonstrate that JAK2-mediated TET2 phosphorylation provides a mechanistic link between extracellular signals and epigenetic changes during hematopoiesis. SIGNIFICANCE: Identification of TET2 phosphorylation and activation by cytokine-stimulated JAK2 links extracellular signals to chromatin remodeling during hematopoietic differentiation. This provides potential avenues to regulate TET2 function in the context of myeloproliferative disorders and myelodysplastic syndromes associated with the JAK2V617F-activating mutation.This article is highlighted in the In This Issue feature, p. 681.
| S-EPMC6697164 | biostudies-literature
Project description:Metabolic control of innate immune activation in TET2-mutant clonal hematopoiesis
| PRJNA1268223 | ENA
Project description:TET2 mutations drive inflammation in clonal hematopoiesis of indeterminate potential (CHIP), but the mechanism by which TET2 inactivation leads to inflammation is not understood. Here, we used in vivo genome-wide genetic perturbations in primary wildtype (WT) or Tet2 knockout (KO) Cas9+ hematopoietic stem-progenitor cells (HSPCs) in a model of zymosan peritonitis to elucidate the basis of Tet2 KO inflammation. We found that Tet2 restrains O-linked N-acetylglucosamine (O-GlcNAc) glycosyltransferase (Ogt), a Tet2 binding partner and metabolic sensor that integrates nutrient availability. Tet2 loss disrupts this Tet2-Ogt interaction, and dysregulated Ogt facilitates widespread H3K4 trimethylation including lipid-related gene loci and inflammatory lipid droplet formation. We identified ATP citrate lyase (Acly) as a critical node for lipid accumulation, inflammation, and myeloid expansion in Tet2 deficiency. In summary, we reveal that Tet2 serves as a negative regulator of the nutrient sensor Ogt, and that Tet2 inactivation leads to aberrant lipid droplet formation and inflammation.
2026-01-15 | GSE298064 | GEO
Project description:Hyperactivation of JAK2 kinase is a unifying feature of human Ph- myeloproliferative neoplasms (MPNs), most commonly due to the JAK2 V617F mutation. Mice harboring a homologous mutation in the Jak2 locus exhibit a phenotype resembling polycythemia vera. NFκB pathway hyperactivation is present in myeloid neoplasms, including MPNs, despite scarcity of mutations in NFκB pathway genes. To determine the impact of NFκB pathway hyperactivation in conjunction with Jak2 V617F, we utilized Ikk2 (Ikk2-CA) mice. Pan-hematopoietic Ikk2-CA alone produced depletion of hematopoietic stem cells and B cells. When combined with the Jak2 V617F mutation, Ikk2-CA rescued the polycythemia vera phenotype of Jak2 V617F. Likewise, Jak2 V617F ameliorated defects in hematopoiesis produced by Ikk2-CA. Single-cell RNA sequencing of hematopoietic stem and progenitor cells revealed multiple genes antagonistically regulated by Jak2 and Ikk2, including subsets whose expression was altered by Jak2 V617F and/or Ikk2-CA but partly or fully rectified in the double mutant. We hypothesize that Jak2 promotes hematopoietic stem cell population self-renewal, whereas Ikk2 promotes myeloid lineage differentiation, and biases cell fates at several branch points in hematopoiesis. Jak2 and Ikk2 both regulate multiple genes affecting myeloid maturation and cell death. Therefore, the presence of dual Jak2 and NFκB hyperactivation may present neomorphic therapeutic vulnerabilities in myeloid neoplasms.
2025-04-07 | GSE263101 | GEO
Project description:Model describing how HOXA9 may control the evolution of myeloproliferative neoplasms by integrating the orders of JAK2 and TET2 mutation
2023-03-17 | MODEL2212110001 | BioModels
Project description:TET2 mutations drive inflammation in clonal hematopoiesis of indeterminate potential (CHIP), but the mechanism by which TET2 inactivation leads to inflammation is not understood. Here, we used in vivo genome-wide genetic perturbations in primary wildtype (WT) or Tet2 knockout (KO) Cas9+ hematopoietic stem-progenitor cells (HSPCs) in a model of zymosan peritonitis to elucidate the basis of Tet2 KO inflammation. We found that Tet2 restrains O-linked N-acetylglucosamine (O-GlcNAc) glycosyltransferase (Ogt), a Tet2 binding partner and metabolic sensor that integrates nutrient availability. Tet2 loss disrupts this Tet2-Ogt interaction, and dysregulated Ogt facilitates widespread H3K4 trimethylation including lipid-related gene loci and inflammatory lipid droplet formation. We identified ATP citrate lyase (Acly) as a critical node for lipid accumulation, inflammation, and myeloid expansion in Tet2 deficiency. In summary, we reveal that Tet2 serves as a negative regulator of the nutrient sensor Ogt, and that Tet2 inactivation leads to aberrant lipid droplet formation and inflammation.
2026-01-15 | GSE309775 | GEO
Project description:Clonal hematopoiesis of indeterminate potential is prevalent in elderly individuals and associated with increased risks of all-cause mortality and cardiovascular disease. However, mouse models to study the dynamics of clonal hematopoiesis and its consequences on the cardiovascular system under homeostatic conditions are lacking. We used a model of clonal hematopoiesis using adoptive transfer of unfractionated ten-eleven translocation 2-mutant (Tet2-mutant) bone marrow cells into nonirradiated mice. Consistent with age-related clonal hematopoiesis observed in humans, these mice displayed a progressive expansion of Tet2-deficient cells in multiple hematopoietic stem and progenitor cell fractions and blood cell lineages. The expansion of the Tet2-mutant fraction was also observed in bone marrow-derived CCR+ myeloid cell populations within the heart, but there was a negligible impact on the yolk sac-derived CCR2- cardiac resident macrophage population. Transcriptome profiling revealed an enhanced inflammatory signature in the donor-derived macrophages isolated from the heart. Mice receiving Tet2-deficient bone marrow cells spontaneously developed age-related cardiac dysfunction characterized by greater hypertrophy and fibrosis. Altogether, we show that Tet2- mediated hematopoiesis contributes to cardiac dysfunction in a nonconditioned setting that faithfully models the human clonal hematopoiesis in unperturbed bone marrow. Our data support clinical findings that clonal hematopoiesis per se may contribute to diminished health span.
2020-03-12 | GSE146812 | GEO
Project description:Metabolic control of innate immune activation in TET2-mutant clonal hematopoiesis [ChIP-seq]
| PRJNA1363152 | ENA
Project description:To investigate the signaling pathway required for the Tet2 mutant associated clonal hematopoiesis, we identified the activated signaling pathway in Tet2-deficient hematopoietic stem/progenitor cells compared to WT cells and using transgentic mouse model to validate our findings. In short, the cGAS-STING pathway is activated in Tet2-deficient HSPCs and promotes the development of CH associated with Tet2 deficiency.
2023-05-15 | GSE232384 | GEO