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Dnmt3a regulates myeloproliferation and liver-specific homing and expansion of hematopoietic stem and progenitor cells (RNA-Seq)

ABSTRACT: DNMT3A mutations are observed in myeloid malignancies, including myeloproliferative neoplasms (MPN), myelodysplastic syndromes (MDS), and acute myeloid leukemia (AML). Here we investigated the impact of conditional hematopoietic Dnmt3a loss on disease phenotype in primary mice. Dnmt3a ablation led to a lethal, fully penetrant myeloproliferative neoplasm with myelodysplasia (MDS/MPN) characterized by marked, progressive hepatomegaly that was transplantable. We detected expanded stem/progenitor populations in the liver of Dnmt3a-ablated mice. Homing studies showed that Dnmt3a-deleted bone marrow cells preferentially migrated to the liver. Hence, in addition to the established role of Dnmt3a in regulating self-renewal, Dnmt3a regulates tissue tropism and limits myeloid progenitor expansion in vivo.

ORGANISM(S): Mus musculus

PROVIDER: GSE74161 | GEO | 2016/04/24

SECONDARY ACCESSION(S): PRJNA299192

REPOSITORIES: GEO

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Dnmt3a regulates myeloproliferation and liver-specific homing and expansion of hematopoietic stem and progenitor cells (Bisulfite-Seq)

Project description:DNMT3A mutations are observed in myeloid malignancies, including myeloproliferative neoplasms (MPN), myelodysplastic syndromes (MDS), and acute myeloid leukemia (AML). Here we investigated the impact of conditional hematopoietic Dnmt3a loss on disease phenotype in primary mice. Dnmt3a ablation led to a lethal, fully penetrant myeloproliferative neoplasm with myelodysplasia (MDS/MPN) characterized by marked, progressive hepatomegaly that was transplantable. We detected expanded stem/progenitor populations in the liver of Dnmt3a-ablated mice. Homing studies showed that Dnmt3a-deleted bone marrow cells preferentially migrated to the liver. Hence, in addition to the established role of Dnmt3a in regulating self-renewal, Dnmt3a regulates tissue tropism and limits myeloid progenitor expansion in vivo.

2016-04-24 | GSE74165 | GEO

Expression data from diseased Ezh2 KO Lineage-c-Kit+Sca-1+ (LSK) bone marrow cells

Project description:Recent studies have shown that epigenetic regulator are mutated in myelodysplastic syndrome (MDS) patients. Ezh2 is frequently mutated in hematopoietic malignant patients, however, the pathophysiological role of Ezh2 mutations has not been elucidated yet. In this study, we examined the function of Ezh2 in murine hematopoietic disease. Ezh2 deleted mice with myeloid malignancies including MDS, Myelodysplasia/myeloneoplasm(MDS/MPN), Myelodysplasia/myeloneoplasm_thrombocytosis(MDS/MPN_TC)

2015-03-14 | GSE66897 | GEO

Jarid2 Functions as a Tumor Suppressor in Myeloid Neoplasms by Repressing Self-Renewal in Hematopoietic Progenitor Cells

Project description:How specific genetic lesions contribute to transformation of non-malignant myeloproliferative neoplasms (MPN) and myelodysplastic syndromes (MDS) to secondary acute myeloid leukemia (sAML) are poorly understood. The JARID2 gene is lost by chromosomal deletions in a proportion of MPN/MDS patients who progress to sAML. In this study, genetic mouse models and patient-derived xenografts (PDX) demonstrated that Jarid2 acts as a tumor suppressor in chronic myeloid disorders. Genetic deletion of Jarid2 either reduced overall survival of MPN, or drove transformation to sAML, depending on the timing and context of co-operating mutations. Mechanistically, Jarid2 recruits PRC2 to epigenetically repress self-renewal pathways in hematopoietic progenitor cells. These studies establish Jarid2 as a bona fide hematopoietic tumor suppressor and highlight new therapeutic targets.

2018-09-30 | GSE120595 | GEO

ASXL1 Mutations Promote Myeloid Transformation Through Loss of PRC2-Mediated Gene Repression

2012-08-21 | GSE38861 | GEO

ASXL1 Mutations Promote Myeloid Transformation Through Loss of PRC2-Mediated Gene Repression

Project description:Recurrent somatic ASXL1 mutations occur in patients with myelodysplasia (MDS), myeloproliferative neoplasms (MPN), and acute myeloid leukemia (AML), and are associated with adverse outcome. Despite the genetic and clinical data implicating ASXL1 mutations in myeloid malignancies, the mechanisms of transformation by ASXL1 mutations are not understood. Here we identify that ASXL1 mutations result in loss of PRC2-mediated histone H3 lysine 27 (H3K27) tri-methylation. Through integration of microarray data with genome-wide histone modification ChIP-Seq data we identify targets of ASXL1 repression including the posterior HOXA cluster that is known to contribute to myeloid transformation. We demonstrate that ASXL1 associates with the Polycomb repressive complex 2 (PRC2), and that loss of ASXL1 in vivo collaborates with NRASG12D to promote myeloid leukemogenesis. To assess the genome-wide effects of ASXL1 loss on chromatin state we performed chromatin immunoprecipitation followed by next generation sequencing (CHIP-seq) for histone modifications known to be associated with PcG (histone H3 lysine 27 trimethylation (H3K27me3)) or TxG activity (histone H3 lysine 4 trimethylation (H3K4me3)) in UKE1 cells expressing empty vector (EV) or 2 independent validated shRNAs for ASXL1. This Series represents the ChIP-Seq data (not the microarray data referenced in the summary above). The related micorarray data are available in GEO as GSE38692.

2012-08-21 | E-GEOD-38861 | biostudies-arrayexpress

Small molecule inhibitors of lysyl oxidases synergize with 5-azacytidine to restore erythropoiesis in myeloid neoplasms

Project description:In this study, we assessed the effects of lysyl oxidase (LOX/LOXL) inhibition on the composition of extracellular matrix (ECM) produced by in vitro expanded bone marrow derived mesenchymal stromal cells (MSCs) of n=3 patients with myelodysplastic syndromes (MDS) and myeloproliferative neoplasms (MPN).

2023-02-17 | PXD031217 | Pride

IGR_Itzykson_CMML

Project description:Genomic studies in chronic myeloid malignancies, including myeloproliferative neoplasms (MPN), myelodysplastic syndromes (MDS) and MPN/MDS, have identified common mutations in genes encoding signaling, epigenetic, transcription and splicing factors. Analysis of 18 of these genes in a cohort of 224 chronic myelomonocytic leukemias (CMML), which is the most frequent MPN/MDS, identified at least one mutated gene in 95% of the patients, with some of the mutations affecting the disease phenotype. The number of mutated genes negatively affected progression-free and overall survival in multivariate analysis. Analysis of sorted progenitors indicated an early amplification of the CMML clone at the CD34+/CD38- stage of hematopoiesis, together with a premature granulomonocytic differentiation skewing. We interrogated the clone architecture by mutation-specific discrimination analysis of single-cell-derived colonies. The genetic classification of individual colonies allowed a designation of sub-clones and the assembly of putative evolutionary trees, indicating a linear acquisition of the studied mutations. Analysis of matched pre- and post-treatment samples demonstrated clonal persistence with limited and selective elimination of sub-clones. The disease was characterized by an amplification of multipotent and common myeloid progenitors in the CD34+ compartment, both fractions showing increased granulomonocytic differentiation at the expense of erythroid progenitors, contrasting with normal granulomonocytic progenitors. Altogether, early amplification of the leukemic clone and increased granulomonocytic differentiation of early progenitors may account for the specificity of CMML among myeloid neoplasms. This experiment correspond to the analysis of gene expression profiles in total CD34+ cells from the peripheral blood of 15 patients (Chronic Myelomonocytic Leukemia) and 4 healthy controls.

2013-01-17 | E-MTAB-1044 | biostudies-arrayexpress

Evi1 governs Kdm6b-mediated histone demethylation to finely regulate the Laptm4b-driven mTORC pathway in vivo [LK]

Project description:Ecotropic viral integration site 1 (EVI1/MECOM) overexpression is common in myeloid malignancies. We present a new Evi1 transgenic mouse model with inducible expression in hematopoietic stem cells (HSCs) and progenitor cells (HPCs) at lower levels. Upon exogenous Evi1 induction, mice displayed anemia, thrombocytopenia, lymphopenia, and dysplasia in erythroid and megakaryocyte cells with a significant expansion of committed myeloid progenitor cells, resembling human Myelodysplastic syndrome/Myeloproliferative neoplasm (MDS/MPN)-like disease. Methods: Lin-C-Kit+ cells were isolated from 3 pairs of WT and Evi1 overexpressing mice. Around 1X106 Lin-C-Kit+ cells were harvested from each mouse. Then the cells were lysated by Trizol and total RNA was extracted by phenol-chloroform. Results: Molecular pathways altered in Lin-C-Kit+ cells from Evi1-OE mice. Conclusions: Multiple molecular pathways changed in Evi1 overexpressing hematopoietic stem and progenitor cells.

2023-06-27 | GSE235440 | GEO

Evi1 governs Kdm6b-mediated histone demethylation to finely regulate the Laptm4b-driven mTORC pathway in vivo [LSK]

Project description:Ecotropic viral integration site 1 (EVI1/MECOM) overexpression is common in myeloid malignancies. We present a new Evi1 transgenic mouse model with inducible expression in hematopoietic stem cells (HSCs) and progenitor cells (HPCs) at lower levels. Upon exogenous Evi1 induction, mice displayed anemia, thrombocytopenia, lymphopenia, and dysplasia in erythroid and megakaryocyte cells with a significant expansion of committed myeloid progenitor cells, resembling human Myelodysplastic syndrome/Myeloproliferative neoplasm (MDS/MPN)-like disease. Methods: LSK cells were sorted by Sony SH800 from 3 pairs of mice transplanted with WT BM cells and Evi1-OE BM cells after pIpC injection. Around 5X103 LSK cells were harvested from each mouse. Then the cells were lysated by Trizol and total RNA was extracted by phenol-chloroform. Results: Molecular pathways altered in LSK cells from recipient mice transplanted with Evi1-OE BM cells. Conclusions: Transcription profile changed in Evi1 overexpressing hematopoietic stem and progenitor cells.

2023-06-27 | GSE235441 | GEO

Description of the microRNA repertoire of leucocytes of patients suffering from atypical myeloproliferative syndromes

Project description:Atypical Myeloproliferative Neoplasms (aMPN) share characteristics of MPN and Myelodysplastic Syndromes (MDS). Although anomalies of tyrosine-kinases or proteins involved in cytokine signaling are common in MPN, the pathophysiology of atypical MPN is still elusive. Since deregulation of microRNAs has been involved in the biology of various cancers, we screened the miRNome of aMPN compared to CML or reactive hyperleukocytosis (RHL) states. The study highligths the overexpression of miR-10a in the aMPN group We analysed the microRNA repertoire of blood leukocyte RNA from patients with aMPN (n=16), CML (n=10) or reactive hyperleukocytosis (n=4)

2016-09-01 | E-GEOD-75666 | biostudies-arrayexpress

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