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Limiting thymic progenitor supply and oncogenesis

ABSTRACT: NGS whole genome sequencing from five murine lymphoid tumours (m137, m189, m191, m209, m313 and m97) and one control sample C57B1/6 Sca1+ progenitor cells.

PROVIDER: PRJEB8006 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR701702_1.fastq.gz	Fastqsanger.gz
	ERR701702_2.fastq.gz	Fastqsanger.gz

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Limiting thymic progenitor supply and oncogenesis

Project description:Microarray data from five murine T cell malignant clones (m137, m189, m191, m209 and m313) and thymocytes and splenic T cells from wild-type C57Bl/6 control mice

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Limiting Thymic Precursor Supply Increases the Risk of Lymphoid Malignancy in Murine X-Linked Severe Combined Immunodeficiency.

Project description:In early gene therapy trials for SCID-X1, using γ-retroviral vectors, T cell leukemias developed in a subset of patients secondary to insertional proto-oncogene activation. In contrast, we have reported development of T cell leukemias in SCID-X1 mice following lentivirus-mediated gene therapy independent of insertional mutagenesis. A distinguishing feature in our study was that only a proportion of transplanted γc-deficient progenitors were transduced and therefore competent for reconstitution. We hypothesized that reconstitution of SCID-X1 mice with limiting numbers of hematopoietic progenitors might be a risk factor for lymphoid malignancy. To test this hypothesis, in the absence of transduction, SCID-X1 mice were reconstituted with serially fewer wild-type hematopoietic progenitors. A robust inverse correlation between hematopoietic progenitor cell dose and T-lymphoid malignancy was observed, with earlier disease onset at lower cell doses. Malignancies were of donor origin and carried activating Notch1 mutations. These findings align with emerging evidence that thymocyte self-renewal induced by progenitor deprivation carries an oncogenic risk that is modulated by intra-thymic competition from differentiation-committed cells. Although insertional proto-oncogene activation is required for the development of malignancy in humans, failure of γc-deficient thymocytes to effectively compete with this at-risk cell population may have also contributed to oncogenesis observed in early SCID-X1 trials.

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LMO2 expression in HSCs causes T-ALL in the presence of an intact thymic niche [preleukemic and leukemic cells]

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LMO2 expression in HSCs causes T-ALL in the presence of an intact thymic niche [preleukemic and leukemic cells]

Project description:We used microarrays to investigate gene expression changes in tumor-bearing Sca1-TOMATO-Lmo2 mice and in preleukemic cells from Sca1-TOMATO-Lmo2 mice. Tumor-bearing thymus of eleven Sca1-TOMATO-Lmo2 mice compared with thymus cells from 4 WT mice, with TOMATO-positive thymus preleukemic T cells from 5 Sca1-TOMATO-Lmo2 mice and with TOMATO-negative thymus preleukemic T cells from 5 Sca1-TOMATO-Lmo2 mice GSM2209749 - GSM220975 and GSM2209757 - GSM2209759 were re-analyzed by GSE83571 (GSM2209767 - GSM2209776).

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LMO2 expression in HSCs causes T-ALL in the presence of an intact thymic niche [nude mice]

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2016-06-22 | E-GEOD-83571 | biostudies-arrayexpress

LMO2 expression in HSCs causes T-ALL in the presence of an intact thymic niche [nude mice]

Project description:We used microarrays to investigate gene expression changes in tumor-bearing Sca1-TOMATO-Lmo2 Nu/Nu mice

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Antagonistic roles of canonical and alternative-RPA in disease-associated tandem CAG repeat instability

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2023-10-13 | PXD044158 | Pride

A mouse model of deregulation of the malt1 oncogene recapitulates the pathogenesis of human malt lymphoma [MouseSca1 dataset]

Project description:Attempts at modeling chromosomal translocations involving MALT1 gene, hallmarks of human mucosa-associated lymphoid tissue (MALT) lymphoma, have failed to reproduce the disease in mice. Here we describe a transgenic model in which MALT1 expression was targeted to mouse hematopoietic stem/progenitor cells. In Sca1-MALT1 mice, MALT1 deregulation activated the NF-kappaB pathway in Sca1+ cells, promoting selective B-cell differentiation and mature lymphocyte accumulation in extranodal tissues, progressively leading to the development of clonal B-cell lymphomas. These tumors recapitulated the histopathological features of human MALT lymphomas, presenting typical lymphoepithelial lesions and plasmacytic differentiation. Transcriptional profiling of Sca1-MALT1 murine lymphomas revealed overlapping molecular signatures with human MALT lymphomas, including MALT1-mediated NFkappaB activation, pro-inflammatory signaling and XBP1-induced plasmacytic differentiation. Moreover, murine Malt1 showed proteolytic activity by cleaving Bcl10 in Sca1-MALT1 lymphomas. Our novel technological approach has allowed modeling human MALT lymphoma in mice, which represent unique tools study MALT lymphoma biology and evaluate anti-MALT1 therapies. Keywords: Genetic modification, wt vs. transgenic, MALT1 expression 8 sorting purified Sca1+Lin- samples were analized of which 5 were from Sca1-MALT1 transgenic mice and 3 were from WT mice.

2012-07-09 | E-GEOD-25636 | biostudies-arrayexpress

Expression of MALT1 oncogene in mouse hematopoietic stem/progenitor cells recapitulates the pathogenesis of human MALT lymphoma

Project description:Comparison of gene expression profiling analysis of bone marrow isolated CD34+ cells from patients with MALT lymphoma vs. healthy individuals revealed a large number of differentially expressed genes that included NF-kB target genes, genes involved in inflamatory signalling and immunoglobulin genes, suggesting an early lymphoid B-cell priming. Chromosomal translocations involving MALT1 gene are hallmarks of mucosa-associated lymphoid tissue (MALT) lymphoma. However, targeting these translocations to mouse B-cells has failed to reproduce human disease. Here, we induced MALT1 expression in mouse Sca1+Lin- hematopoietic stem/progenitor cells (HS/PCs), leading to the development of tumors recapitulating the clinical, histopathological and molecular features of human MALT lymphomas. Ablation of the p53 gene induced transformation of MALT lymphoma to diffuse large-cell lymphoma of activated B-cell type (ABC-DLBCL). Human CD34+ cells isolated from MALT lymphoma patients displayed an abnormal transcriptional program that was shared by MALT lymphoma cells, transgenic mouse Sca1+Lin- cells and Sca1-MALT1-induced lymphomas. Our study shows that MALT lymphoma can be modeled in mice by targeting MALT1 oncogene to HS/PCs.

2012-07-10 | GSE34015 | GEO

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