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Loss of TET2 results in DNA methylation changes in mouse naïve B-cells

ABSTRACT: Absence of Tet2 at mouse cells results in gain of DNA methylation

ORGANISM(S): Mus musculus

PROVIDER: GSE132595 | GEO | 2020/06/29

REPOSITORIES: GEO

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Loss of TET2 results in DNA methylation changes in mouse GC B-cells (Bisulfite-Seq data set)

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Loss of TET2 results in gene expression represssion in mouse naïve B-cells and lymphoma cells [DNA-Seq]

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Loss of TET2 results in DNA methylation changes in mouse naïve B-cells

Project description:Loss of TET2 results in DNA methylation changes in mouse naïve B-cells

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Concomitant loss of TET2 and TET3 results in T cell expansion and genomic instability

Project description:TET proteins are tumor suppressors that through their catalytic activity oxidize 5-methylcytosine to 5-hydroxymethylcytosine, to promote DNA demethylation and to regulate gene expression. Notably, TET2 is the second most frequently mutated gene in hematological malignancies, including T cell lymphomas. However, murine models with deletion of TET2 do not exhibit T cell expansion, presumably due to redundancy with other members of the TET family of proteins. In order to gain insight on the TET mediated molecular events that safeguard T cells from aberrant proliferation we performed serial adoptive transfers of murine CD4 T cells that lack concomitantly TET2 and TET3 to fully immunocompetent congenic mice. Our data reveal a progressive acquisition of malignant traits upon loss of TET2 and TET3 that is characterized by loss of genomic integrity, acquisition of aneuploidy and upregulation of the protooncogene Myc.

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Concomitant loss of TET2 and TET3 results in T cell expansion and genomic instability [WGS]

Project description:TET proteins are tumor suppressors that through their catalytic activity oxidize 5-methylcytosine to 5-hydroxymethylcytosine, to promote DNA demethylation and to regulate gene expression. Notably, TET2 is one of the most frequently mutated genes in hematological malignancies, including T cell lymphomas. However, murine models with deletion of TET2 do not exhibit T cell expansion, presumably due to redundancy with other members of the TET family of proteins. In order to gain insight on the TET mediated molecular events that safeguard T cells from aberrant proliferation we performed serial adoptive transfers of murine CD4 T cells that lack concomitantly TET2 and TET3 to fully immunocompetent congenic mice. Our data reveal a progressive acquisition of malignant traits upon loss of TET2 and TET3 that is characterized by loss of genomic integrity, acquisition of aneuploidy and upregulation of the protooncogene Myc.

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Loss of TET2 results in gene expression represssion in mouse GC B-cells and lymphoma cells (RNA-Seq data set)

Project description:Absence of Tet2 at mouse cells results in reduced gene expression

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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.

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FLT3-ITD mutations and TET2 loss synergistically alter global DNA methylation in AML

Project description:Studies of AML patient samples have shown that specific combinations of AML disease alleles confer an adverse outcome, however, in vivo models do not exist for the majority of common, poor-prognosis genotypes. Here we show that TET2/FLT3 mutations can cooperate to induce AML in vivo using a genetically engineered mouse model, and that this model has a defined stem-cell population with a characteristic transcriptional and epigenetic profile. TET2 and FLT3 mutations cooperate to induce site-specific changes in DNA methylation and gene expression, including at loci that regulate hematopoietic differentiation. We demonstrate that re-expression of genes that are silenced in TET2/FLT3-mutant AML restores normal differentiation, demonstrating that the epigenetic program of TET2/FLT3-mutant AML cells can be reversed in vitro and in vivo. Using ERRBS, we profiled genome-wide DNA methylation patterns of the hematopoietic stem cells (LSK) population in Wide-type, Flt3-IDT, Tet2-/-, and Tet2-/-Flt3-IDT mice, each in triplicates

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