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Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

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The Histone Methyltransferases MLL1 and DOT1L Cooperate with Meningioma-1 to Induce AML [Human ChIP-seq]

ABSTRACT: Purpose: To characterize the genome-wide distribution of H3K79me2 in human leukemia cell lines treated with the Dot1l inhibitor EPZ004777 or control Methods: We performed Chip-seq for the H3K79me2 on the leukemia cell lines Mutz3, Loucy and Molm14 after 6 days in culture in the presence of 3uM EPZ004777 or DMSO control Results: H3K79me2 is completely erased from key target genes such as the HOXA cluster. Conclusions: Exposure of Mutz3, Loucy and Molm14 to 3uM EPZ004777 erases H3K79 methylation globally as well as on key loci ChIP-Seq for H3K79me2 on human leukemia cell lines exposed for 6 days to the Dot1l inhibitor EPZ004777

ORGANISM(S): Homo sapiens

SUBMITTER: Tobias Neff

PROVIDER: E-GEOD-76745 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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The Histone Methyltransferases MLL1 and DOT1L Cooperate with Meningioma-1 to Induce AML [Human ChIP-seq]

Project description:Purpose: To characterize the genome-wide distribution of H3K79me2 in human leukemia cell lines treated with the Dot1l inhibitor EPZ004777 or control Methods: We performed Chip-seq for the H3K79me2 on the leukemia cell lines Mutz3, Loucy and Molm14 after 6 days in culture in the presence of 3uM EPZ004777 or DMSO control Results: H3K79me2 is completely erased from key target genes such as the HOXA cluster. Conclusions: Exposure of Mutz3, Loucy and Molm14 to 3uM EPZ004777 erases H3K79 methylation globally as well as on key loci

2016-01-12 | GSE76745 | GEO

The Histone Methyltransferases MLL1 and DOT1L Cooperate with Meningioma-1 to Induce AML [Human RNA-seq]

Project description:Purpose: To characterize transcriptional changes associated with inhibition of Dot1l in 2 inv(16) patient AML samples Methods: We sequenced mRNA from patient samples that were exposed to 5 uM EPZ004777 or DMSO control for 7 days. Results: Inhibition of Dot1l leads to gene expression changes in genes related to cell growth and cell cycle. Examination of mRNA levels between cells treated with 5 uM EPZ004777 or DMSO control

2016-01-12 | E-GEOD-76747 | biostudies-arrayexpress

The Histone Methyltransferases MLL1 and DOT1L Cooperate with Meningioma-1 to Induce AML [Mouse ChIP-seq]

Project description:Purpose: To characterize the genome-wide distribution of H3K79me2 in murine MN1 driven myeloid leukemia Methods: We performed Chip-seq for the H3K79me2 in leukemias isolated from moribund mice that had been injected with common myeloid progenitors (CMPs) transduced with MSCV-MN1-GFP Results: H3K79me2 is enriched at key loci that 1. are bound by MN1 in the data set of Heuser et al, (Cancer Cell. 2011 Jul 12;20(1):39-52.), 2. upregulated upon transduction with MN1, and lose expression upon deletion of the H3K79 methyltransferase Dot1l. Conclusions: A leukemogenic program in MN1 leukemias is marked by H3K79me2 and dependent on this mark ChIP-Seq for H3K79me2 using MN1 driven leukemias isolated from the bone marrow of moribund mice.

2016-01-12 | E-GEOD-76746 | biostudies-arrayexpress

The Histone Methyltransferases MLL1 and DOT1L Cooperate with Meningioma-1 to Induce AML [Mouse Dot1l ko RNA-seq]

Project description:Purpose: To characterize transcriptional changes associated with homozygous inactivation of Dot1l or Mll1 in MN1 driven AML Methods: We sequenced mRNA from murine LSK-cells transformed using forced expression of MN1 (MSCV-MN1-IRES-GFP), and transduced with Cre-vector to inactivate either Dot1l or Mll1. Cells were sorted for Cre-expression (pTomato fluorescent marker) or expression of an inert control vector. Results: Inactivation of either Dot1l or Mll1 in this model leads to a substantial delay or complete abrogation of leukemia development. Loss of Dot1l or Mll1 are associated with gene expression changes that have substantial overlap. In addition, genes that are downregulated follwing inactivation of Dot1l or Mll1 have substantial overlap with the gene set upregulated in MN1 transduced CMPs. Conclusions: MN1 mediated leukemogenesis is associated with a gene expression program that dependes on Mll1 and Dot1l Examination of mRNA levels between Dot1l f/f and Dot1l ko, and Mll1 f/f and Mll1 ko.

2016-01-12 | E-GEOD-76748 | biostudies-arrayexpress

The Histone Methyltransferases MLL1 and DOT1L Cooperate with Meningioma-1 to Induce AML [Mouse Mll1 ko RNA-seq]

Project description:Purpose: To characterize transcriptional changes associated with homozygous inactivation of Dot1l or Mll1 in MN1 driven AML Methods: We sequenced mRNA from murine LSK-cells transformed using forced expression of MN1 (MSCV-MN1-IRES-GFP), and transduced with Cre-vector to inactivate either Dot1l or Mll1. Cells were sorted for Cre-expression (pTomato fluorescent marker) or expression of an inert control vector. Results: Inactivation of either Dot1l or Mll1 in this model leads to a substantial delay or complete abrogation of leukemia development.Loss of Dot1l or Mll1 are associated with gene expression changes that have substantial overlap. In addition, genes that are downregulated follwing inactivation of Dot1l or Mll1 have substantial overlap with the gene set upregulated in MN1 transduced CMPs. Conclusions: MN1 mediated leukemogenesis is associated with a gene expression program that dependes on Mll1 and Dot1l Examination of mRNA levels between Dot1l f/f and Dot1l ko, and Mll1 f/f and Mll1 ko.

2016-01-12 | E-GEOD-76749 | biostudies-arrayexpress

H3K79me2 ChIP-seq in prostate cancer cells

Project description:We report the application of ChIP sequencing technology for high-throughput profiling of H3K79me2 in prostate cancer cells. We generated genome-wide maps of LNCaP and PC3 cells that were treated with the specific DOT1L inhibitor EPZ004777. We find that lysine 79 dimethylation is sensitive to DOT1L inhibition in both cell lines, however the enrichment of K79 methylated peaks differed between the two cell lines.

2019-08-09 | GSE135574 | GEO

Inhibition of DOT1L increases osteoclast fusion and resorption and aggravates bone loss

Project description:Osteoclasts are absorptive cells and play a critical role in homeostatic bone remodeling and pathological bone resorption. Emerging evidence suggests an important role for epigenetic regulation of osteoclastogenesis. In this study, we investigated the role of DOT1L, which regulates gene expression epigenetically by histone H3K79 methylation during osteoclast formation. DOT1L and H3K79me2 levels were upregulated during osteoclast differentiation. Small molecule inhibitor- (EPZ5676 or EPZ004777) or short hairpin RNA-mediated reduction in DOT1L expression promoted osteoclast differentiation and resorption. DOT1L inhibition also increased osteoclast area and accelerated bone mass reduction in a mouse ovariectomy (OVX) model of osteoporosis. DOT1L inhibitors did not alter osteoblast differentiation in vitro and in vivo. Proteomics data, together with bioinformatics analysis, revealed that DOT1L inhibition altered reactive oxygen species (ROS) generation, autophagy activation, and cell fusion-related protein expression. ROS generation increased, and autophagy activation and cell migration ability enhancement were verified subsequently by flow cytometry and transwell migration assays. DOT1L inhibition increased NFATc1 nuclear translocation and NF-κB activation and strengthend osteoclast fusion and expression of resorption-related protein CD9, and MMP9 in osteoclasts derived from RAW264.7. Our findings support a new mechanism of DOT1L-mediated H3K79me2 epigenetic regulation of osteoclast differentiation, implicating DOT1L as a new therapeutic target for osteoclast dysregulation-induced disease.

2018-01-24 | PXD006448 | Pride

Epigenetic profiling of hematopoietic stem cells and leukemia stem cells

Project description:The histone 3 lysine 79 (H3K79) methyltransferase Dot1l has been implicated in the development of leukemias bearing translocations that involve the Mixed Lineage Leukemia (MLL) gene. We identified the MLL-fusion targets in a murine MLL-AF9 leukemia model, and conducted epigenetic profiling for H3K79me2, H3K4me3, H3K27me3 and H3K36me3. Histone methylation patterns are highly abnormal on MLL-AF9 fusion target loci, defining a distinct epigenetic lesion involving H3K79. Conditional inactivation of Dot1l leads to specific down-regulation of direct MLL-AF9 targets and an MLL-translocation associated gene expression signature, while global transcription levels remain largely unaffected. This correlated with a greater sensitivity of leukemic blasts towards loss of Dot1l compared to normal hematopoietic cells. Development of in vivo leukemia was absolutely dependent on Dot1l. Chromatin immunoprecipitation followed by Solexa sequencing for H3K4me3, H3K27me3, H3K36me3, H3K79me2 and biotinylated MLL-AF9 in HSC, GMP and LSC.

2011-09-13 | E-GEOD-29130 | biostudies-arrayexpress

Expression Profiling of Mixed Lineage Leukemia Cells Treated with a Potent Small-Molecule DOT1L Inhibitor

Project description:Cell lines bearing MLL translocations (MV4-11 and MOLM-13) were treated with a potent, selective inhibitor of the DOT1L histone methyl transferase. Treatment of MLL-rearranged cell lines with the DOT1L inhibitor selectively inhibits H3K79 methylation and blocks expression of leukemogenic genes. Here we provide expression profiling data of cells treated with DOT1L inhibitor or vehicle control. MV4-11 cells were treated with 3 uM EPZ004777 (DOT1L inhibitor) or vehicle control (0.1% DMSO) for 2, 4 and 6 days. MOLM-13 cells were treated with 3 uM EPZ004777 (DOT1L inhibitor) or vehicle control (0.1% DMSO) for 6 days. For each unique conditon, 3 biological replicates were generated for expression profiling.

2011-07-11 | E-GEOD-29828 | biostudies-arrayexpress

Degree of Recruitment of DOT1L to MLL-AF9 Defines Level of H3K79 Di- and Tri-methylation on Target Genes and Transformation Potential

Project description:The MLL gene is a common target of chromosomal translocations found in human leukemia. MLL-fusion leukemias are consistently poor prognosis. One of the most common translocation partners is AF9 (a.k.a. MLLT3). MLL-AF9 recruits DOT1L, a histone 3 lysine 79 methyltransferase (H3K79me1/me2/me3), leading to aberrant gene transcription. We show that DOT1L has three AF9 binding sites, and present the NMR solution structure of a DOT1L-AF9 complex. We generated structure-guided point mutations with graded effects on recruitment of DOT1L to MLL-AF9. ChIP-Seq analyses of H3K79me2 and H3K79me3 show that graded reduction of the DOT1L interaction with MLL-AF9 results in selective losses in H3K79me2 and me3 marks at MLL-AF9 target genes. Furthermore, the degree of DOT1L recruitment defines the level of MLL-AF9 hematopoietic transformation. Hematopoietic progenitor cells isolated from mouse bone marrow were transduced with retrovirus expressing either wildtype MLL-AF9 (WT), mutants, MLL-AF9 (D544R) and MLL-AF9 (D546R). ChIP-Seq analyses were performed on these wildtype and mutant cells using H3K79me2 and H3K79me3 antibodies. 3 samples corresponding to ChIP-Seq with H3K79me2 antibody: 1) MLL-AF9 (WT) 2) MLL-AF9 (D544R) 3) MLL-AF9 (D546R) 3 Samples Corresponding to ChIP-Seq with H3K79me3 antibody: 4) MLL-AF9 (WT) 5) MLL-AF9 (D544R) 6) MLL-AF9 (D546R)

2015-04-30 | E-GEOD-64365 | biostudies-arrayexpress

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