Filters
Technology
Platform
GSE144638
Homo sapiens
14 Downloadable Samples
Affymetrix Clariom S Human array (clariomshuman)
Description
Pediatric Acute Myeloid Leukemia (AML) is an aggressive and poor prognosis malignancy for which there are few effective targeted approaches, despite the numerous genetic alterations, including MLL gene rearrangements (MLL-r). The histone methyltransferase DOT1L is involved in supporting proliferation of MLL-r cells, for which a target inhibitor, Pinometostat, has been evaluated in a clinical trial recruiting pediatric MLL-r leukemic patients. However, modest clinical effects have been reported. Recent studies reported that additional leukemia subtypes lacking MLL-r are sensitive to DOT1L inhibition. Here we report that targeting DOT1L with Pinometostat sensitizes pediatric AML cells to further treatment with the multi-kinase inhibitor Sorafenib, irrespectively of MLL-r. DOT1L pharmacologic inhibition induces AML cell differentiation and modulated expression of genes with relevant roles in cancer development. Such modifications in transcriptional program impact on further treatments, inducing a strong sensitization to Sorafenib, with increased apoptosis and growth suppression of both AML cell lines and primary pediatric AML cells with diverse genotypes. We used microarrays to define differential regulation of gene expression in AML cell lines with or without MLL gene rearrangements following pharmacologic inhibition of DOT1L.
Publication Title
Inhibition of Methyltransferase DOT1L Sensitizes to Sorafenib Treatment AML Cells Irrespective of <i>MLL</i>-Rearrangements: A Novel Therapeutic Strategy for Pediatric AML.
Sample Metadata Fields
Treatment
View Samples- Homo sapiens
- 2 Downloadable Samples
- Affymetrix Human Genome U133 Plus 2.0 Array (hgu133plus2)
Description
Transcription factor complexes bind to regulatory sequences of genes, providing a system of individual expression regulation. Targets of distinct transcription factors usually map throughout the genome, without clustering. Nevertheless, highly and weakly expressed genes do cluster in separate chromosomal domains with an average size of 80 to 90 genes. We therefore asked whether, besides transcription factors, an additional level of gene expression regulation exists that acts on chromosomal domains. Here we show that identical green fluorescent protein (GFP) reporter constructs integrated at 90 different chromosomal positions determined by sequencing, obtain expression levels that correspond to the activity of the domains of integration. These domains are about 80 genes long and can exert an effect of up to 8-fold on the expression of integrated genes. 3D-FISH shows that active domains of integration have a more open chromatin structure than integration domains with weak activity. These results reveal a novel domain-wide regulatory mechanism that, together with transcription factors, exerts a dual control over gene transcription.
Publication Title
Domain-wide regulation of gene expression in the human genome.
Sample Metadata Fields
No sample metadata fields
View Samples- Mus musculus
- 40 Downloadable Samples
Illumina HiSeq 2500
Description
We report the application of single-molecule-based sequencing technology for high-throughput profiling of histone modifications in mammalian cells. By obtaining over four billion bases of sequence from chromatin immunoprecipitated DNA, we generated genome-wide chromatin-state maps of mouse embryonic stem cells, neural progenitor cells and embryonic fibroblasts. We find that lysine 4 and lysine 27 trimethylation effectively discriminates genes that are expressed, poised for expression, or stably repressed, and therefore reflect cell state and lineage potential. Lysine 36 trimethylation marks primary coding and non-coding transcripts, facilitating gene annotation. Trimethylation of lysine 9 and lysine 20 is detected at satellite, telomeric and active long-terminal repeats, and can spread into proximal unique sequences. Lysine 4 and lysine 9 trimethylation marks imprinting control regions. Finally, we show that chromatin state can be read in an allele-specific manner by using single nucleotide polymorphisms. This study provides a framework for the application of comprehensive chromatin profiling towards characterization of diverse mammalian cell populations. Overall design: GMP and MEP were isolated from Runx1+/+-Tg(vav-Cre) and Runx1fl/fl-Tg(vav-Cre) mice as well as Runx1fl/fl-Tg(vav-Cre) XMP, total RNA extracted and sequenced
Publication Title
Runx1 downregulates stem cell and megakaryocytic transcription programs that support niche interactions.
Sample Metadata Fields
Specimen part, Subject
View Samples- Homo sapiens
- 5 Downloadable Samples
- Affymetrix Human Genome U133 Plus 2.0 Array (hgu133plus2)
Description
The three-dimensional (3D) folding of the chromosomal fibre in the human interphase nucleus is an important, but poorly understood aspect of gene regulation. Especially basic principles of 3D chromatin and chromosome organisation are still elusive. In this paper, we quantitatively analyse the 3D structure of large parts of chromosomes 1 and 11 in the G1 nucleus of human cells and relate it to the human transcriptome map (HTM). Despite a considerable cell-to-cell variation, our results show that subchromosomal domains, which are highly expressed, are more decondensed, have a more irregular shape and are located in the nuclear interior compared to clusters of low expressed genes. These aspects of chromosome structure are shared by six different cell lines and therefore are independent of cell type specific differences in gene expression within the investigated domains. Systematic measurements show that there is little to no intermingling of chromatin from different parts of the same chromosome, indicating that the chromosomal fibre itself is a compact structure. Together, our results reveal several basic aspects of 3D chromosome architecture, which are related to genome function.
Publication Title
The three-dimensional structure of human interphase chromosomes is related to the transcriptome map.
Sample Metadata Fields
No sample metadata fields
View Samples- Mus musculus
- 16 Downloadable Samples
- Illumina HiSeq 2500
Description
The sequential activation of distinct developmental gene networks governs the ultimate identity of a cell, but the mechanisms by which downstream programs are activated are incompletely understood. The preB-cell receptor (preBCR) is an important checkpoint of B-cell development and essential for a preB-cell to traverse into an immature B-cell. Here, we show that activation of Mef2 transcription factors by preBCR is necessary for initiating the subsequent genetic network. We demonstrate that B-cell development is blocked at the preB-cell stage in mice deficient for Mef2c and Mef2d transcription factors and that preBCR signaling enhances the transcriptional activity of Mef2c/d through phosphorylation by the ERK5 mitogen activating kinase. This activation is instrumental in inducing Krüppel-like factor 2 and several immediate early genes of the AP1 and Egr family. Finally, we show that Mef2 proteins cooperate with the products of their target genes (Irf4 and Egr2) to induce secondary waves of transcriptional regulation. Our findings uncover a novel role for Mef2c/d in coordinating the transcriptional network that promotes early B-cell development. Overall design: RNA-seq experiments were performed from Mef2c/d knockout proB-cells versus control cells to identify genes regulated by Klf2
Publication Title
Essential control of early B-cell development by Mef2 transcription factors.
Sample Metadata Fields
Specimen part, Subject
View Samples- Mus musculus
- 16 Downloadable Samples
- Illumina HiSeq 2500
Description
The sequential activation of distinct developmental gene networks governs the ultimate identity of a cell, but the mechanisms by which downstream programs are activated are incompletely understood. The preB-cell receptor (preBCR) is an important checkpoint of B-cell development and essential for a preB-cell to traverse into an immature B-cell. Here, we show that activation of Mef2 transcription factors by preBCR is necessary for initiating the subsequent genetic network. We demonstrate that B-cell development is blocked at the preB-cell stage in mice deficient for Mef2c and Mef2d transcription factors and that preBCR signaling enhances the transcriptional activity of Mef2c/d through phosphorylation by the ERK5 mitogen activating kinase. This activation is instrumental in inducing Krüppel-like factor 2 and several immediate early genes of the AP1 and Egr family. Finally, we show that Mef2 proteins cooperate with the products of their target genes (Irf4 and Egr2) to induce secondary waves of transcriptional regulation. Our findings uncover a novel role for Mef2c/d in coordinating the transcriptional network that promotes early B-cell development. Overall design: RNA-seq experiments were performed from Blnk-/- preB-cells with an integration of BLNK-ERt2 to identify genes regulated after preBCR signaling
Publication Title
Essential control of early B-cell development by Mef2 transcription factors.
Sample Metadata Fields
Specimen part, Subject, Time
View Samples- Mus musculus
- 8 Downloadable Samples
- Illumina HiSeq 2500
Description
The sequential activation of distinct developmental gene networks governs the ultimate identity of a cell, but the mechanisms by which downstream programs are activated are incompletely understood. The preB-cell receptor (preBCR) is an important checkpoint of B-cell development and essential for a preB-cell to traverse into an immature B-cell. Here, we show that activation of Mef2 transcription factors by preBCR is necessary for initiating the subsequent genetic network. We demonstrate that B-cell development is blocked at the preB-cell stage in mice deficient for Mef2c and Mef2d transcription factors and that preBCR signaling enhances the transcriptional activity of Mef2c/d through phosphorylation by the ERK5 mitogen activating kinase. This activation is instrumental in inducing Krüppel-like factor 2 and several immediate early genes of the AP1 and Egr family. Finally, we show that Mef2 proteins cooperate with the products of their target genes (Irf4 and Egr2) to induce secondary waves of transcriptional regulation. Our findings uncover a novel role for Mef2c/d in coordinating the transcriptional network that promotes early B-cell development. Overall design: RNA-seq experiments were performed from Klf2 overexpressing BMiFLT3 (15-3) cells to identify genes regulated by Klf2
Publication Title
Essential control of early B-cell development by Mef2 transcription factors.
Sample Metadata Fields
Specimen part, Cell line, Subject
View Samples- Mus musculus
- 4 Downloadable Samples
- Illumina HiSeq 2500
Description
The sequential activation of distinct developmental gene networks governs the ultimate identity of a cell, but the mechanisms by which downstream programs are activated are incompletely understood. The preB-cell receptor (preBCR) is an important checkpoint of B-cell development and essential for a preB-cell to traverse into an immature B-cell. Here, we show that activation of Mef2 transcription factors by preBCR is necessary for initiating the subsequent genetic network. We demonstrate that B-cell development is blocked at the preB-cell stage in mice deficient for Mef2c and Mef2d transcription factors and that preBCR signaling enhances the transcriptional activity of Mef2c/d through phosphorylation by the ERK5 mitogen activating kinase. This activation is instrumental in inducing Krüppel-like factor 2 and several immediate early genes of the AP1 and Egr family. Finally, we show that Mef2 proteins cooperate with the products of their target genes (Irf4 and Egr2) to induce secondary waves of transcriptional regulation. Our findings uncover a novel role for Mef2c/d in coordinating the transcriptional network that promotes early B-cell development. Overall design: RNA-seq experiments were performed from Klf2 knockout proB-cells versus control cells to identify genes regulated by Klf2
Publication Title
Essential control of early B-cell development by Mef2 transcription factors.
Sample Metadata Fields
Specimen part, Subject
View Samples- Homo sapiens
- 12 Downloadable Samples
- IlluminaHiSeq2000
Description
The estrogen receptor-a (ERa) is a transcription factor which plays a critical role in controlling cell proliferation and tumorigenesis by recruiting various cofactors to estrogen response elements (EREs) to induce or repress gene transcription. A deeper understanding of these transcriptional mechanisms may uncover novel therapeutic targets for ERa-dependent cancers. Here we show for the first time that BRD4 regulates ERa-induced gene expression by affecting elongation-associated phosphorylation of RNA Polymerase II (RNAPII P-Ser2) and histone H2B monoubiquitination (H2Bub1). Consistently, BRD4 activity is required for estrogen-induced proliferation of ER+ breast and endometrial cancer cells and uterine growth in mice. Genome-wide occupancy studies revealed an enrichment of BRD4 on transcriptional start sites as well as EREs enriched for H3K27ac and demonstrate a requirement for BRD4 for H2B monoubiquitination in the transcribed region of estrogen-responsive genes. Importantly, we further demonstrate that BRD4 occupancy correlates with active mRNA transcription and is required for the production of ERa-dependent enhancer RNAs (eRNAs). These results uncover BRD4 as a central regulator of ERa function and potential therapeutic target. Overall design: mRNA expression profiles of MCF7 cells treated with +/- estrogen treatment under negative control siRNA, BRD4 siRNA or JQ1 treatment, in duplicates.
Publication Title
Bromodomain protein BRD4 is required for estrogen receptor-dependent enhancer activation and gene transcription.
Sample Metadata Fields
No sample metadata fields
View Samples- Homo sapiens
- 6 Downloadable Samples
- IlluminaHiSeq2000
Description
Bromodomain-containing protein 4 (BRD4) is an important epigenetic reader which promotes gene transcription to modulate cell-specific functions and is under intensive investigation for its potential as an anti-tumor therapeutic target. However, the role of BRD4 in non-transformed cells remains unclear. Here we demonstrate that BRD4 is required for the expression of epithelial-specific genes and suppression of stem cell-like properties by binding to the distal regions of epithelial-related genes. Moreover, BRD4 occupancy correlates with enhancer activity and enhancer RNA (eRNA) transcription of epithelial differentiation-specific genes. Interestingly, we show that BRD4 perturbation regulates the expression of Grainy Head-like transcription factor, GRHL3, whose depletion partially mimics BRD4 inhibition and blocks differentiated phenotype. By binding to the distal regions of GRHL3, BRD4 promotes RNA polymerase-II occupancy and thus affects eRNA transcription. Altogether, these findings provide evidence that BRD4 promotes a differentiated epithelial phenotype in non-transformed mammary cells at least in part through the activation of GRHL3 expression. Overall design: mRNA expression profiles of MCF10A cells under negative control siRNA, BRD4 siRNA or JQ1 treatment, in duplicates.
Publication Title
BRD4 promotes p63 and GRHL3 expression downstream of FOXO in mammary epithelial cells.
Sample Metadata Fields
No sample metadata fields
View Samples