Filters
Technology
Platform
SRP119473
Mus musculus
25 Downloadable Samples
Illumina HiSeq 2500
Description
Polycomb repressive complex 2 (PRC2-EZH2) methylates histone H3 at lysine 27 (H3K27) and is required to maintain gene repression during development. Misregulation of PRC2 is linked to a range of neoplastic malignancies, which is believed to involve methylation of H3K27. However, the full spectrum of non-histone substrates of PRC2 that might also contribute to PRC2 function is not known. We characterized the target recognition specificity of PRC2 and used the resultant data to screen for novel potential targets. The RNA polymerase II (Pol II) transcription factor, Elongin A (EloA), is methylated by PRC2 in vivo. Mutation of the methylated EloA residue decreased repression of many, but not all, PRC2 target genes as measured by both steady state and nascent RNA levels. We propose that PRC2 regulates transcription of a subset of target genes in part via methylation of EloA. Overall design: We examined the transcripitonal profile of EEDnull, EloAnull, EloA mutant, and parental mouse embryonic stem cells by RNAseq. Please note that the .bw processed data file was generated from the *mESC replicate samples together and linked to the corresponding *rep1 sample records.
Publication Title
Polycomb Repressive Complex 2 Methylates Elongin A to Regulate Transcription.
Sample Metadata Fields
Specimen part, Subject
View Samples- Mus musculus
- 10 Downloadable Samples
- Illumina HiSeq 2500
Description
Polycomb repressive complex 2 (PRC2-EZH2) methylates histone H3 at lysine 27 (H3K27) and is required to maintain gene repression during development. Misregulation of PRC2 is linked to a range of neoplastic malignancies, which is believed to involve methylation of H3K27. However, the full spectrum of non-histone substrates of PRC2 that might also contribute to PRC2 function is not known. We characterized the target recognition specificity of PRC2 and used the resultant data to screen for novel potential targets. The RNA polymerase II (Pol II) transcription factor, Elongin A (EloA), is methylated by PRC2 in vivo. Mutation of the methylated EloA residue decreased repression of many, but not all, PRC2 target genes as measured by both steady state and nascent RNA levels. We propose that PRC2 regulates transcription of a subset of target genes in part via methylation of EloA. Overall design: We examined the nascent transcripiton profile of mES cells by adding 5-Bromouridine (BrU) to the media for 10 min. Following RNA isolation, BrU-labelled nascent RNA species were affinity purified using BrdU antibody and sequenced after library preparation. Please note that each .bw file was generated from two replicate samples together and linked to the corresponding *rep1 sample records.
Publication Title
Polycomb Repressive Complex 2 Methylates Elongin A to Regulate Transcription.
Sample Metadata Fields
Specimen part, Subject
View Samples- Danio rerio
- 20 Downloadable Samples
- IlluminaHiSeq2000
Description
Subclassification of lymphoid neoplasms is often based on the presumed cell of origin based on T and B progenitor gene expression and the effect of cell lineage on influencing functional characteristics such as aggression and self-renewal capacity is largely unknown, accounted for in part, by lack of experimental models to address these questions. Here, we have used transgenic zebrafish to create the first models of Myc-induced B-ALL and mixed phenotypic B/T-ALL, opening new avenues for studying the these leukemias in the zebrafish. Our work has utilized syngeneic strain zebrafish, limiting dilution cell transplantation, and the widely reported rag2-Myc transgenic model to provide new understanding of how strain differences can underlie leukemia onset in the zebrafish model. Even more importantly, our work now for the first time, has allowed assessment of cell lineage on dictating aggression and leukemia stem cell frequency independent of the underlying oncogenic driver. In total, our work uncoveres that T-ALLs are more aggressive and have higher numbers of leukemia stem cells when compared with B-ALL and mixed phenotypic ALL. Furthermore, analysis of our biphenotypic B/T-ALL suggests that B cell pathways lock cells in less aggressive and lower stem cell fates and are dominant in regulating these processes when T cell pathways are co-regulated within ALL cells. Overall design: The goal of our study is to determine the transcriptional profiles of high and low self-renewing capacity tumors. 20 samples total: 11 unique samples (9 samples with biological replicates), 6 high self-renewing tumors (>1% cells could initiate leukemia) and 5 low self-renewing tumors (<1% of cells could initiate leukemia).
Publication Title
Cell of origin dictates aggression and stem cell number in acute lymphoblastic leukemia.
Sample Metadata Fields
No sample metadata fields
View Samples- Mus musculus
- 20 Downloadable Samples
Affymetrix Mouse Gene 1.0 ST Array (mogene10st)
Description
X-chromosome aneuploidies have long been associated with human cancers, but causality has not been established. In mammals, X-chromosome inactivation (XCI) is triggered by Xist RNA to equalize gene expression between the sexes. Here we delete Xist in the blood compartment of mice and demonstrate that mutant females develop a highly aggressive myeloproliferative neoplasm and myelodysplastic syndrome (mixed MPN/MDS) with 100% penetrance. Significant disease components include primary myelofibrosis, leukemia, histiocytic sarcoma, and vasculitis. Xist-deficient hematopoietic stem cells (HSC) show aberrant maturation and age-dependent loss. Reconstitution experiments indicate that MPN/MDS and myelofibrosis are of hematopoietic rather than stromal origin. We propose that Xist loss results in X-reactivation and consequent genome-wide changes that lead to cancer, thereby causally linking the X-chromosome to cancer in mice. Thus, Xist RNA is not only required to maintain XCI but also suppresses cancer in vivo.
Publication Title
Xist RNA is a potent suppressor of hematologic cancer in mice.
Sample Metadata Fields
Sex, Age, Specimen part
View Samples- Mus musculus
- 6 Downloadable Samples
- Illumina HiSeq 2500
Description
Master regulatory genes require stable silencing by the Polycomb-Group (PcG) to prevent improper expression during differentiation and development. Some PcG proteins covalently modify histones, which contributes to heritable repression. The role for other effects on chromatin structure is less understood. We characterized the organization of PcG target genes in mouse ES cells and neural progenitors using high-resolution 5C technology and super-resolution microscopy. The genomic loci of repressed PcG target genes formed discrete, small domains of tight interaction that corresponded to locations bound by canonical Polycomb Repressive Complex 1 (PRC1). These domains changed during differentiation as PRC1 binding changed. Their formation depended upon the Polyhomeotic component of canonical PRC1, and occurred independently of PRC1-catalyzed ubiquitylation. PRC1 domains differ from topologically associating domains in numerous aspects . These domains have the potential to play a key role in transmitting epigenetic silencing of PcG targets by linking PRC1 to formation of a repressive higher order structure. Overall design: RNA-Seq was performed to compare gene expression of in vitro derived NPC and Phc1 knock-out mESC with wild type ESC. Experiments were performed in dupicates. 50base single end sequencing was performed on Illumina HiSeq2000. Reference genome is mm9.
Publication Title
Polycomb Repressive Complex 1 Generates Discrete Compacted Domains that Change during Differentiation.
Sample Metadata Fields
Specimen part, Cell line, Subject
View Samples- Caenorhabditis elegans
- 9 Downloadable Samples
- Affymetrix C. elegans Genome Array (celegans)
Description
Many pathogens secrete toxins that target key host processes resulting in the activation of immune pathways. The secreted Pseudomonas aeruginosa toxin Exotoxin A (ToxA) disrupts intestinal protein synthesis which triggers the induction of a subset of P. aeruginosa-response genes in the nematode Caenorhabditis elegans. We found that losing one ToxA-induced C. elegans gene, the Tribbles pseudokinase ortholog nipi-3, results in hypersusceptibility to both P. aeruginosa and ToxA. We determined that NIPI-3 mediates the post-developmental expression of intestinal immune genes and proteins and primarily functions in parallel to known immune pathways, including p38 PMK-1 MAPK signaling. Here we present the microarray data that was used to determine that (1) nipi-3 regulates immune gene expression and that (2) nipi-3 and pmk-1 regulate non-overlapping gene sets consistent with them functioning in parallel.
Publication Title
Tribbles ortholog NIPI-3 and bZIP transcription factor CEBP-1 regulate a Caenorhabditis elegans intestinal immune surveillance pathway.
Sample Metadata Fields
Specimen part
View Samples- Homo sapiens
- 6 Downloadable Samples
- Illumina HiSeq 2500
Description
Celiac disease (CeD) is an intestinal immune-mediated disorder caused by gluten ingestion in genetically predisposed subjects. CeD is characterized by villous atrophy, altered intestinal permeability, crypt hyperplasia and innate and adaptive immune response. This study aimed to develop and validate the use of intestinal organoids from celiac patients to study CeD. A repository of organoids from duodenum of non-celiac and celiac patients was generated and characterized accordingly to standard procedures. RNA-seq analysis was employed to study the global gene expression program of CeD (n=3) and non-CeD (n=3) organoids sets. While the three celiac derived organoids shared similar transcriptional signatures the NC samples set appeared more heterogeneous. We found 486 genes differentially expressed between the two groups. Of them, 299 genes were downregulated (FC<2; FDR<0.05) and 187 were upregulated in CeD (FC >2; FDR<0.05). We observed CeD organoids had significantly altered expression of genes associated with barrier function, innate immunity, and stem cell function. Overall design: mRNA profiles of 3 non-celiac healthy controls and 3 celiac organoids derived from duodenal biopsies.
Publication Title
Human gut derived-organoids provide model to study gluten response and effects of microbiota-derived molecules in celiac disease.
Sample Metadata Fields
Specimen part, Disease, Subject
View Samples- Drosophila melanogaster
- 6 Downloadable Samples
- Illumina HiSeq 2000
Description
Chromatin in eukaryotic nuclei is organized at multiple scales, from individual nucleosomes to specific loops between regulatory sequences, to the folding of large genomic regions into topological domains and segregation of whole chromosomes into territories. Many of the chromatin proteins that regulate this architecture, including the essential Polycomb Group (PcG) proteins, are themselves organized into subnuclear structures. Deciphering mechanistic links between protein organization and genome architecture requires precise description and mechanistic perturbations of both. Using super-resolution microscopy, we characterized the nanoscale organization of PcG proteins in Drosophila cells and find hundreds of small protein clusters, distinct from the large PcG bodies present in just a few copies per cell that have been the focus of previous investigations. We manipulated PcG clusters either by disrupting the polymerization activity of the conserved Sterile Alpha Motif (SAM) of the PcG protein Polyhomeotic (Ph) or increasing Ph levels in Drosophila S2 cells. Disrupting clustering using Ph SAM mutations disrupts chromatin interactions on scales from 50kb to 13Mb while increasing Ph levels increases both cluster number and long range chromatin interactions. RNA-seq and qPCR indicate that both perturbations also alter expression levels of many genes. Molecular simulations suggest a model in which PcG cluster formation on chromatin is governed by the kinetics of association between Ph SAMs and PcG cluster size is bounded by the affinity and occupancy of chromatin binding sites. Our results suggest that nanoscale organization of PcG proteins into small, abundant clusters on chromatin through the polymerization activity of Ph SAM shapes genome architecture by mediating numerous long-range chromatin interactions. Overall design: Two biological replicates of three RNA-seq samples from S2 cells, cells overexpresing wild-type Ph, and cells overexpressing polymerization defective Ph-ML
Publication Title
Chromatin topology is coupled to Polycomb group protein subnuclear organization.
Sample Metadata Fields
Cell line, Subject
View Samples- Mus musculus
- 32 Downloadable Samples
- Illumina HiSeq 2500
Description
Cellular reprogramming converts differentiated cells into induced pluripotent stem cells (iPSCs). However, this process is extremely inefficient, complicating mechanistic studies. Here, we identified and molecularly characterized rare, early intermediates poised to reprogram with up to 100% efficiency, without perturbing additional genes or pathways. Analysis of these cells uncovered transcription factors (e.g., Tfap2c, Bex2), which are critical for reprogramming but dispensable for pluripotency maintenance. Additionally, we observed striking patterns of chromatin hyperaccessibility at pluripotency loci, which preceded gene expression in poised intermediates. Finally, inspection of these hyperaccessible regions revealed a previously unappreciated early wave of DNA demethylation, which is uncoupled from de novo methylation of somatic regions late in reprogramming. Overall, our study underscores the importance of investigating the rare intermediates poised to produce iPSCs, provides novel insights into the mechanisms of reprogramming, and offers a valuable resource for the dissection of transcriptional and epigenetic dynamics intrinsic to cell fate change. Overall design: RNA-seq of reprogramming intermediates (11 cell types in triplicate).
Publication Title
Prospective Isolation of Poised iPSC Intermediates Reveals Principles of Cellular Reprogramming.
Sample Metadata Fields
Specimen part, Cell line, Subject
View Samples- Mus musculus
- 25 Downloadable Samples
- Illumina HiSeq 2000
Description
We determined by RNA-seq gene expression changes in mESCs following the induced expression of WT-, KRA- or DEA-CBX2 variants in Cbx2 null cells. Overall design: We generated mRNA profiles from 5 mESC lines (2 WT, 2 KRA, 1 DEA) treated with doxycycline to express similar levels of CBX2, and, from a 6th condition where one of the KRA mESC lines was treated with more doxycycline. Each sample was compared to its own control, which is no doxycycline treatment, to determine the effect of induced CBX2 on gene expression changes. Each sample (with and without doxycycline treatment) was performed with 2 or 3 biological replicates.
Publication Title
Mutation of a nucleosome compaction region disrupts Polycomb-mediated axial patterning.
Sample Metadata Fields
Specimen part, Subject
View Samples