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SRP079916
Homo sapiens
26 Downloadable Samples
NextSeq 500
Description
The unprecedented magnitude of the 2013-2016 Makona Ebola virus (M-EBOV) epidemic likely resulted from multiple epidemiologic factors that set it apart from previous outbreaks. Nonetheless, genetic adaptations that distinguish M-EBOV from previous isolates may also have contributed to the scale of the epidemic. Of particular interest is a M-EBOV glycoprotein (GP) variant, GP-A82V, that was first detected at the inflection point of the 2013-2016 outbreak - when the number of cases increased exponentially - and which completely supplanted the earlier M-EBOV sequence. We found that, as compared with the earlier strain, GP-A82V increased the ability of M-EBOV to fuse with and infect cells of primate origin, including human blood dendritic cells, without altering innate immune signaling in target cells. Residue 82 is located at the NPC1-binding site on M-EBOV GP and the increased infectivity of GP-A82V was restricted to cells from species in which the NPC1 orthologue bears primate-defining residues at the critical interface. We utilized HIV-derived lentiviral vectors pseudotyped with founder and A82V containing M-EBOV GPs to explore the potential that this modification alters how human monocyte-derived dendritic cells (MDDCs) respond to EBOV GP stimulation. Overall design: We generated stocks of lentiviral vector bearing one the following three M-EBOV GPs: founder, A82V, and A82V/T230A. These viral stocks were used to challenge MDDCs from two healthy, anonymous human donors. Stimulated MDDCs were harvested at 1, 2, 4, and 6 hours after viral addition. Gene expression in M-EBOV GP challenged MDDCs was compared to a unstimulated control.
Publication Title
Ebola Virus Glycoprotein with Increased Infectivity Dominated the 2013-2016 Epidemic.
Sample Metadata Fields
Specimen part, Subject
View Samples- Homo sapiens
- 7 Downloadable Samples
- IlluminaHiSeq2500
Description
Human transcripts can typically be processed at multiple polyadenylation sites to yield mRNA isoforms with distinct 3 ends. A multitude of factors contributes to the choice of individual polyadenylation sites in different cell types and tissues. In this study we have found that the heterogenous ribonucleoprotein C (hnRNP C), an RNA binding protein that was previously linked to splicing and polyadenylation at Alu repeat elements, is a general regulator of pre-mRNA cleavage and polyadenylation. By sequencing mRNA 3 ends from cells expressing normal and reduced levels of hnRNP C we found that transcripts that contain poly(U) tracts around their poly(A) sites respond in a manner indicative of hnRNP C repressing cleavage and polyadenylation. The 3 UTR isoforms whose abundance is modulated by hnRNP C contain U-rich elements and can thereby interact with A/U-rich element binding proteins that have been shown to alter transcript stability, sub-cellular localization and even the localization of the translated proteins.
Publication Title
A comprehensive analysis of 3' end sequencing data sets reveals novel polyadenylation signals and the repressive role of heterogeneous ribonucleoprotein C on cleavage and polyadenylation.
Sample Metadata Fields
No sample metadata fields
View Samples- Escherichia coli
- 3 Downloadable Samples
Affymetrix E. coli Genome 2.0 Array (ecoli2)
Description
Transcriptional analysis of the effects of the deletion of the sRNAs glmY and glmZ in EHEC
Publication Title
Global analysis of posttranscriptional regulation by GlmY and GlmZ in enterohemorrhagic Escherichia coli O157:H7.
Sample Metadata Fields
No sample metadata fields
View Samples- Mus musculus
- 3 Downloadable Samples
- Affymetrix Mouse Gene 1.0 ST Array (mogene10st)
Description
The adult pancreas is capable of limited regeneration after injury, but has no defined stem cell population. The cell types and molecular signals that govern the production of new pancreatic tissue are not well understood. Here we show that inactivation of the SCF-type E3 ubiquitin ligase substrate recognition component Fbw7 induces pancreatic ductal cells to reprogram into -cells. The induced -cells resemble islet -cells in morphology and histology, express genes essential for -cell function, and release insulin upon glucose challenge. Thus, loss of Fbw7 appears to reawaken an endocrine developmental differentiation program in adult pancreatic ductal cells. Our study highlights the plasticity of seemingly differentiated adult cells, identifies Fbw7 as a master regulator of cell fate decisions in the pancreas, and reveals adult pancreatic duct cells as a latent multipotent cell type.
Publication Title
Loss of Fbw7 reprograms adult pancreatic ductal cells into α, δ, and β cells.
Sample Metadata Fields
Specimen part, Treatment
View Samples- Mus musculus
- 18 Downloadable Samples
- NextSeq 500
Description
mRNA-sequencing from ribosomal RNA-depleted cardiac total RNA was performed 9 weeks after injection of rAAV6-PLCb1a, rAAV6-PLCb1b or rAAV6-blank viri into the tail vein of C57BL/6 male mice (7-8 weeks of age at time of injection). Overall design: 6 biological replicates each of rAAV6-PLCb1a, rAAV6-PLCb1b or rAAV6-blank-treated mice.
Publication Title
Chronic Contractile Dysfunction without Hypertrophy Does Not Provoke a Compensatory Transcriptional Response in Mouse Hearts.
Sample Metadata Fields
Sex, Age, Specimen part, Cell line, Subject
View Samples- Homo sapiens
- 6 Downloadable Samples
- Illumina HiSeq 2000
Description
In eukaryotes, the 3'' ends of RNA polymerase II-generated transcripts are made in the majority of cases by site-specific endonucleolytic cleavage, followed by the addition of a poly(A) tail. By alternative polyadenylation, a gene can give rise to multiple mRNA isoforms that differ in the length of their 3'' UTRs and hence in their susceptibility to post-transcriptional regulatory factors such as microRNAs. A series of recently conducted high-throughput studies of poly(A) site usage revealed an extensive tissue-specific control of 3’ UTR length and drastic changes in 3’ UTR length of mRNAs upon induction of proliferation in resting cells. To understand the dynamics of polyadenylation site usage, we recently identified binding sites of the major pre-mRNA 3’ end processing factors - cleavage and polyadenylation specificity factor (CPSF), cleavage stimulation factor (CstF), and cleavage factor Im (CF Im) - and mapped cleaved polyadenylation sites in HEK293 cells. Our present study extends previous findings on the role of CF Im in alternative polyadenylation and reveals that subunits of the CF Im complex generally control 3’ UTR length. More specifically, we demonstrate that the loss-of-function of CF Im68 and CF Im25 but not of CF Im59 leads to a transcriptome-wide increase of the use of proximal polyadenylation sites. Overall design: 3'' ends of transcripts were profiled by high-throughput sequencing in HEK 293 cells under normal conditions, and in HEK 293 cells depleted of 3'' end processing factors CF Im25, CF Im59, and CF Im68.
Publication Title
Cleavage factor Im is a key regulator of 3' UTR length.
Sample Metadata Fields
Cell line, Subject
View Samples- Homo sapiens
- 5 Downloadable Samples
- Illumina HiSeq 2000
Description
The RNA helicase UPF1 is best known for its key function in mRNA nonsense-mediated mRNA decay (NMD), but has also been implicated in additional mRNA turnover mechanisms, telomere homeostasis, and DNA replication. In NMD, UPF1 recruitment to target mRNAs is thought to occur through interaction with release factors at terminating ribosomes, but evidence for translation-independent interaction of UPF1 with the 3’ untranslated region (UTR) of mRNAs has also been reported. To map UPF1 binding sites transcriptome-wide, we performed individual-nucleotide resolution UV crosslinking and immunoprecipitation (iCLIP) in human cells, untreated or after inhibiting translation by puromycin. We found a strong association of UPF1 with 3’ UTRs in undisturbed, translationally active cells and a significant increase in UPF1 binding to coding sequence (CDS) after translation inhibition. These results indicate that UPF1 binds RNA before translation and gets displaced from the CDS by translating ribosomes. This evidence for translation-independent UPF1-RNA interaction, which is corroborated by RNA immunoprecipitations experiments and by our observation that UPF1 also crosslinks to long non-coding RNAs, suggests that the decision to trigger NMD occurs after association of UPF1 with the mRNA, presumably through activation of RNA-bound UPF1 by aberrant translation termination. Overall design: Examination of Upf1 binding preferences via iCLIP in untreated HeLa cells and HeLa cells, where translation is blocked by puromycin treatment in vivo crosslinking and immunoprecipitation strategy (iCLIP)
Publication Title
Translation-dependent displacement of UPF1 from coding sequences causes its enrichment in 3' UTRs.
Sample Metadata Fields
Cell line, Subject
View Samples- Homo sapiens
- 4 Downloadable Samples
- Illumina HiSeq 2000
Description
Through alternative polyadenylation, human mRNAs acquire longer or shorter 3'' untranslated regions, the latter typically associated with higher transcript stability and increased protein production. To understand the dynamics of polyadenylation site usage, we mapped transcriptome-wide both binding sites of 3'' end processing factors CPSF-160, CPSF-100, CPSF-73, CPSF-30, Fip1, CstF-64, CstF-64tau, CF Im25, CF Im59, and CF Im68 and 3'' end processing sites in HEK293 cells. We found that although binding sites of these factors generally cluster around the poly(A) sites most frequently used in cleavage, CstF-64/CstF-64tau and CF Im proteins have much higher positional specificity compared to CPSF components. Knockdown of CF Im68 induced a systematic use of proximal polyadenylation sites, indicating that changes in relative abundance of a single 3'' end processing factor can modulate the length of 3'' untranslated regions transcriptome-wide, and suggesting a mechanism behind the previously observed increase in tumor cell invasiveness upon CF Im68 knockdown. Overall design: 3'' ends of transcripts were profiled by high-throughput sequencing in HEK 293 cells under normal conditions, and in HEK 293 cells depleted of 3'' end processing factors CF Im 68 and CstF-64.
Publication Title
Genome-wide analysis of pre-mRNA 3' end processing reveals a decisive role of human cleavage factor I in the regulation of 3' UTR length.
Sample Metadata Fields
Cell line, Subject
View Samples- Escherichia coli
- 2 Downloadable Samples
- Affymetrix E. coli Genome 2.0 Array (ecoli2)
Description
Bacterial pathogens must be able to both recognize suitable niches within the host for colonization and successfully compete with commensal flora for nutrients in order to establish infection. Ethanolamine (EA) is a major component of mammalian and bacterial membranes and may be used by pathogens as a carbon and/or nitrogen source in the gastrointestinal tract. We examined how EA influences gene expression in the human pathogen enterohemorrhagic Escherichia coli O157:H7 (EHEC). Our results indicate EA is not only important for nitrogen metabolism, but that EA is used in cell-to-cell signaling to activate virulence gene expression. Genes encoding for the global regulatory proteins QseC, QseE, and QseA, as well as for attaching and effacement (AE) lesion formation and Shiga toxin are differentially regulated when EHEC is grown with micromolar concentrations of EA. We also constructed a deletion of eutR that encodes the regulator of the eut (EA utilization) operon and examined virulence gene expression. These results suggest that EutR is important in regulating gene expression in response to EA, but that EA signaling does not occur solely through EutR. This is the first report linking EA to cell-to-cell signaling and pathogenesis.
Publication Title
Ethanolamine controls expression of genes encoding components involved in interkingdom signaling and virulence in enterohemorrhagic Escherichia coli O157:H7.
Sample Metadata Fields
No sample metadata fields
View Samples- Mus musculus
- 16 Downloadable Samples
- Illumina HiSeq 2000
Description
Brown adipose tissue (BAT) plays an essential role in metabolic homeostasis by dissipating energy via thermogenesis through uncoupling protein 1 (Ucp1). Previously, we reported that the TATA-binding protein Associated Factor 7L (Taf7l) is an important regulator of white adipose tissue (WAT) differentiation. Here, we show that Taf7l also serves as a molecular switch between brown fat and muscle lineages in vivo and in vitro. In adipose tissue, Taf7l containing TFIID complexes associate with PPAR? to mediate DNA looping between distal enhancers and core promoter elements. Our findings suggest that presence of the tissue-specific Taf7l subunit in TFIID functions to promote long-range chromatin interactions during BAT lineage specification. Overall design: mRNA-seq expression profiling wild type and Taf7l knockout interscapular brown adipose tissue (BAT)
Publication Title
TAF7L modulates brown adipose tissue formation.
Sample Metadata Fields
No sample metadata fields
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