This SuperSeries is composed of the SubSeries listed below.
A core erythroid transcriptional network is repressed by a master regulator of myelo-lymphoid differentiation.
Specimen part, Cell line
View SamplesWe compared the transcriptomes of differentiating cultures of ES cell derived erythroid progentor cells (ES-EP) and murine erythroleukemia (MEL) cells stably transfected with GATA-1 fused to ER.
A core erythroid transcriptional network is repressed by a master regulator of myelo-lymphoid differentiation.
Specimen part, Cell line
View SamplesIn this study, we set out to identify those molecular features of the POU transcription factor Oct4 that are responsible for inducing pluripotency in somatic cells. Oct4 is known to have a strong preference to cooperate with Sox2 on heterodimeric SoxOct elements predominantly found in enhancers of genes expressed in embryonic stem cells (ESCs). To test whether this partnership is specific to Oct4, we compared its DNA recognition and reprogramming activities to the paralogous transcription factor Oct6, which cannot induce and maintain pluripotency in mouse cells. By analyzing ChIP-Seq data and performing quantitative dimerization assays, we found that in somatic cells, instead of heterodimerzing with Sox-factors, Oct6 more potently homodimerizes on OctOct elements. We identified that a single amino acid is crucial in directing binding to the respective composite DNA element. As a consequence, just changing this one amino acid hampers Oct4 in generating induced pluripotent stem cells (iPSCs). In contrast, the reverse mutation in Oct6 did not augment its reprogramming activity. This was achieved with at least two additional exchanges. In summary, we demonstrate that cell-type specific POU factor function is determined by a limited set of residues that affect DNA and partner factor interactions. Such relatively minor changes lead to a pronounced impact on regulatory function and reprogramming activity.
Changing POU dimerization preferences converts Oct6 into a pluripotency inducer.
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View SamplesThis SuperSeries is composed of the SubSeries listed below.
Novel subtype-specific genes identify distinct subpopulations of callosal projection neurons.
Specimen part
View SamplesMyocardial infarction (MI) often results in left ventricular (LV) remodeling followed by heart failure (HF). It is of great clinical importance to understand the molecular mechanisms that trigger transition from compensated LV injury to HF and to identify relevant diagnostic biomarkers. In this study, we performed transcriptional profiling of LVs in rats with a wide range of experimentally induced infarct sizes and of peripheral blood mononuclear cells (PBMCs) in animals that developed HF.
Transcriptional profiling of left ventricle and peripheral blood mononuclear cells in a rat model of postinfarction heart failure.
Specimen part
View Samples3 subtypes of cortical projection neurons were purified by fluorescence-activated cell sorting (FACS) at 4 different stages of development from mouse cortex. A detailed description of the data set is described in Arlotta, P et al (2005) and Molyneaux, BJ et al (2009). The hybridization cocktails used here were originally applied to the Affymetrix mouse 430A arrays and submitted as GEO accession number GSE2039. The same hybridization cocktails were then applied to the Affymetrix mouse 430 2.0 arrays, and those data are contained in this series.
Novel subtype-specific genes identify distinct subpopulations of callosal projection neurons.
Specimen part
View SamplesM cells are the main site of bacterial translocation in the intestine. We used the in vitro M cell model to study the effect of the commensal bacteria; Lactobacillus salivarius, Eschericha coli and Bacteroides fragilis, on M cell gene expression.
Differential intestinal M-cell gene expression response to gut commensals.
Specimen part, Treatment
View SamplesMutations of the transcriptional regulator Mecp2 cause the X-linked autism spectrum disorder Rett syndrome (RTT), and Mecp2 has been implicated in several other neurodevelopmental disorders. To identify potential target genes regulated directly or indirectly by MeCP2, we performed comparative gene expression analysis via oligonucleotide microarrays on Mecp2-/y (Mecp2-null) and wild-type CPN purified via fluorescence-activated cell sorting (FACS).
Reduction of aberrant NF-κB signalling ameliorates Rett syndrome phenotypes in Mecp2-null mice.
Specimen part
View SamplesExpression data from Kc167 cells under normal conditions. Used to assess expression levels of genes with ORC bound at promoter.
Drosophila ORC localizes to open chromatin and marks sites of cohesin complex loading.
Cell line
View SamplesInfluenza A virus has a broad cellular tropism in the respiratory tract. Infected epithelial cells sense the infection and initiate an antiviral response. To define the antiviral response at the earliest stages of infection we used two different single cycle replication reporter viruses. These tools demonstrated heterogeneity in virus replication levels in vivo. Transcriptional profiling demonstrated tiers of interferon stimulated gene responses that were dependent on the magnitude of virus replication. Uninfected cells and cells with blunted replication expressed a distinct and potentially protective ISG signature. Finally, we used these single cycle reporter viruses to determine the antiviral landscape during virus spread, which unveiled disparate protection mediated by IFN. Together these results highlight the complexity of virus-host interactions within the infected lung and suggest that magnitude and round of replication tune the antiviral response. Overall design: Mice were infected with 10^5 pfu of the indicated virus. Lungs from infefected C57BL/6 were taken at 24 hours post infection. Single cell suspensions were sorted for live CD45-CD31- and the indicated virus-driven fluorophore. Cells were FACS sorted directly into cell lysis buffer for RNA extraction. cDNA libraries were prepared using the SMARTer Universal Low Input RNA Kit (Takara Bio). SAmples were then profiled by illumina sequencing
Distinct antiviral signatures revealed by the magnitude and round of influenza virus replication in vivo.
Specimen part, Cell line, Subject
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