HSF1 Mouse Fibroblast Heat Shock - Scanner7
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE3074 | GEO | 2005/08/05
SECONDARY ACCESSION(S): PRJNA93073
REPOSITORIES: GEO
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Project description:Mouse HSF1+/+ and HSF1-/- Fibroblasts Heat Shock Time Courses Scanned on Scanner 7 (Axon 4000B)
2005-07-21 | E-SMDB-1853 | biostudies-arrayexpress
Project description:Subjects are children from Kilifi District Hospital, Kenya, recruited in 2001 malaria season. total RNA extracted from PaxGene tubes, total RNA and Stratagene Universal reference RNA underwent linear amplification (Message Amp, Ambion). Amplified RNA directly labelled Cy5 and Cy3 and hybridised to 'lymphochip' arrays (print run - lc36n). Scanned on Axon 4000B scanner using GenePix 4.0 software. Clinical sample ID provided in 'Disease State Description' corresponds with Sample ID in Table 1 "Clinical Information for the micro-array samples" in the associated publication. A disease state experiment design type is where the state of some disease such as infection, pathology, syndrome, etc is studied. Keywords: disease_state_design
2005-07-09 | GSE2900 | GEO
Project description:HSF1 binds DNA via the DBD domain, causing gene upregulation during HS. We assessed the effect of RD-mediated phase separation on chromatin targeting of HSF1 using Cut&Tag followed by high-throughput sequencing to map genome-wide binding of LLPS-competent versus LLPS-incompetent HSF1 mutants under both HS and NHS conditions. Comparing with WT HSF1 under NHS, both WT under HS and M1 under NHS showed increased and broad binding to enhancers and distal intergenic region, with binding most enriched in expected motifs of HSF-related transcription factors. To further assess the role for IDR-induced LLPS in chromatin targeting of HSF1, we used several additional strategies. First, the treatment of 1,6-hexanediol markedly decreased chromatin occupancy both of WT under HS and M1 under NHS conditions. Second, we interrogate chromatin binding of LLPS-deficient mutant M3. Cut&Tag analysis revealed that M3 showed decreased chromatin binding compared to WT under HS and M1 under NHS. The decreased chromatin binding of M3 to chromatin was not due to the loss of its DNA binding ability, as the EMSA assay revealed that M3 was still capable of binding HSE. Instead, the decreased chromatin binding reflects the loss of inter-molecular interaction between HSF1 that holds LLPS. Furthermore, M3 in heat shocked cells shows similar reduced genomic targeting and shallow binding pattern as NHS cells . Third, the enrichment of transcriptional apparatus RNA Pol II, CYCT1, BRD4 to HSF1 target genes also depend on whether HSF1 can phase separate at these sites. Lastly, we conducted live cell single molecule imaging to evaluate chromatin binding kinetics of LLPS-deficient mutant M3 relative to WT HSF1. Measurements of single molecule displacement and diffusion coefficient showed M3 to be significantly more mobile than WT under HS, which suggests M3 was less confined within phase-separated puncta compared with LLPS-competent HSF1. Consistent with this result, super resolution imaging of M3 also showed decreased cluster formation at HSP gene foci but maintained nSBs formation. Altogether, LLPS-forming capability of HSF1 is essential for the efficient recruitment of HSF1 and transcriptional apparatus to HSP gene loci.
2021-12-24 | GSE192370 | GEO
Project description:Heat shock factor 1 (HSF1) is a key regulator of transcriptional responses to proteotoxic stress. It has been recently linked to signaling of estrogen via ESR1. To study the cooperation of HSF1 and ESR1 in the transcriptional response to estrogen, we established estrogen receptor (ER)-positive breast cancer cell lines with reduced HSF1 levels using specific shRNA or CRISPR/Cas9 approach. HSF1 deficiency led to the inhibition of the mitogenic effect of estrogen in MCF7 and T47D cells. RNA-seq analyses revealed that the stimulatory effect of E2 on the transcriptome was smaller in HSF1-deficient MCF7 cells. This could partially result from the higher basal expression of E2-dependent genes in these cells as a consequence of the enhanced binding of unliganded ESR1 to chromatin, which was revealed by ChIP-seq analyses. Thus, we postulate that some fraction of ESR1 could be released from the inhibitory complex with HSP90 and gain transcriptional competence without E2-stimulation.
2021-12-18 | GSE186004 | GEO
Project description:We investigated whether interfering with HSF1 LLPS affected the expression of its target genes using RNA sequencing. We found HS induced HSPs gene expression in LLPS-dependent manner. LLPS-dependent gene activation was also observed in M1 cells under NHS condition. In addition, LLPS-incompetent M3 infected cells showed less HSP gene expression even under HS condition. Thus, these data collectively support a crucial role for LLPS of HSF1 in activating HSP genes expression.
2021-12-19 | GSE191134 | GEO
Project description:Upon heat shock, Hsf1 protein is extensively phosphorylated, however, this modification is inhibited by an hsf1-bal mutation. To get genome-wide effect of the hyperphosphorylation on Hsf1-regulated transcription, the heat-induced gene expression profiles in HSF1 and hsf1-bal cells were compared. Keywords: stress response
2005-09-27 | GSE3361 | GEO
Project description:The heat shock response is a universal transcriptional response to proteotoxic stress orchestrated by heat shock transcription factor Hsf1 in all eukaryotic cells. Despite over 40 years of intense research, the mechanism of HSF1 activity regulation remains poorly understood at a molecular level. In metazoa Hsf1 trimerizes upon heat shock through a leucin-zipper domain and binds to DNA. How Hsf1 is dislodged from DNA and monomerized remained enigmatic. Here, using purified proteins we demonstrate that unmodified trimeric Hsf1 is dissociated from DNA in vitro by Hsc70 and DnaJB1. Hsc70 binds to multiple sites in Hsf1 with different affinities. Hsf1 trimers are monomerized by successive cycles of entropic pulling, unzipping the triple leucinezipper. Starting this unzipping at several protomers of the Hsf1 trimer results in faster monomerization. This process directly monitors the concentration of Hsc70 and DnaJB1. During heat shock adaptation Hsc70 first binds to a high affinity site in the transactivation domain leading to partial attenuation of the response and subsequently, at higher concentrations, Hsc70 removes Hsf1 from DNA to restore the resting state.
2020-06-22 | PXD017406 | Pride
Project description:Heat shock transcription factors HSF1 and HSF2 both are necessary for proper spermatogenesis, which is disrupted at elevated temperatures. We studied how HSF1 and HSF2 cooperate during the heat shock response in mouse spermatocytes. For this purpose we used ChIP-sequencing. ChIP-Seq analyses revealed that the temperature elevation induces remodeling of HSF1 and HSF2 binding to chromatin. The highest HSF1-chromatin binding was observed at 43°C, when HSF2-chromatin binding was reduced. Many promoters (mainly Hsp genes) were occupied by both heat shock factors at physiological temperature of testes and/or at 38°C. In contrary at 43°C only HSF1 was bound. Obtained results suggest that HSF1 and HSF2 could cooperate in regulation of the transcription of some genes only at physiological temperatures and/or at 38°C. Alteration in HSFs interactions and their binding to chromatin could be one of the reason of increased spermatogenic cell death observed after heat shock.
2014-10-07 | GSE56735 | GEO
Project description:Thermotolerance is a crucial virulence attribute for Cryptococcus neoformans, which causes fatal fungal meningitis in humans. A protein kinase, Sch9, suppresses the thermotolerance of C. neoformans but its regulatory mechanism remains unknown. Here we elucidated the Sch9-dependent and -independent signaling networks for modulating the thermotolerance of C. neoformans through a genome-wide transcriptome analysis and reverse genetics approaches. We found that more than 1,800 genes were under transcriptional control during temperature upshift. Genes encoding for molecular chaperones and heat shock proteins were mainly upregulated, while those for translation, transcription, and sterol biosynthesis were highly suppressed. In this process Sch9 was found to regulate basal or induced expression levels of some temperature-responsive genes. Interestingly we found that Sch9 was involved in transcriptional regulation of the Ire1 kinase, which is a key sensor for the unfolded protein response pathway, and was found to be involved in ER stress response. Most notably, our data demonstrated that expression of HSF1, encoding a heat shock transcription factor 1, was downregulated during temperature upshift and Sch9 suppresses its downregulation. In spite of such expression patterns, Hsf1 was essential for growth and its overexpression indeed promoted the thermotolerance of C. neoformans, suggesting dual roles of Hsf1 in thermotolerance. This idea was supported by additional transcriptome analysis with HSF1 overexpression strain, which revealed that Hsf1 served as both activator and repressor. Hsf1 promoted genes such as Hsp104 and Hsp70 (Ssa1 and Ssa2), both of which were found to be highly upregulated during temperature upshift and required for thermotolerance, while Hsf1 repressed genes involved in oxidative stress and thermotolerance.
2015-06-01 | GSE66509 | GEO
Project description:Heat shock transcription factors HSF1 and HSF2 both are necessary for proper spermatogenesis, which is disrupted at elevated temperatures. We studied how HSF1 and HSF2 cooperate during the heat shock response in mouse spermatocytes. For this purpose we used ChIP-sequencing. ChIP-Seq analyses revealed that the temperature elevation induces remodeling of HSF1 and HSF2 binding to chromatin. The highest HSF1-chromatin binding was observed at 43M-BM-0C, when HSF2-chromatin binding was reduced. Many promoters (mainly Hsp genes) were occupied by both heat shock factors at physiological temperature of testes and/or at 38M-BM-0C. In contrary at 43M-BM-0C only HSF1 was bound. Obtained results suggest that HSF1 and HSF2 could cooperate in regulation of the transcription of some genes only at physiological temperatures and/or at 38M-BM-0C. Alteration in HSFs interactions and their binding to chromatin could be one of the reason of increased spermatogenic cell death observed after heat shock. On Illumina platform we sequenced DNA immunoprecipitated from isolated spermatocytes using anti-HSF1 antibody or anti-HSF2 antibody. Cells were either untreated (control) or heat shocked for 5-20 minutes. Two PCR-verified ChIP replicates were collected per each sample, and three negative control samples with normal goat serum were included.
2014-10-07 | E-GEOD-56735 | biostudies-arrayexpress