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Transcription profiling of Candida albicans wild type and conditional mutant hsf1/TET-HSF1

ABSTRACT: To investigate the role of HSF1 in Candida albicans

ORGANISM(S): Candida albicans

SUBMITTER: AFG AFG

PROVIDER: E-MEXP-1369 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Role of the heat shock transcription factor, Hsf1, in a major fungal pathogen that is obligately associated with warm-blooded animals.

Nicholls Susan S Leach Michelle D MD Priest Claire L CL Brown Alistair J P AJ

Molecular microbiology 20091008 4

All organisms have evolved mechanisms that protect them against environmental stress. The major fungal pathogen of humans, Candida albicans, has evolved robust stress responses that protect it against human immune defences and promote its pathogenicity. However, C. albicans is unlikely to be exposed to heat shock as it is obligatorily associated with warm-blooded animals. Therefore, we examined the role of the heat shock transcription factor (Hsf1) in this pathogen. We show that C. albicans expr ...[more]

PMID: 19818013

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Transcription profiling of Candida albicans wildtype and hsf1 mutant cells after heatstress

Project description:effect of heatstress on wildtype and hsf1 mutant cells

2009-12-17 | E-MEXP-2044 | biostudies-arrayexpress

HX-MS data: Feedback regulation of heat shock factor 1 (Hsf1) activity by Hsp70-mediated trimer unzipping and dissociation from DNA

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

Expression of heat shock factor 1 (HSF1) knock down (KD) in hepatocellular carcinoma (HCC) cells results in characteristic changes in gene expression profiles.

Project description:Analysis of HSF1-down regulation of HCC cells at gene expression level. Results provide important information of genes involved in HSF1, such as liver proliferation, apoptosis, stress response, metabolism, these genes were up- or down-regulated. Total RNA obtained from HSF1-KD KYN2 (HCC) cells and HSF1-control KYN2 cells. To identify genes generally involved in HSF1 associated, we compared expression profiles between HSF1-KD KYN2 (HCC) cells and HSF1-control KYN2 cells by using Illumina HumanWG-6 BeadChip.

2013-06-07 | E-GEOD-47693 | biostudies-arrayexpress

Excess protein synthesis, denatured proteins or molecular crowding spontaneously induce HSF1 trimerisation and activation

Project description:Stress responses are a key feature of normal physiology and are usurped by cancer cells to ensure enhanced protein synthesis for growth, to compensate for genomic instability, and to protect cancer cells from therapy induced stress. Heat shock factor-1 (HSF1) is a major stress-response transcription factor, and its activity is markedly enhanced in cancer. Stress induces HSF1 conformational changes and post-translational modifications, leading to assembly of active HSF1 trimers that bind DNA to control target gene expression. Although the function of HSF1 in transcription is relatively well-known, the mechanisms leading to HSF1 activation and enhanced stress response in tumours are unclear. To investigate whether HSF1 is a primary sensor of proteotoxic stress in vivo, we studied the range of conditions that can cause HSF1 activation in vitro and in cells, and conditions that prevent its activation. We show that purified recombinant HSF1 adopts a stable monomeric conformation in vitro. Heat stress caused a conformational change and the assembly of HSF1 trimers. Conditions leading to protein denaturation, including heat stress, crowding, Hsp90 inhibition, or proteasome inhibition, all directly lead to HSF1 activation. In contrast, HSF1 activation in vivo is prevented by proteosynthesis inhibition, which reduces the amount of denatured proteins in the cell. These results establish that HSF1 is a direct sensor of proteotoxic stress, independent of post-translational modification, where abrupt environmental changes that cause protein denaturation simultaneously induce a conformational change in monomeric HSF1 leading to its activation. This mechanism explains the universal ability of cells to respond to proteotoxic stress and trigger a protective response when increased chaperone activities are required to restore homeostasis.

2024-08-14 | PXD037662 | Pride

Transcription profiling of human heat shocked HeLa cell line with siRNA knockdown of HSF1

Project description:Although HSF1 is known to play an important role in regulating the cellular response to proteotoxic stressors, little is known about the structure and function of the HSF1 signaling network under both stressed and unstressed conditions. In this study, we used a combination of chromatin immunoprecipitation (ChIP) microarray analysis and time course gene expression microarray analysis with and without siRNA-mediated inhibition of HSF1 comprehensively identify genes directly and indirectly regulated by HSF1 and examine the structure of the extended HSF1 signaling network. Correlation between promoter binding and gene expression was not significant for all genes bound by HSF1 suggesting that HSF1 binding per se is not sufficient for expression. However, the correlation with promoter binding was significant for genes identified as HSF1-regulated following siRNA knockdown allowing the identification of direct transcriptional targets of HSF1. Among promoters bound by HSF1 following heat shock, a gene ontology (GO) analysis showed significant enrichment only in categories related to protein folding. In contrast, analysis of the extended HSF1 signaling network showed enrichment in a variety of categories related to protein folding, anti-apoptosis, RNA splicing, ubiquitination and others, highlighting a complex transcriptional program directly and indirectly regulated by HSF1.,SUBMITTER_CITATION: Genome-wide analysis of human HSF1 signaling reveals a transcriptional program linked to cellular adaptation and survival Authors: Todd J. Page, Devanjan Sikder, Longlong Yang, Linda Pluta, Russell D. Wolfinger, Thomas Kodadek, and Russell S. Thomas Journal: Molecular Biosystems 2:627-639

2007-06-22 | E-GEOD-3697 | biostudies-arrayexpress

Genome-wide characterization of HSF1 binding in human 451Lu melanoma cancer cells under basal conditions

Project description:HSF1 orchestrates a transcriptional program vital for cancer cells. In this study we assayed for genome-wide localization of HSF1 enrichment in the 451Lu melanoma in untreated cells. These results revealed a transcriptional program enriched for metastasis-related genes. Twenty million cells were used for the ChIP and precipitated using 5 micrograms of antibody (cell signaling, 4356) against human HSF1

2015-02-20 | E-GEOD-63589 | biostudies-arrayexpress

Genome-wide characterization of HSF1 binding in human WT and FBXW7 KO colon cancer cells under basal conditions and upon heat shock

Project description:FBXW7 modulates stress response by post-translational modification of HSF1 HSF1 orchestrates the heat-shock response upon exposure to heat stress and activates a transcriptional program vital for cancer cells. In this study we assayed for genome-wide localization of HSF1 enrichment in the HCT116 FBXW7 KO colon cells and their wild type counterpart in untreated cells and upon heat shock. These results revealed that accumulation of nuclear HSF1 in FBXW7 KO cells results in rewiring of the HSF1 transcriptional program. Five million cells were used for the ChIP and precipitated using 5 micrograms of antibody (cell signaling, 4356) against human HSF1

2015-02-20 | E-GEOD-57398 | biostudies-arrayexpress

HSF1 and HSF2 interactions with chromatin during the heat shock response in mouse spermatocytes

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

Expression analysis of fully-grown oocyte collected from mouse wild-type, Hsf1 mutant or Hsf2 mutant

Project description:Investigation of whole genome gene expression level changes in oocytes Hsf1-/- or Hsf2-/- compared to wild-type. The mutants analyzed in this study are further described in McMillan DR, Xiao X, Shao L, Graves K, Benjamin IJ. 1998. Targeted disruption of heat shock transcription factor 1 abolishes thermotolerance and protection against heat-inducible apoptosis. J Biol Chem. 273(13):7523-8 and in McMillan DR, Christians E, Forster M, Xiao X, Connell P, Plumier JC, Zuo X, Richardson J, Morgan S, Benjamin IJ. 2002. Heat shock transcription factor 2 is not essential for embryonic development, fertility, or adult cognitive and psychomotor function in mice. Mol Cell Biol. 22(22):8005-14. A microarray study using two technical replicates of total RNA recovered from wild-type fully-grown oocytes, Hsf1 mutant fully-grown oocytes and Hsf2 mutant fully-grown oocytes. Each microarray measures the expression level of 42,586 probe sets from Mus musculus with nine 60-mer probe pairs per gene.

2011-06-30 | E-GEOD-26240 | biostudies-arrayexpress

HSF1 regulates transcription of sex-chromosomal multicopy genes during post-meiotic repression

Project description:Mapping of in vivo targets for HSF1 by using mammalian tissue material in a global ChIP-chip promoter screen. Chromatin was isolated from three wild-type (WT) mouse testes, crosslinked and sonicated into fragments of 100-500 bp, and the quality of the DNA was controlled before the immunoprecipitation, showing no signs of degradation. The DNA amplified from the HSF1 immunoprecipitation samples was labeled and hybridized against the total input DNA samples, on a 1.5 kb promoter tiling array (NimbleGen Systems Inc.), covering ~26000 promoters of the mouse genome. After hybridization and scanning, HSF1 hybridization signals were Lowess normalized to produce log2 ratios (HSF1 ChIP/Input DNA) for all replicate arrays. The promoter values were calculated as average log2 ratios over all probes for each promoter. To identify the HSF1 target population, we used a non-arbitrary analysis method called RankProd described in Breitling et al. 2004. RankProd has been published as an R/Bioconductor package. HSF1 ChIP sample vs. Input sample (reference), biological replicates: 3, one replicate per array.

2010-08-31 | E-GEOD-22492 | biostudies-arrayexpress

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