Dynamic behavior of the epigenetic machinery upon thermal stress
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PROVIDER: PRJNA496026 | ENA |
REPOSITORIES: ENA
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Project description:Maintenance of the epigenome is of utmost importance to warrant appropriate cellular functioning Here we analyzed PRC1/2 function, in response to cellular stress. We observe that heat shock (HS) leads to nucleolar accumulation of CBX proteins, and are strongly immobilized in a 1,6-hexanediol insensitive manner, suggestive of a HS-induced liquid-to-solid phase transition of the nucleolus. CBX protein recovery from the nucleolus is dependent on heat shock protein (HSP) activity. LC-MS/MS analyses of nucleoli shows HS-induced nucleolar accumulation of PRC1/2 subunits, various chromatin regulators, HSPs, and the 26S proteasome. Finally, we find that HS leads to a strong reduction of PRC1/2 chromatin binding at target genes and loss of H2AK119ub and H3K27me3. Our findings demonstrate that thermal stress results in a rapid accumulation of epigenetic regulators in the nucleolus, and a concomitant loss of PRC1/2 complex chromatin binding and associated epimarks, underlining that environmental stress directly alters the epigenome.
2019-05-31 | GSE121182 | GEO
Project description:Thermal history plays a role in the response of corals to subsequent heat stress. Prior heat stress can have a profound impact on later thermal tolerance, but the mechanism for this plasticity is not clear. The understanding of gene expression changes behind physiological acclimatization is critical in forecasts of coral health in impending climate change scenarios. Acropora millepora fragments were preconditioned to sublethal bleaching threshold stress for a period of 10 days; this prestress conferred bleaching resistance in subsequent thermal challenge, in which non-preconditioned coral bleached. Using microarrays, we analyze the transcriptomes of the coral host, comparing the bleaching-resistant preconditioned treatment to non-preconditioned and control treatments.
2012-11-29 | GSE41435 | GEO
Project description:Here, we investigate the genetic mechanisms that underlie thermal specialization of closely-related vibrios isolated from coastal water at the Beaufort Inlet (Beaufort, NC, USA). This location experiences large seasonal temperature fluctuations (annual range of ~20°C), and a clear seasonal shift in vibrio diversity has been observed (Yung et al. 2015). This previous study suggested that the mechanisms of thermal adaptation apparently differ based on evolutionary timescale: shifts in the temperature of maximal growth occur between deeply branching clades but the shape of the thermal performance curve changes on shorter time scales (Yung et al. 2015). The observed thermal specialization in vibrio populations over relatively short evolutionary time scales indicates that few genes or cellular processes may contribute to the differences in thermal performance between populations. In order to understand the molecular mechanisms that underlie adaptation to local thermal regimes in environmental vibrio populations, we employ genomic and transcriptomic approaches to examine transcriptomic changes that occur within strains grown at their thermal optima and under heat and cold stress. Moreover, we compare two closely-related strains with different laboratory thermal preferences to identify in situ evolutionary responses to different thermal environments in genome content and alleles as well as gene expression.
2018-07-31 | GSE83396 | GEO
Project description:Thermal history plays a role in the response of corals to subsequent heat stress. Prior heat stress can have a profound impact on later thermal tolerance, but the mechanism for this plasticity is not clear. The understanding of gene expression changes behind physiological acclimatization is critical in forecasts of coral health in impending climate change scenarios. Acropora millepora fragments were preconditioned to sublethal bleaching threshold stress for a period of 10 days; this prestress conferred bleaching resistance in subsequent thermal challenge, in which non-preconditioned coral bleached. Using microarrays, we analyze the transcriptomes of the coral host, comparing the bleaching-resistant preconditioned treatment to non-preconditioned and control treatments. This experiment compared host gene expression of Acropora millepora across control, non-preconditioned, and preconditioned treatments. Fragments were sampled prior to preconditioning (Day 4), following 10 days of thermal preconditioning (Day 20), and after two (Day 23), four (Day 25), and eight days (Day 29) of 31M-BM-0C thermal challenge. The analysis implements 45 arrays, representing 5 sampling points of three treatments (n=3).
2012-11-29 | E-GEOD-41435 | biostudies-arrayexpress
Project description:These samples comprise the full analysis of liver function during response to thermal injury. Keywords: Time Course
2006-08-30 | GSE5647 | GEO
Project description:In a rapidly warming world, exposure to high temperatures may impact fitness, but the gene regulatory mechanisms that link sublethal heat to sexually selected traits are not well understood, particularly in endothermic animals. Our experiment used zebra finches (Taeniopygia guttata), songbirds that experience extreme temperature fluctuations in their native Australia. We exposed captive males to an acute thermal challenge (43°C) compared with thermoneutral (35°C) and lower (27°C) temperatures. We found significantly more heat dissipation behaviors at 43°C and heat retention behaviors at 27°C, temperatures previously shown to reduce song production and fertility. Next, we characterized gene expression in tissues important for mating effort – the posterior telencephalon, for its role in song production, and the testis, for its role in fertility and hormone production. Differential expression of hundreds of genes in the testes, but few in the brain, suggest the brain is more buffered from extreme temperatures. Nevertheless, dopaminergic signaling in the brain co-varied with heat dissipation behaviors, providing a mechanism by which temporary thermal challenges may alter motivational circuits for song production. In both brain and testis, we also observed quantitative continuous variation between thermally sensitive gene networks and individual differences in thermoregulatory behavior, indicating that mechanisms of thermal-behavioral tolerance have microevolutionary potential. Taken together, these results suggest that selection for thermal tolerance could impact performance of sexually selected traits, and in turn, sexual selection in a warming world could influence how thermal tolerance evolves.
2022-10-01 | GSE185196 | GEO
Project description:Cryptosporidium lacks tools that can identify the targets of emerging compounds that have been developed against this parasite. Thermal proteomic profiling is an unbiased approach that fulfils this unmet need by detecting changes in the thermal stability of target proteins upon the binding of their inhibitor. This technique has been successfully used in other protozoan parasites and here we report the validation and first use of thermal proteome profiling in Cryptosporidium.
2023-06-13 | PXD037942 | Pride
Project description:Investigation of gene expression in human skin keratinocytes (HaCaT) following non-thermal plasma treatment for 20 s, 60 s, and 180 s compared to untreated and H2O2-treated controls. Microarrays were used to analyze and investigate the biological effects of non-thermal plasma on human keratinocyte cells. Using an argon plasma jet kinpen, regulated transcripts were analyzed and further described in Schmidt et al. (2014): “Transcript profiling identifies an important role for Nrf2/Keap1-pathway after non-thermal plasma treatment in human keratinocytes”.
2014-06-12 | GSE58395 | GEO
Project description:Photosystem II (PSII) is the most thermally sensitive component of photosynthesis. Thermal acclimation of this complex activity is likely to be critically important to the ability of photosynthetic organisms to tolerate temperature changes in the environment. We have analysed gene expression using whole-genome microarrays and monitored alterations in physiology during acclimation of PSII to elevated growth temperature in Synechocystis sp. PCC 6803. PSII acclimation is complete within 480 minutes of exposure to elevated temperature and is associated with a highly dynamic transcriptional response. 176 genes were identified and classified into seven distinct response profile groups. Response profiles suggest the existence of an early transient phase and a sustained phase to the acclimation response. The early phase was characterised by induction of general stress response genes, including heat shock proteins, which are likely to influence PSII thermal stability. The sustained phase consisted of acclimation-specific alterations that are involved in other cellular processes. Sustained responses included genes involved in phycobillisome structure and modification, photosynthesis, respiration, lipid metabolism and motility. Approximately 60% of genes with sustained altered expression levels have no known function. The potential role of differentially expressed genes in thermotolerance and acclimation is discussed. We have characterised the acclimation physiology of selected gene ‘knockouts’ to elucidate possible gene function in the response. All mutants show lower PSII rates under normal growth conditions. Basal PSII thermotolerance was affected by mutations in clpB1, cpcC2, hspA, htpG and slr1674. Final PSII thermotolerance was affected by mutations in cpcC2, hik34, hspA and hypA1, suggesting that these gene products play roles in long-term thermal acclimation of PSII. Gene expression levels were compared during a time-course (up to 8 hours) of thermal acclimation (from 25C to 38C) of a wild-type strain grown under continuous illumination and bubbled with CO2 -enriched air. Up to four independent biological replicates were generated and analysed. Each array: replicate matched time-point vs. 0hr control.
2010-04-09 | E-GEOD-21133 | biostudies-arrayexpress