Ontology highlight
ABSTRACT:
PROVIDER: PRJNA662400 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR12613300.fastq.gz | Fastqsanger.gz | |||
| SRR12613301.fastq.gz | Fastqsanger.gz | |||
| SRR12613302.fastq.gz | Fastqsanger.gz | |||
| SRR12613303.fastq.gz | Fastqsanger.gz | |||
| SRR12613304.fastq.gz | Fastqsanger.gz |
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Project description:Coral reef ecosystems are metabolically founded on the mutualism between corals and photosynthetic dinoflagellates of the genus Symbiodinium. The glass anemone Aiptasia sp. has become a tractable model for this symbiosis. We utilized label-free liquid chromatography electrospray-ionization tandem mass spectrometry to analyze the effects of symbiosis on the proteomes of symbiotic and aposymbiotic Aiptasia. We quantified more than 3,300 proteins in 1,578 protein clusters, with 81 protein clusters showing significantly different expression. Symbiotic anemones showed higher expression of proteins involved in lipid storage and transport, nitrogen transport and cycling, intracellular trafficking, endocytosis and inorganic carbon transport. These changes reflect shifts in host metabolism and energy reserves due to increased organic and inorganic nutritional exchange with the symbionts. Aposymbiotic anemones exhibited increased expression of multiple systems responsible for mediating reactive oxygen stress, suggesting that the host derives direct or indirect protection from oxidative stress while in symbiosis. Aposymbiotic anemones also increased their expression of an array of proteases and chitinases, indicating a metabolic shift from autotrophy to heterotrophy. These results provide a comprehensive Aiptasia proteome with more direct relative quantification of protein abundance than transcriptomic methods, allowing more powerful studies of coral physiology and ecosystem function.
2017-02-22 | PXD003202 | Pride
Project description:Gene expression of symbiotic and aposymbiotic Aiptasia
| PRJNA317913 | ENA
Project description:Coral bleaching has devastating effects on coral survival and reef ecosystem function, but many of the fundamental cellular effects of thermal stress on cnidarian physiology are unclear. We used label-free liquid chromatography-tandem mass spectrometry to assess the effects of high temperatures on the proteome of the model symbiotic anemone Aiptasia sp. Anemones were acclimated to elevated temperatures (30 °C and 33.5 °C) for two weeks or exposed to short-term thermal shock (33.5 °C, 24 hours) without acclimation. We identified 2,137 protein clusters in Aiptasia, 136 of which were differentially abundant between treatments. There were minimal differences (nine proteins) in protein abundances between the control (25 °C) and acclimated high-temperature (30 °C and 33.5 °C) treatments, indicating that thermal acclimation in symbiotic cnidarians is not primarily regulated at the level of protein expression. Heat shock resulted in significant changes in the abundance of 104 proteins, including those involved in protein folding and synthesis, redox homeostasis, and central metabolism. Nineteen highly abundant cytoskeletal and structural proteins showed particularly reduced abundance (approximately 50%), demonstrating proteostasis disruption and inhibition of protein synthesis. Heat shock induced proteins involved in multiple mechanisms for stabilizing nascent proteins, preventing protein aggregation and degrading damaged proteins, indicative of endoplasmic reticulum stress. Antioxidant mechanisms and metabolic enzymes necessary for redox homeostasis were also upregulated. Disruption of host proteostasis occurred before either bleaching or symbiont photoinhibition was detected, strongly suggesting endogenous reactive oxygen species production as the proximate cause of thermal damage. The effects of thermal shock were most pronounced at the endoplasmic reticulum, and proteostasis maintenance and protein turnover mechanisms may be essential in the response to severe thermal stress in symbiotic cnidarians.
2018-03-14 | PXD004257 | Pride
Project description:Green hydra (Hydra viridissima) harbors endosymbiotic Chlorella and have established a mutual relation. To identify the host hydra genes involved in the specific symbiotic relationship, transcriptomes of intact H. viridissima colonized with symbiotic Chlorella strain A99, aposymbiotic H.viridissima and H. viridissima artificially infected with other symbiotic Chlorella were compared by microarray analysis. The results indicated that genes involved in nutrition supply to Chlorella were upregulated in the symbiotic hydra. In addition, it was induced by supply of photosynthates from the symbiont to the host, suggesting cooperative metabolic interaction between the host and the symbiotic algae.
2018-04-01 | GSE97633 | GEO
Project description:Background Regulation of transcription is essential for any organism and Rhizobium etli (a multi-replicon, nitrogen-fixing symbiotic bacterium) is no exception. This bacterium is commonly found in the rhizosphere (free-living) or inside of root-nodules of the common bean (Phaseolus vulgaris) in a symbiotic relationship. Abiotic stresses, such as high soil temperatures and salinity, compromise the genetic stability of R. etli and therefore its symbiotic interaction with P. vulgaris. However, it is still unclear which genes are up- or down-regulated to cope with these stress conditions. The aim of this study was to identify the genes and non-coding RNAs (ncRNAs) that are differentially expressed under heat and saline shock, as well as the promoter regions of the up-regulated loci. Results Analysing the heat and saline shock responses of R. etli CE3 through RNA-Seq, we identified 756 and 392 differentially expressed genes, respectively, and 106 were up-regulated under both conditions. Notably, the set of genes over-expressed under either condition was preferentially encoded on plasmids, although this observation was more significant for the heat shock response. In contrast, during either saline shock or heat shock, the down-regulated genes were principally chromosomally encoded. Our functional analysis shows that genes encoding chaperone proteins were up-regulated during the heat shock response, whereas genes involved in the metabolism of compatible solutes were up-regulated following saline shock. Furthermore, we identified thirteen and nine ncRNAs that were differentially expressed under heat and saline shock, respectively, as well as eleven ncRNAs that had not been previously identified. Finally, using an in silico analysis, we studied the promoter motifs in all of the non-coding regions associated with the genes and ncRNAs up-regulated under both conditions. Conclusions Our data suggest that the replicon contribution is different for different stress responses and that the heat shock response is more complex than the saline shock response. In general, this work exemplifies how strategies that not only consider differentially regulated genes but also regulatory elements of the stress response provide a more comprehensive view of bacterial gene regulation.
2014-08-20 | GSE50018 | GEO
Project description:Background Regulation of transcription is essential for any organism and Rhizobium etli (a multi-replicon, nitrogen-fixing symbiotic bacterium) is no exception. This bacterium is commonly found in the rhizosphere (free-living) or inside of root-nodules of the common bean (Phaseolus vulgaris) in a symbiotic relationship. Abiotic stresses, such as high soil temperatures and salinity, compromise the genetic stability of R. etli and therefore its symbiotic interaction with P. vulgaris. However, it is still unclear which genes are up- or down-regulated to cope with these stress conditions. The aim of this study was to identify the genes and non-coding RNAs (ncRNAs) that are differentially expressed under heat and saline shock, as well as the promoter regions of the up-regulated loci. Results Analysing the heat and saline shock responses of R. etli CE3 through RNA-Seq, we identified 756 and 392 differentially expressed genes, respectively, and 106 were up-regulated under both conditions. Notably, the set of genes over-expressed under either condition was preferentially encoded on plasmids, although this observation was more significant for the heat shock response. In contrast, during either saline shock or heat shock, the down-regulated genes were principally chromosomally encoded. Our functional analysis shows that genes encoding chaperone proteins were up-regulated during the heat shock response, whereas genes involved in the metabolism of compatible solutes were up-regulated following saline shock. Furthermore, we identified thirteen and nine ncRNAs that were differentially expressed under heat and saline shock, respectively, as well as eleven ncRNAs that had not been previously identified. Finally, using an in silico analysis, we studied the promoter motifs in all of the non-coding regions associated with the genes and ncRNAs up-regulated under both conditions. Conclusions Our data suggest that the replicon contribution is different for different stress responses and that the heat shock response is more complex than the saline shock response. In general, this work exemplifies how strategies that not only consider differentially regulated genes but also regulatory elements of the stress response provide a more comprehensive view of bacterial gene regulation. mRNA of nine independent cultures of wild type strain Rhizobium etli CE3 were sequenced using Illumina GAIIx. Our parameters were: all cultures were taken from exponential phase, at 30M-BM-0C for 30min in control condition; 42M-BM-0C for 30min for the culture subject to heat -shock, and 30min at 30M-BM-0C in supplementary PY medium with 80mM NaCl for the saline shock condition.
2014-08-20 | E-GEOD-50018 | biostudies-arrayexpress
Project description:The endosymbiotic interaction established by cnidarians and photosynthetic dinoflagellate algae is the foundation of coral reef ecosystems. This essential interaction is globally threatened to breakdown by anthropogenic disturbance. As such, it is compelling to understand the molecular mechanisms underpinning the cnidarian-algal association. We investigated phosphorylation-mediated protein signaling as a mechanism of regulation of the cnidarian-algal interaction, and we report on the generation of the first phosphoproteome for the coral model system Aiptasia. Using mass spectrometry-based phosphoproteomics in data-independent acquisition (DIA) allowed consistent quantification of over 3,000 phosphopeptides totaling more than 1,600 phosphoproteins across aposymbiotic (symbiont-free) and symbiotic anemones. Additionally, to allow for discrimination between translational regulation and post-translational phosphorylation, we generated a total proteome dataset from the same anemones and used it for phosphopeptide normalization against protein amount. While quantification of protein phosphorylation relied upon the generation of a spectrum library generated by data-dependent acquisition (DDA), total protein quantification in DIA was conducted "library-free" (directDIA) in SpectronautX. DirectDIA allowed consistent quantification of 20,215 peptides, totaling 4,121 proteins (3,518 protein groups) across biological samples.
2019-11-06 | PXD014076 | Pride
Project description:We used illumina-based next generation sequencing technology to to identify the regions bound by HSFA1b in the Arabidopsis genome. We sequenced HSFA1b chromatin immunoprecipitated genomic sequences under non-stress and heat stress conditions to understand the changes in the HSFA1b binding map when the growth conditions are switched from favorable to heat stress. We show that the binding map of HSFA1b in the Arabidopsis genome is subject to reconfiguration when the growth conditions are switched from non-stress to heat stress response. We also show that HSFA1b is targeting genes involved in developmental processes beside genes involved in stress response under both conditions indicating that HSFA1b possibly regulates the expression of both developmental and stress genes under non-stress and under heat stress, possibly for a limited duration prior heat acclimation.
2018-05-30 | GSE85651 | GEO
Project description:The acquisition of thermally tolerant algal symbionts by corals has been proposed as a natural or assisted mechanism of increasing coral reef resilience to anthropogenic climate change, but the cell-level processes determining the performance of new symbiotic associations are poorly understood. We used liquid chromatography-mass spectrometry to investigate the effects of an experimentally-induced symbiosis on the host proteome of the model sea anemone Exaiptasia pallida. Aposymbiotic specimens were colonised by either the homologous dinoflagellate symbiont (Breviolum minutum) or a thermally tolerant, ecologically invasive heterologous symbiont (Durusdinium trenchii). Anemones containing D. trenchii exhibited minimal expression of Niemann-Pick C2 proteins, which have predicted biochemical roles in sterol transport and cell recognition, and glutamine synthetases, which are thought to be involved in nitrogen assimilation and recycling between partners. D. trenchii-colonised anemones had higher expression of methionine-synthesizing betaine–homocysteine S-methyltransferases and proteins with predicted oxidative stress response functions. Multiple lysosome-associated proteins were less abundant in both symbiotic treatments compared with the aposymbiotic treatment. The differentially abundant proteins are predicted to represent pathways that may be involved in nutrient transport or resource allocation between partners. These results provide targets for specific experiments to elucidate the mechanisms underpinning compensatory physiology in the coral–dinoflagellate symbiosis.
2019-05-27 | PXD009253 | Pride