Ontology highlight
ABSTRACT:
PROVIDER: PRJNA886636 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR21786405_1.fastq.gz | Fastqsanger.gz | |||
| SRR21786405_2.fastq.gz | Fastqsanger.gz | |||
| SRR21786406_1.fastq.gz | Fastqsanger.gz | |||
| SRR21786406_2.fastq.gz | Fastqsanger.gz | |||
| SRR21786407_1.fastq.gz | Fastqsanger.gz |
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Project description:Several microorganisms have wide temperature growth range and versatility to tolerate large thermal fluctuations in diverse environments. To better understand thermal adaptation of psychrotrophs, Exiguobacterium sibiricum strain 255-15 was used, a psychrotrophic bacterium that grows from -5°C to 39°C. Its genome is approximately 3 Mb in size, has a GC content of 47.7% and includes 2,978 putative protein-encoding genes (CDS). The genome and transcriptome analysis along with the organism's known physiology was used to better understand its thermal adaptation. A total of about 27%, 3.2% and 5.2% of E. sibiricum strain 255-15 CDS spotted on the DNA microarray yielded differentially expressed genes in cells grown at -2.5°C, 10°C and 39°C, respectively, when compared to cells grown at 28°C. The hypothetical and unknown genes represented 10.6%, 0.89% and 2.3% of the CDS differentially expressed when grown at -2.5°C, 10°C and 39°C versus 28°C. The transcriptome analyses showed that E. sibiricum is constitutively adapted to cold temperatures since little differential gene expression was observed at growth temperatures of 10°C and 28°C, but at the extremities of its Arrhenius growth profile, namely -2.5°C and 39°C, much more differential gene expression occurred. The genes that responded were more typically associated with stress response. Keywords: stress response to cold and hot temperatures
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Project description:A screening process was used to determine hyperosmotic as well as cold stress tolerance of a diverse set of Listeria monocytogenes strains and was based on the capacity to grow at sub lethal levels of NaCl and 4°C. Analysis of gene expression in cells adapted to cold and hyperosmotic stress revealed significant strain specificity in terms of individual gene expression profiles though general patterns of expression within functional gene subsets were largely similar. . Strain ATCC19115 revealed 150 significantly up- and 146 down-regulated genes in cells adapted to both hyperosmotic and cold stress, 82 up- and 56 down-regulated genes were matching in response to both stresses in strain 70-1700, whereas ScottA, a relatively stress-tolerant strain, showed up-regulation of 77 genes whilst 106 genes were significantly down-regulated. Among these homologously expressed genes only 22 were found to be significantly up-regulated and only 7 were down-regulated in all three strains adapted to hyperosmotic stress and cold temperature, suggesting a dominating strain specific response. Overall adaptation to hyperosmotic and low temperature growth conditions in three L. monocytogenes strains were found to have many parallels, especially when examined using a statistically-based ontological approach. Evidence was presented for strong activation of genes associated with protein synthesis, in particular those coding proteins of the ribosome and involved directly in transcription. Genes associated with DNA maintenance; modification to cell envelope, and cell division were also up-regulated. On the other hand strong suppression of genes associated with carbohydrate metabolism and transport as well as flagella assembly was evident in stress adapted cells most likely due to energy preservation via CodY regulon. This suggests that adaptation to these adverse conditions engages similar mechanisms to cope with the induced stressful environments. The microarray component of the experiments had the aim of determining: i) To examine the gene expression responses of three L. monocytogenes strains that had different intrinsic salt resistances following adaptation to hyperosmotic stress. ii) To examine the gene expression responses of three L. monocytogenes strains that had different intrinsic cold tolerances following adaptation to cold stress. iii) To evaluate common pathways of adaptation to hyperosmotic and cold stresses
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Project description:Several microorganisms have wide temperature growth range and versatility to tolerate large thermal fluctuations in diverse environments. To better understand thermal adaptation of psychrotrophs, Exiguobacterium sibiricum strain 255-15 was used, a psychrotrophic bacterium that grows from -5°C to 39°C. Its genome is approximately 3 Mb in size, has a GC content of 47.7% and includes 2,978 putative protein-encoding genes (CDS). The genome and transcriptome analysis along with the organism's known physiology was used to better understand its thermal adaptation. A total of about 27%, 3.2% and 5.2% of E. sibiricum strain 255-15 CDS spotted on the DNA microarray yielded differentially expressed genes in cells grown at -2.5°C, 10°C and 39°C, respectively, when compared to cells grown at 28°C. The hypothetical and unknown genes represented 10.6%, 0.89% and 2.3% of the CDS differentially expressed when grown at -2.5°C, 10°C and 39°C versus 28°C. The transcriptome analyses showed that E. sibiricum is constitutively adapted to cold temperatures since little differential gene expression was observed at growth temperatures of 10°C and 28°C, but at the extremities of its Arrhenius growth profile, namely -2.5°C and 39°C, much more differential gene expression occurred. The genes that responded were more typically associated with stress response. Keywords: stress response to cold and hot temperatures Six-condition experiment: -2.5°C vs10°C, -2.5°C vs 28°C, -2.5°C vs 39°C, 28°C vs10°C, 28°C vs 39°C, 10°C vs 39°C. Biological replicates: 6 replicates grown and harvested independently for each different temperature (-2.5°C, 10°C, 28°C and 39°C). One replicate per array.
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