Leptolyngbya ohadii IS1
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA414369 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR6178280.fastq.gz | Fastqsanger.gz | |||
| SRR6178281.fastq.gz | Fastqsanger.gz | |||
| SRR6178272.fastq.gz | Fastqsanger.gz | |||
| SRR6178282.fastq.gz | Fastqsanger.gz | |||
| SRR6178273.fastq.gz | Fastqsanger.gz |
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Project description:Acclimation of cyanobacterium Synechocystis sp. PCC6803 to suboptimal conditions is largely dependent on adjustments of gene expression, which is highly controlled by the σ factor subunits of RNA polymerase (RNAP). The SigB and SigD σ factors are close homologues. Here we show that sigB and sigD genes are both induced in bright light and high temperature stresses. Comparison of transcriptomes of the control strain (CS), ΔsigB, ΔsigD, ΔsigBCE (SigD is an only functional group 2 σ factor), and ΔsigCDE (SigD is an only functional group 2 σ factor) strains in standard, bright light and high temperature conditions revealed that the SigB and SigD factors regulate different set of genes, and that SigB and SigD regulons are highly dependent on stress conditions. The SigB regulon is bigger than the SigD regulon at high temperature, whereas in bright light the SigD regulon is bigger the SigB regulon. Furthermore, our results show that favoring the SigB or SigD factor by deleting other group 2 σ factors do not lead to superior acclimation to bright light or high temperature conditions, indicating that all group 2 σ factors play roles in acclimation processes.
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Project description:Climate change is one of the main factors shaping the distribution and biodiversity of organisms, among others by greatly altering water availability, thus exposing species and ecosystems to harsh desiccation conditions. Insects are especially threatened by these challenging dry environments, because of their small size and thus large surface area to volume ratio. Drosophila melanogaster is a great model to study the response of populations to rapidly changing conditions, because of its southern-central African origin and recent worldwide colonization. Desiccation stress response is a complex and extensively studied trait, however the natural variation in tolerance, and the underlying transcriptomic and physiological mechanisms are still not clear. Here we subjected to desiccation stress 74 natural D. melanogaster European strains, belonging to five different climate zones. We found that the strains from cold semi-arid climates are more tolerant compared with the ones from hot summer mediterranean climate zones. Moreover, the variance in the tolerance of the strains correlates with the interaction of altitude and evaporation. We found that the tolerant strains had a lower level of initial water content and lose less water during desiccation stress. The reduction in the water loss is probably due to the decrease in the respiration rate in desiccation stress conditions, and to the cuticular hydrocarbon composition found in tolerant strains. Moreover, we found that the genes related to response to stimulus and environmental sensing are up-regulated only in the tolerant strains. Furthermore, we identified several desiccation candidate genes unique for the tolerant strains that can be targeted by tRNA derived fragments, known to be important in post-transcriptional gene regulation in several stress responses. We also looked for transposable element insertions possibly affecting the expression of genes relevant in desiccation tolerance, however, except for four insertions, there is no clear association between the presence of the TE insertions and the tolerance level of the strains. Overall, our study for the first time described the physiological and transcriptomic changes underlying the desiccation tolerance of natural European D. melanogaster strains and puts tRFs in the scope of desiccation related studies as possible regulators of desiccation tolerance.
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