DcPerAmph
Ontology highlight
ABSTRACT:
PROVIDER: PRJEB76750 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| ERR13317819_1.fastq.gz | Fastqsanger.gz | |||
| ERR13317819_2.fastq.gz | Fastqsanger.gz | |||
| ERR13304135.fastq.gz | Fastqsanger.gz | |||
| ERR13304136.fastq.gz | Fastqsanger.gz | |||
| ERR13304137.fastq.gz | Fastqsanger.gz |
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Project description:Complete submergence represses photosynthesis and aerobic respiration causing rapid mortality in most terrestrial plants, but some species have evolved traits allowing them to survive prolonged flooding. Here, we studied the response to submergence of two species and their F1 hybrid in the genus Rorippa, which is related to the model Arabidopsis. We showed that these species have high tolerance to complete, deep submergence, but R. sylvestris survived longer than R. amphibia and the F1 hybrid. While the former restricted growth upon submergence, the latter two genotypes showed induced stem and petiole elongation and had higher aerenchyma contents, indicative of a low oxygen escape strategy. Arabidopsis GeneChip microarrays were used for whole-genome transcript profiling of roots of young plants exposed to air or a 24-h submergence treatment, using a probe mask based on hybridisation of genomic DNA of both species to the arrays. The induction by the submergence treatment of genes involved in glycolysis and fermentation and repression of many energy consuming pathways was similar to the response to low oxygen of Arabidopsis and rice. Notably, sucrose synthases, glycolysis and fermentation genes were more strongly induced in the less tolerant R. amphibia than in R. sylvestris, which might indicate faster carbohydrate consumption of the former, while some genes involved in hydrogen peroxide scavenging were strongly and specifically induced in the latter. F1 hybrids showed a generally weaker response to submergence and an additive mode of gene action, which did not change by the submergence treatment. Experiment Overall Design: We used replicated clones of Rorippa amphibia, Rorippa sylvestris and their F1 hybrid. Plants were grown on sand in pots for three weeks, completely submerged in rain water for 24 h, or kept in air as a control. Three biological controls were collected per genotype, each consisting of a pool of three individuals. Roots were separated from the shoots, quickly rinsed and immediately frozen and used for RNA extraction and hybridization to Arabidopsis Ath1 GeneChips. Genomic DNA of Rorippa amphibia and Rorippa sylvestris was also hybridized to the GeneChips in order to filter out badly performing probes due to sequence divergences from Arabidopsis.
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Project description:Analyses of new genomic, transcriptomic or proteomic data commonly result in trashing many unidentified data escaping the ‘canonical’ DNA-RNA-protein scheme. Testing systematic exchanges of nucleotides over long stretches produces inversed RNA pieces (here named “swinger” RNA) differing from their template DNA. These may explain some trashed data. Here analyses of genomic, transcriptomic and proteomic data of the pathogenic Tropheryma whipplei according to canonical genomic, transcriptomic and translational 'rules' resulted in trashing 58.9% of DNA, 37.7% RNA and about 85% of mass spectra (corresponding to peptides). In the trash, we found numerous DNA/RNA fragments compatible with “swinger” polymerization. Genomic sequences covered by «swinger» DNA and RNA are 3X more frequent than expected by chance and explained 12.4 and 20.8% of the rejected DNA and RNA sequences, respectively. As for peptides, several match with “swinger” RNAs, including some chimera, translated from both regular, and «swinger» transcripts, notably for ribosomal RNAs. Congruence of DNA, RNA and peptides resulting from the same swinging process suggest that systematic nucleotide exchanges increase coding potential, and may add to evolutionary diversification of bacterial populations.
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