Ontology highlight
ABSTRACT:
PROVIDER: PRJNA505542 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR8189310_1.fastq.gz | Fastqsanger.gz | |||
| SRR8189310_2.fastq.gz | Fastqsanger.gz | |||
| SRR8189311_1.fastq.gz | Fastqsanger.gz | |||
| SRR8189311_2.fastq.gz | Fastqsanger.gz | |||
| SRR8189312_1.fastq.gz | Fastqsanger.gz |
Items per page: 5 1 - 5 of 16 |
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Project description:Based on inheritance of acquired characteristics, Lamarckian theory of evolution explains the evolution of biological systems through epigenetics. In a previous study, we have shown how microbial evolution has resulted in a persistent reduction in expression after repeatedly selecting for the lowest PGAL1-YFP-expressing cells. Applying the ATAC-seq assay on samples collected from this 28-days evolution experiment, here we show how genome-wide chromatin compaction change during evolution under selection pressure. We found that the chromatin compaction was altered not only on GAL network genes directly impacted by the selection pressure, showing an example of non-genetic memory, but also at the whole genome level. The GAL network genes experienced chromatin compaction accompanying the reduction in PGAL1-YFP reporter expression; strikingly, the fraction of global genes with differentially compacted chromatin states accounted for about a quarter of the total genome. Moreover, some of the ATAC-seq peaks followed well-defined temporal dynamics. Comparing the peak’s intensity in consecutive days, we found most of the differential compaction to occur between days 0 and 3 when the selection pressure was first applied, and between days 7 and 10 when the pressure was lifted. Among the gene sets enriched for the differential compaction events, some had increased chromatin availability once selection pressure was applied and decreased availability after the pressure was lifted (or vice versa). These results intriguingly show that, despite the lack of targeted selection, transcriptional availability of a large fraction of the genome change in a very diverse manner during evolution and these changes can occur in a relatively short number of generations.
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Project description:Following antifungal treatment, Candida albicans, and other human pathogenic fungi can undergo microevolution, which leads to the emergence of drug resistance. However, the capacity for microevolutionary adaptation of fungi goes beyond the development of drug resistance. Here we used an experimental microevolution approach to show that one of the central pathogenicity mechanisms of C. albicans, the yeast-to-hyphae transition, can be subject to experimental evolution. The C. albicans cph1Δ/efg1Δ mutant is non-filamentous, as central signalling pathways linking environmental cues to hypha formation are disrupted. We subjected this mutant to constant selection pressure in the hostile environment of the macrophage phagosome. In a comparatively short time-frame, the mutant evolved the ability to escape macrophages by filamentation. To investigate the transcriptional response underlying the yeast-to-filament transition in the evolved strain, we applied RNA-Seq technology. Furthermore, RNA-Seq data were used to identify SNPs, which are specific for the evolved strain.
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