2 items tagged with 'sampling time point'.
Cultivation of A. fumigatus in an O2-controlled fermenter and analysed its minute-scale responses to O2 limitation. Transcriptome sequencing revealed a group of genes underlying a rapid and highly dynamic regulation.
Creators: Jörg Linde, Falk Hillmann, Olaf Kniemeyer
Contributor: Maja Rey
Investigations: 1 hidden item
Studies: 1 hidden item
Assays: 1 hidden item
Created: 5th Sep 2017 at 09:21, Last updated: 4th Jun 2018 at 12:41
Candida albicans is the most important fungal pathogen of humans, causing severe infections, especially in nosocomial and immunocompromised settings. However, it is also the most prevalent fungus of … the normal human microbiome, where it shares its habitat with hundreds of trillions of other microbial cells. Despite weak organic acids (WOAs) being among the most abundant metabolites produced by bacterial microbiota, little is known about their effect on C. albicans. Here we used a sequencing-based profiling strategy to systematically investigate the transcriptional stress response of C. albicans to lactic, acetic, propionic, and butyric acid at several time points after treatment. Our data reveal a complex transcriptional response, with individual WOAs triggering unique gene expression profiles and with important differences between acute and chronic exposure. Despite these dissimilarities, we found significant overlaps between the gene expression changes induced by each WOA, which led us to uncover a core transcriptional response that was largely unrelated to other previously published C. albicans transcriptional stress responses. Genes commonly up-regulated by WOAs were enriched in several iron transporters, which was associated with an overall decrease in intracellular iron concentrations. Moreover, chronic exposure to any WOA lead to down-regulation of RNA synthesis and ribosome biogenesis genes, which resulted in significant reduction of total RNA levels and of ribosomal RNA in particular. In conclusion, this study suggests that gastrointestinal microbiota might directly influence C. albicans physiology via production of WOAs, with possible implications of how this fungus interacts with its host in both health and disease.
Authors: F. Cottier, A. S. Tan, J. Chen, J. Lum, F. Zolezzi, M. Poidinger, N. Pavelka
Date Published: 1st Feb 2015
Journal: G3 (Bethesda)
PubMed ID: 25636313
Citation: G3 (Bethesda). 2015 Jan 29;5(4):497-505. doi: 10.1534/g3.114.015941.
Created: 18th Sep 2017 at 10:02