C. albicans biofilm development
Ontology highlight
ABSTRACT:
ORGANISM(S): Candida albicans
PROVIDER: GSE61143 | GEO | 2014/10/01
SECONDARY ACCESSION(S): PRJNA260347
REPOSITORIES: GEO
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Project description:Transcriptional profiling of C. albicans in biofilms after 90 min of adherence or 8 h, 24 h, or 48 h of development; compared to C. albicans in suspension cultures grown to log at 30 deg or 37 deg or grown to stationary phase at 30 deg or collected from the unadhered cells in the biofilm assay. At least 2 biological replicates for each condition. All experiments are multiple condition: C. albicans in particular growth condition vs. mixed reference of all conditions in that experiment.
2014-10-01 | E-GEOD-61143 | biostudies-arrayexpress
Project description:Biofilm formation on medically implanted devices by Candida albicans poses a significant clinical challenge. Here we compared biofilm-associated gene expression in two clinical C. albicans isolates, SC5314 and WO-1, to identify shared gene regulatory responses that may be functionally relevant. Among the 50 genes most highly expressed in biofilms relative to planktonic (suspension-grown) cells, we were able to recover insertion mutations in 25 genes. We observed that 20 of the 25 mutants have altered biofilm-related properties, including cell-substrate adherence, cell-cell signaling, and azole susceptibility. We focused on the most highly up-regulated gene in biofilms, RHR2, which specifies the glycerol biosynthetic enzyme glycerol-3-phosphate phosphatase. Glycerol is 5-fold more abundant in biofilm cells than planktonic cells, and an rhr2D/D strain accumulates 2-fold less biofilm glycerol than the wild type. Under in vitro growth conditions, the rhr2D/D mutant has reduced biofilm biomass and reduced adherence to silicone. The rhr2D/D mutant is severely defective in biofilm formation in vivo, in a rat catheter infection model. Expression profiling of the rhr2D/D mutant indicates that it has reduced expression of cell surface adhesin genes ALS1, ALS3, and HWP1, as well as a large fraction of all other biofilm up-regulated genes. Reduced adhesin expression is the cause of the rhr2D/D mutant biofilm defect, because overexpression of ALS1, ALS3, or HWP1 restores biofilm formation ability to the mutant in vitro and in vivo. Our findings indicate that internal glycerol has a regulatory role in biofilm gene expression, and that adhesin genes are among the main functional Rhr2-regulated genes.
2013-04-12 | GSE45141 | GEO
Project description:Biofilm formation on medically implanted devices by Candida albicans poses a significant clinical challenge. Here we compared biofilm-associated gene expression in two clinical C. albicans isolates, SC5314 and WO-1, to identify shared gene regulatory responses that may be functionally relevant. Among the 50 genes most highly expressed in biofilms relative to planktonic (suspension-grown) cells, we were able to recover insertion mutations in 25 genes. We observed that 20 of the 25 mutants have altered biofilm-related properties, including cell-substrate adherence, cell-cell signaling, and azole susceptibility. We focused on the most highly up-regulated gene in biofilms, RHR2, which specifies the glycerol biosynthetic enzyme glycerol-3-phosphate phosphatase. Glycerol is 5-fold more abundant in biofilm cells than planktonic cells, and an rhr2D/D strain accumulates 2-fold less biofilm glycerol than the wild type. Under in vitro growth conditions, the rhr2D/D mutant has reduced biofilm biomass and reduced adherence to silicone. The rhr2D/D mutant is severely defective in biofilm formation in vivo, in a rat catheter infection model. Expression profiling of the rhr2D/D mutant indicates that it has reduced expression of cell surface adhesin genes ALS1, ALS3, and HWP1, as well as a large fraction of all other biofilm up-regulated genes. Reduced adhesin expression is the cause of the rhr2D/D mutant biofilm defect, because overexpression of ALS1, ALS3, or HWP1 restores biofilm formation ability to the mutant in vitro and in vivo. Our findings indicate that internal glycerol has a regulatory role in biofilm gene expression, and that adhesin genes are among the main functional Rhr2-regulated genes. Gene expression profiles, in duplicate; (1) for biofilm vs. planktonic growth conditions for the two wild-type clinical isolates of Candida albicans (SC5314 and WO1-white/WO1-opaque), and (2) for rhr2M-NM-^T/M-NM-^T mutant and complemented strain, via RNA-deep sequencing using Illumina GA2 and HiSeq2000 platforms, respectively
2013-04-12 | E-GEOD-45141 | biostudies-arrayexpress
Project description:Transcriptional profiling of C. albicans when monocultured in suspension culture or in biofilms compared to when co-cultured with C. perfringens in suspension culture, or with E. coli, K. pneumoniae, E. faecalis, C. perfringens, or B. fragilis in biofilms, or in the presence of N-acetylglucosamine in biofilms.
2014-03-03 | GSE55026 | GEO
Project description:Transcriptional profiling of C. albicans when monocultured in suspension culture or in biofilms compared to when co-cultured with C. perfringens in suspension culture, or with E. coli, K. pneumoniae, E. faecalis, C. perfringens, or B. fragilis in biofilms, or in the presence of N-acetylglucosamine in biofilms. At least 2 replicates for each condition except for biofilms +N-acetylglucosamine, some experiments are two-condition experiments: C. albicans +/- bacteria vs. C. albicans. Some experiments multiple condition: C. albicans +/- bacteria vs. mixed reference of all conditions in that experiment.
2014-03-03 | E-GEOD-55026 | biostudies-arrayexpress
Project description:We sought to identify transcriptomic changes that arise when E. faecalis biofilms are cultivated in the presence of C. albicans. We used RNASeq analaysis to compare the transcriptome of 48 hr biofilm-grown cells of E. faecalis. We compared the transcriptome of E. faecalis cells grown as a mono-species biofilm to that of E. faecalis cells that were grown in a biofilm that was co-inoculated with the yeast C. albicans.
2025-03-03 | GSE290415 | GEO
Project description:The global extracellular protease substrate specificity of C. albicans under biofilm and planktonic (suspension) conditions was determined with a synthetic library of 14-mer peptide substrates using an approach termed Multiplex Substrate Profiling by Mass Spectrometry (MSP-MS). Shotgun proteomics analysis on conditioned media from C. albicans grown under biofilm and planktonic conditions was performed to identify the corresponding proteases.
2016-03-09 | MSV000079564 | MassIVE
Project description:C. albicans is a dimorphic yeast which can switch from budding yeast and to hyphal forms and this property is essential for biofilm establishment and maturation. C. albicans undergoes this yeast-to-hyphal switch in response to high CO2. The purpose of this study is to use RNA-seq to investigate pathways whose genes are differentially expressed when C. albicans biofilms are grown in a physiologically relevant elevated (5%) CO2 environment compared to a low/atmospheric (0.03%) CO2 environment. We report that in C.albicans biofilms grown under 5% CO2 conditions, genes controlled by core biofilm regulatory transcription factors such as Brg1, Efg1, Ndt80, and Bcr1 are overall expressed at significantly higher levels compared to those grown in 0.03% CO2 conditions. We find that genes encoding glucose and amino acid transporters, as well as genes previously found to be involved in the response to Ketoconazole treatment, are significantly upregulated in 5% CO2 C. albicans biofilms. Overall, these data suggest a high CO2 environment enhances biofilm formation of C. albicans and may also increase antifungal tolerance of such biofilms.
2021-04-14 | GSE172004 | GEO
Project description:Candida albicans is a commensal yeast within the human microbiota with significant medical importance because of its pathogenic potential. The yeast produces biofilms, which are highly resistant to available antifungals. High level of antifungal resistance by C. albicans biofilms has resulted in the need for alternative treatment. Polyunsaturated fatty acids such as arachidonic acid has been reported to increase the susceptibility of C. albicans biofilms to azole. However, the underlining mechanism is unknown. To unravel the mechanism behind this phenomenon, identification of differentially regulated genes in C. albicans biofilms grown in the presence of arachidonic acid, fluconazole, and the combination of both compounds was conducted using RNAseq.
2020-08-25 | GSE137423 | GEO
Project description:Biofilms are sessile microbial communities that are often resistant to conventional antimicrobial therapeutics and the host immune system. Candida albicans is an opportunistic pathogenic yeast and responsible for candidiasis. It readily colonizes host tissues and implant devices, and forms biofilms, which play an important role in pathogenesis and drug resistance. Its morphological transition from budding yeast to hyphal form and subsequent biofilm formation is regarded as the crucial factor for drug tolerance and virulence of Candida infections. In this study, nepodin (also called musizin) from Rumex japonicus root was investigated for antibiofilm, antihyphae, and antivirulence activities against fluconazole-resistant C. albicans strain. Nepodin at 2 µg/ml from Rumex plant effectively inhibited C. albicans biofilm formation by more than 90% but had no effect on planktonic cell growth. Also, Rumex root extract and nepodin inhibited hyphal growth and cell aggregation of C. albicans. Interestingly, nepodin also showed antibiofilm activity against Staphylococcus aureus or A. baumannii strains and two systems of dual biofilms of C. albicans and S. aureus or A. baumannii, respectively. Transcriptomic analysis using RNA-seq and qRT-PCR showed nepodin repressed the expressions of several hypha/biofilm related genes (ECE1, HWP1, and UME6) and overexpressed several transport genes (CDR4, CDR11, IFD6, and TPO2), which supported observed phenotypic changes.
2021-09-01 | GSE119822 | GEO