Unknown,Transcriptomics,Genomics,Proteomics

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Gene expression in wild type and Cagal102 knockout Candida albicans strains.

ABSTRACT: CaGAL102 is a sequence homolog of Rmlb. In Candida knock out of this gene causes abnormal hyphal morphogenesis and increased sensitivity to cell wall damaging agents. The knock out strain is also avirulent in mouse model of systemic infection. To get a larger insight into the function of the protein product of this gene we carried out global transcription analysis through micro array experiment. The gene is expressed under normal growth conditions and the knock out causes the cells to become hyphal under these conditions. Many of the cell wall proteins were upregulated recapitulating the cell morphology. Keywords: Candida albicans, Gene knockout, genome wide transcription profiling study Wild type Sc5314 cells and the mutant CAS12 were grown in YPD till (OD 600nm) 1 following which total RNA was extracted using hot phenol method. The RNA was checked using Bioanalyser (Agilent). Single dye experiment was carried out using Cy3 labelled pooled wild type samples and two independent mutant RNA samples.

ORGANISM(S): Candida albicans

SUBMITTER: Genotypic technology

PROVIDER: E-GEOD-20883 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Transcriptional profiling of CDC53 down-regulated Candida albicans cells compared to control cells Keywords: comparative genomic hybridization, genetic modification Candida albicans is an important opportunistic human fungal pathogen, which can cause mucosal as well as systemic infections in immunocompromised patients. Critical for the virulence of C. albicans is its ability to undergo a morphological transition from yeast to hyphal growth mode. Proper induction of filamentation is dependent on the ubiquitination pathway, which targets proteins for proteasome-mediated protein degradation or activates them for signaling events. In the present study, we evaluated the role of ubiquitination in C. albicans by impairing the function of the major ubiquitin-ligase complex SCF. This was done by depleting its backbone, the cullin Cdc53p (orf19.1674), using a tetracycline down-regulatable promoter system. Cdc53p-depleted cells displayed an invasive phenotype and constitutive filamentation under conditions favouring yeast growth mode, both on solid and in liquid media. In addition, these cells exhibited an early onset of cell death, as judged from propidium iodide staining, suggesting that CDC53 is an essential gene in C. albicans. To identify Cdc53p-dependent pathways in C. albicans, a genome-wide expression analysis was carried out that revealed a total of 425 differentially expressed genes (fold change â¥ 2, p-value â¤ 0.05) with 192 up- and 233 down-regulated genes in the CDC53-repressed mutant as compared to the control strain. GO term analysis identified biological processes significantly affected by Cdc53p depletion, including amino acid starvation response, with 14 genes being targets of the transcriptional regulator Gcn4p, and reductive iron transport. These results indicate that Cdc53p enables C. albicans to adequately respond to environmental signals. Two-strain experiment, CDC53-repressible cells vs. control cells, both grown in the presence of 20 Âµg/ml Doxycycline. Four independent biological replicates of total RNA of each strain, dye-swap.

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Gene expression in wild type and Cagal102 knockout Candida albicans strains.

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