Project description:Differential expression between monosoic derivative and parental strain of Candida albicans. The important human pathogen Candida albicans possesses an unusual form of gene regulation, in which the copy number of an entire specific chromosome or a large portion of a specific chromosome changes in response to a specific adverse environment, thus, assuring survival. In the absence of the adverse environment, the altered portion of the genome can be restored to its normal condition. One major question is how C. albicans copes with gene imbalance arising by transitory aneuploid states. Here, we compared transcriptomes from two copies of chromosome 5 (Ch5) in a normal diploid strain 3153A and from a single copy of Ch5 in representative derivative Sor55. Statistical analysis revealed that at least 40% of transcripts from the monosomic Ch5 are fully compensated to a disomic level, thus, indicating the existence of a genome-wide mechanism maintaining cell homeostasis. However, a minor portion of transcripts diminished twofold in accordance with what would be expected for Ch5 monosomy. Another minor portion of transcripts, unexpectedly, increased up to twofold and higher then the disomic level, demonstrating indirect control by monosomy. We suggest that C. albicans unusual regulation of gene expression by the loss and gain of entire chromosomes is coupled with widespread compensation of gene dosage at the transcriptional level.
Project description:We perform microarray analysis of HUVECs upon stimulation with virulent wildtype C. albicans strain SC5314 or its efg1/efg1 cph1/cph1 hyphal-deficient derivative strain CAN34 to compare the gene expression profiles elicited from HUVECs in response to these strains. In addition, these responses are compared to that of TNF-alpha induced responses to determine which responses are Candida-specific. Keywords: comparison of host response to different Candida albicans morphologies
Project description:Sorbose resistant Candida albicans mutant strain [Sor125(55)] derived from parental strain [3153A] has characteristic Ch5 monosomy plus Ch4/7b trisomy. ChIP-chip data showed marked elevation of H4 histone acetylation on monosomic Ch5 in Sor125(55) mutant compared with parental strain (3153A). There was no remarkable diffrence in H4 acetylation level on other chromosomes between those strains and no difference in H3 acetylation on all chromosomes.
Project description:To investigate the diversity of gene contents of Candida albicans strain by array-based comparative genomic hybridization (array CGH; aCGH).
Project description:To investigate the diversity of gene contents of Candida albicans strain by array-based comparative genomic hybridization (array CGH; aCGH).
Project description:To investigate the diversity of gene contents of Candida albicans strain by array-based comparative genomic hybridization (array CGH; aCGH).
Project description:Invasion of host tissue by the human fungal pathogen, Candida albicans is an important step during many forms of candidosis. However, not all C. albicans strains possess the same invasive and virulence properties. It is known for example that the two clinical isolates SC5314 and ATCC10231 differ in their ability to invade into host tissue and to cause infections. Strain SC5314 is invasive whereas strain ATCC10231 is non-invasive and strongly attenuated in virulence as compared to SC5314. In this study we compare the in vitro transcriptional profiles and the genotypic profiles of these two widely used laboratory strains in order to determine the principal biological and genetic properties which may govern the different potential for invasiveness and virulence. Keywords: transcriptional profiling, comparative genomic hybridisation, invasive vs. non-invasive C. albicans strain
Project description:The fungal pathogen Candida albicans produces dark-pigmented melanin when grown in a basal medium containing 1 mM l-DOPA as melanin substrate. In the widely used C. albicans strain SC5314, melanin appeared after 3-4 days of incubation in l-DOPA medium. The experiment was designed to reveal cadidate genes associated with melanin biosynthesis by expression profiling at different times of growth with and without L-DOPA added to the medium. Expression profiling of C. albicans revealed very few genes significantly up- or down-regulated by growth in l-DOPA.
