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Unknown,Transcriptomics,Genomics,Proteomics

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Transcription profiling of Candida albicans clinical isolates grown under identical growth conditions in NGY medium

ABSTRACT: Comparison of clinical isolates grown under identical growth conditions

ORGANISM(S): Candida albicans

SUBMITTER: AFG AFG

PROVIDER: E-MEXP-1931 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Property differences among the four major Candida albicans strain clades.

MacCallum Donna M DM Castillo Luis L Nather Kerstin K Munro Carol A CA Brown Alistair J P AJ Gow Neil A R NA Odds Frank C FC

Eukaryotic cell 20090116 3

A selection of 43 Candida albicans isolates, chosen to represent the four major strain clades of the species and also intraclade diversity, was screened for their virulence in the murine intravenous challenge model of C. albicans infection, for a range of properties measurable in vitro that might relate to virulence, and for the numbers of midrepeat sequences in genes of the ALS and HYR families. Heterozygosity at the mating type locus and low whole-cell acid phosphatase activity and growth rate ...[more]

PMID: 19151328

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Project description:Based on studies in S. pombe (Chen et al., 2003), we predicted that conditions which activate C. albicans Hog1 would result in the induction of a common set of genes that are regulated by this SAPK (Smith et al., 2004). Hence in this study we compared the global transcriptional responses of wild-type and hog1 C. albicans cells to environmental stresses that are known to activate the Hog1 SAPK. We compared the homozygous hog1/hog1 null mutant (JC50) with the isogenic HOG1 reintegrant (hog1/hog1/HOG1: JC52) because this controlled for any secondary mutations that might have been introduced during the construction of the null mutant. We have shown that this reintegrant is indistinguishable from its parental wild-type strain RM1000 (HOG1/HOG1) with respect to their stress phenotypes (Smith et al., 2004) and their expression of stress genes (Supplementary Data). Three conditions were chosen for transcript profiling: osmotic stress imposed by 0.3 M NaCl, oxidative stress imposed by 5 mM H2O2, and heavy metal stress imposed by 0.5 mM CdSO4. Each of these treatments stimulates the phosphorylation and nuclear accumulation of this Hog1 SAPK within a 10-min time frame (Smith et al., 2004). Furthermore, significant differences in stress regulated gene expression are observed within this time scale (Enjalbert et al., 2003; Smith et al., 2004). Hence, we analyzed the C. albicans transcriptome after a 10-min exposure to each stress condition. Although some stress genes might be missed by analyzing a single time point, most C. albicans stress genes are induced within 10 min (Enjalbert et al., 2003). At least four independent biological replicates were analyzed for each condition

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