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Series GSE22052 Query DataSets for GSE22052
Status Public on Jul 01, 2010
Title Aspergillus fumigatus HapX-mediated iron starvation adaption is required for virulence.
Platform organism Aspergillus fumigatus Af293
Sample organism Aspergillus fumigatus
Experiment type Expression profiling by array
Summary Iron is an essential cofactor for a wide range of cellular processes. Previous studies have shown that siderophore-mediated uptake and intracellular handling of iron are crucial for virulence of Aspergillus fumigatus. Here we show that the bzip-type transcription factor HapX plays a crucial role in the transcriptional remodeling required for adaption to iron starvation in this opportunistic fungal pathogen. HapX was found to be interconnected in a negative feed-back loop with the previously identified iron regulator SreA: SreA repressed expression of hapX during iron sufficiency and HapX repressed sreA during iron starvation. Genome-wide transcriptional profiling and analysis of selected metabolites (protophorphyrine IX, siderophores and amino acids) indicated extensive metabolic remodeling in response to iron starvation. HapX was found to participate in both, repression and activation of genes during iron starvation. HapX was in particular required for repression of iron-dependent and mitochondrial-localized activities including respiration, TCA cycle, amino acid metabolism, iron-sulfur-cluster biosynthesis and heme biosynthesis. Pathways positively affected by HapX included production of siderophores and the ribotoxin and major allergen AspF1. Analysis of the free amino acid pool revealed HapX-dependent coordination of the production of siderophores with the supply of its precursor ornithine. Consistent with the hapX expression pattern, HapX-deficiency was deleterious with respect to growth rate and conidiation during iron depleted but not iron-replete conditions. HapX-deficiency caused significant attenuation of virulence in a murine model aspergillosis underlining that A. fumigatus faces iron starvation in the host and that the HapX-dependent metabolic reprogramming is therefore crucial for virulence.
 
Overall design A. fumigatus 293 and hapX mutants were grown in the presence and absence of iron and in cultures shifted from no iron to iron-containing conditions after 1 h incubation. Hybridizations were performed with biological replicates for wt vs hapX +/- iron. For the iron-shift experiments, there were biological replicates for wt in both conditions and for hapX in -iron but there was only a single biological sample for hapX iron-shift sample. All hybs were performed with flip-dye pairs.
 
Contributor(s) Varga JJ, Beckmann N, Gsalla F, Schrettl M, Heinekamp T, Jacobsen ID, Moussa TA, Wang S, Werner ER, Nierman WC, Brakhage AA, Haas H
Citation(s) 20941352
Submission date May 28, 2010
Last update date Mar 22, 2012
Contact name John Varga
E-mail(s) j.varga@yahoo.com
Organization name Emory University
Department Pediatrics
Lab Goldberg
Street address 1510 Clifton Road
City Atlanta
State/province GA
ZIP/Postal code 30324
Country USA
 
Platforms (1)
GPL10341 JCVI Aspergillus fumigatus AF293 29.9K amplicon array
Samples (8)
GSM548300 AF293 compared to hapX mutant in the presence of iron, replicate 1
GSM548301 AF293 compared to hapX mutant in the presence of iron, replicate 2
GSM548302 AF293 adaptation from iron- to iron+ conditions, replicate 1
Relations
BioProject PRJNA128985

Download family Format
SOFT formatted family file(s) SOFTHelp
MINiML formatted family file(s) MINiMLHelp
Series Matrix File(s) TXTHelp

Supplementary file Size Download File type/resource
GSE22052_RAW.tar 13.1 Mb (http)(custom) TAR (of MEV)
Processed data included within Sample table

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