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• W2154425766 abstract "ABSTRACT Hypoxia is an environmental stress encountered by Aspergillus fumigatus during invasive pulmonary aspergillosis (IPA). The ability of this mold to adapt to hypoxia is important for fungal virulence and genetically regulated in part by the sterol regulatory element binding protein (SREBP) SrbA. SrbA is required for fungal growth in the murine lung and to ultimately cause lethal disease in murine models of IPA. Here we identified and partially characterized four genes ( dscA , dscB , dscC , and dscD , here referred to as dscA-D ) with previously unknown functions in A. fumigatus that are orthologs of the Schizosaccharomyces pombe genes dsc1 , dsc2 , dsc3 , and dsc4 ( dsc1-4 ), which encode a Golgi E3 ligase complex critical for SREBP activation by proteolytic cleavage. A. fumigatus null dscA-D mutants displayed remarkable defects in hypoxic growth and increased susceptibility to triazole antifungal drugs. Consistent with the confirmed role of these genes in S. pombe , both Δ dscA and Δ dscC resulted in reduced cleavage of the SrbA precursor protein in A. fumigatus . Inoculation of corticosteroid immunosuppressed mice with Δ dscA and Δ dscC strains revealed that these genes are critical for A. fumigatus virulence. Reintroduction of SrbA amino acids 1 to 425, encompassing the N terminus DNA binding domain, into the Δ dscA strain was able to partially restore virulence, further supporting a mechanistic link between DscA and SrbA function. Thus, we have shown for the first time the importance of a previously uncharacterized group of genes in A. fumigatus that mediate hypoxia adaptation, fungal virulence, and triazole drug susceptibility and that are likely linked to regulation of SrbA function." @default.
• W2154425766 created "2016-06-24" @default.
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• W2154425766 date "2012-12-01" @default.
• W2154425766 modified "2023-10-17" @default.
• W2154425766 title "Dsc Orthologs Are Required for Hypoxia Adaptation, Triazole Drug Responses, and Fungal Virulence in Aspergillus fumigatus" @default.
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• W2154425766 doi "https://doi.org/10.1128/ec.00252-12" @default.
• W2154425766 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3536281" @default.
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