Identification of Genes in Candida glabrata Conferring Altered Responses to Caspofungin, a Cell Wall Synthesis Inhibitor
| Autor: | Rocco Ferrandino, Ronda J. Rolfes, Maedeh Mohammednetej, Shemona Rattila, Waseem Nosair, Erica L. Gerace, Gaurav Arora, Amanda Zirzow Subic, Anne G. Rosenwald |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
Antifungal Agents Echinocandin 030106 microbiology Saccharomyces cerevisiae Mutant Candida glabrata Microbial Sensitivity Tests QH426-470 Investigations echinocandins 03 medical and health sciences chemistry.chemical_compound Lipopeptides Caspofungin Cell Wall Drug Resistance Fungal medicine Genetics Humans Molecular Biology Gene Genetics (clinical) cell wall integrity pathway biology Candidiasis biology.organism_classification Phenotype chemistry Echinocandins high affinity calcium uptake system medicine.drug |
| Zdroj: | G3: Genes|Genomes|Genetics G3: Genes, Genomes, Genetics, Vol 6, Iss 9, Pp 2893-2907 (2016) |
| ISSN: | 2160-1836 |
| Popis: | Candida glabrata is an important human fungal pathogen whose incidence continues to rise. Because many clinical isolates are resistant to azole drugs, the drugs of choice to treat such infections are members of the echinocandin family, although there are increasing reports of resistance to these drugs as well. In efforts to better understand the genetic changes that lead to altered responses to echinocandins, we screened a transposon-insertion library of mutants for strains to identify genes that are important for cellular responses to caspofungin, a member of this drug family. We identified 16 genes that, when disrupted, caused increased tolerance, and 48 genes that, when disrupted, caused increased sensitivity compared to the wild-type parental strain. Four of the genes identified as causing sensitivity are orthologs of Saccharomyces cerevisiae genes encoding proteins important for the cell wall integrity (CWI) pathway. In addition, several other genes are orthologs of the high affinity Ca2+ uptake system (HACS) complex genes. We analyzed disruption mutants representing all 64 genes under 33 different conditions, including the presence of cell wall disrupting agents and other drugs, a variety of salts, increased temperature, and altered pH. Further, we generated knockout mutants in different genes within the CWI pathway and the HACS complex, and found that they too exhibited phenotypes consistent with defects in cell wall construction. Our results indicate that small molecules that inhibit the CWI pathway, or that the HACS complex, may be an important means of increasing the efficacy of caspofungin. |
| Databáze: | OpenAIRE |
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