title: Rapid, high-throughput, multiplex, real-time PCR for identification of mutations in the cyp51A gene of Aspergillus fumigatus that confer resistance to itraconazole.
abstract: Aspergillus fumigatus is an important cause of life-threatening invasive fungal disease in patients with compromised immune systems. Resistance to itraconazole in A. fumigatus is closely linked to amino acid substitutions in Cyp51A that replace Gly54. In an effort to develop a new class of molecular diagnostic assay that can rapidly assess drug resistance, a multiplexed assay was established. This assay uses molecular beacons corresponding to the wild-type cyp51A gene and seven mutant alleles encoding either Arg54, Lys54, Val54, Trp54, or Glu54. Molecular beacon structure design and real-time PCR conditions were optimized to increase the assay specificity. The multiplex assay was applied to the analysis of chromosomal DNA samples from a collection of 48 A. fumigatus clinical and laboratory-derived isolates, most with reduced susceptibility to itraconazole. The cyp51A allelic identities for codon 54 were established for all of the strains tested, and mutations altering Gly54 in 23 strains were revealed. These mutations included G(54)W (n = 1), G(54)E (n = 12), G(54)K (n = 3), G(54)R (n = 3), and G(54)V (n = 4). Molecular beacon assay results were confirmed by DNA sequencing. Multiplex real-time PCR with molecular beacons is a powerful technique for allele differentiation and analysis of resistance mutations that is dynamic and suitable for rapid high-throughput assessment of drug resistance.
authors.affiliation: Public Health Research Institute, International Center for Public Health, 225 Warren St., Newark, NJ 07103, USA.
authors.forename: Sergey V
authors.initials: SV
authors.lastname: Balashov
authors.forename: Rebecca
authors.initials: R
authors.lastname: Gardiner
authors.forename: Steven
authors.initials: S
authors.lastname: Park
authors.forename: David S
authors.initials: DS
authors.lastname: Perlin
mesh_terms: D000935:Antifungal Agents / Q000494:pharmacology*; D001232:Aspergillus fumigatus / Q000187:drug effects* / Q000235:genetics; D003577:Cytochrome P-450 Enzyme System / Q000235:genetics*; D004271:DNA, Fungal / Q000032:analysis; D025141:Drug Resistance, Fungal / Q000235:genetics*; D005656:Fungal Proteins / Q000235:genetics*; D006801:Humans; D017964:Itraconazole / Q000494:pharmacology*; D008826:Microbial Sensitivity Tests; D015335:Molecular Probes; D009154:Mutation; D016133:Polymerase Chain Reaction / Q000379:methods*; D013997:Time Factors
chemical_list: D000935:Antifungal Agents; D004271:DNA, Fungal; D005656:Fungal Proteins; D015335:Molecular Probes; D017964:Itraconazole; D003577:Cytochrome P-450 Enzyme System; C465526:cytochrome P-450 CYP51A, Aspergillus