Comparative analyses of classical phenotypic method and ribosomal RNA gene sequencing for identification of medically relevant Candida species
Mem. Inst. Oswaldo Cruz
;
108(2): 178-185, abr. 2013. tab, graf
Article
Dans Anglais
| LILACS
| ID: lil-670399
ABSTRACT
As the distribution of Candida species and their susceptibility to antifungal agents have changed, a new means of accurately and rapidly identifying these species is necessary for the successful early resolution of infection and the subsequent reduction of morbidity and mortality. The current work aimed to evaluate ribosomal RNA gene sequencing for the identification of medically relevant Candida species in comparison with a standard phenotypic method. Eighteen reference strains (RSs), 69 phenotypically identified isolates and 20 inconclusively identified isolates were examined. Internal transcribed spaces (ITSs) and D1/D2 of the 26S ribosomal RNA gene regions were used as targets for sequencing. Additionally, the sequences of the ITS regions were used to establish evolutionary relationships. The sequencing of the ITS regions was successful for 88% (94/107) of the RS and isolates, whereas 100% of the remaining 12% (13/107) of the samples were successfully analysed by sequencing the D1/D2 region. Similarly, genotypic analysis identified all of the RS and isolates, including the 20 isolates that were not phenotypically identified. Phenotypic analysis, however, misidentified 10% (7/69) of the isolates. Phylogenetic analysis allowed the confirmation of the relationships between evolutionarily close species. Currently, the use of genotypic methods is necessary for the correct identification of Candida species.
Texte intégral:
Disponible
Indice:
LILAS (Amériques)
Sujet Principal:
Candida
/
ADN fongique
/
Gènes d'ARN ribosomique
/
Espaceur de l'ADN ribosomique
Type d'étude:
Etude diagnostique
Limites du sujet:
Humains
langue:
Anglais
Texte intégral:
Mem. Inst. Oswaldo Cruz
Thème du journal:
Médecine tropicale
/
Parasitologie
Année:
2013
Type:
Article
Pays d'affiliation:
Argentine
Institution/Pays d'affiliation:
Instituto Nacional de Enfermedades Infecciosas Dr Carlos G Malbrán/AR
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