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Identification of yeast isolated from dermatological patients by MALDI-TOF mass spectrometry.
MedLine Citation:
PMID:  21848605     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Species identification of yeasts is based on biochemical (e.g. API ID 32 C(®) , bioMérieux) and molecular biological approaches. As an alternative to DNA-dependent methods, mass spectral analysis based identification of micro-organisms has become increasingly recognized. In a number of studies, matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) has been applied for the rapid classification and identification of micro-organisms. In this study, the applicability of MALDI-TOF MS for identifying yeasts isolated from dermatological patients was analysed and compared with the results from the API ID 32 C(®) system. Furthermore, sequencing the internal transcribed spacer (ITS) regions of the ribosomal DNA was employed as reference method. Candida (C.) albicans was isolated in 41.9% of all cases, C. parapsilosis in 20.3%, C. glabrata in 10.8%, and C. krusei in 6, 8.1%. Rarely isolated yeasts were Candida colliculosa, famata, guilliermondii, lusitaniae, and tropicalis as well as Geotrichum candidum, Rhodotorula mucilaginosa and Trichosporon mucoides. The MALDI TOF results were equal to the results gained by ITS sequence analysis in 94%, whereas API ID 32 C(®) provided the correct diagnosis in 84.3% (of all cases). This lower identification rate is mostly referable to frequent misidentifications of C. krusei as C. inconspicua/norvegensis,Candida tropicalis, or Geotrichum capitatum. In contrast, all C. krusei strains were correctly identified by MALDI TOF MS. In conclusion, species identification by MALDI-TOF MS was proven to be consistent with ITS sequence analysis; the technique has a resolving power comparatively as high as ITS sequence analysis.
Authors:
Florian Seyfarth; Cornelia Wiegand; Marcel Erhard; Yvonne Gräser; Peter Elsner; Uta-Christina Hipler
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-8-17
Journal Detail:
Title:  Mycoses     Volume:  -     ISSN:  1439-0507     ISO Abbreviation:  -     Publication Date:  2011 Aug 
Date Detail:
Created Date:  2011-8-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8805008     Medline TA:  Mycoses     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2011 Blackwell Verlag GmbH.
Affiliation:
Universitätsklinikum Jena, Klinik für Hautkrankheiten, Jena, Germany bioMerieux SA; R/D Microbiology, La Balme Les Grottes, France Charité- Universitätsmedizin Berlin, Institut für Mikrobiologie und Hygiene, Berlin, Germany.
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