NDLI: Identification of Dermatophytes by an Oligonucleotide Array▿ †

Content Provider	PubMed Central
Author	Li, Hsin Chieh Jean-philippe, Bouchara Hsu, Mark Ming-long Barton, Richard Chang, Tsung Chain
Copyright Year	2007
Abstract	Species of dermatophytes are classified into three anamorphic (asexual) genera, Epidermophyton, Microsporum, and Trichophyton. Conventional methods used to identify dermatophytes are often lengthy and may be inconclusive because of atypical microscopic or colony morphology. Based on the internal transcribed spacer 1 (ITS-1) and ITS-2 sequences of the rRNA genes, an oligonucleotide array was developed to identify 17 dermatophyte species. The method consisted of PCR amplification of the ITS regions using universal primers, followed by hybridization of the digoxigenin-labeled PCR products to an array of oligonucleotides (17- to 30-mers) immobilized on a nylon membrane. Of 198 dermatophyte strains and 90 nontarget strains tested, the sensitivity and specificity of the array were 99.5% and 97.8%, respectively. The only strain not identified (Microsporum audouinii LMA 597) was found to have a nucleotide insertion at the ITS-2 region where the probe was designed. Two nontarget strains, Microsporum equinum LMA 40396666 and Trichophyton gourvilii var. intermedium CBS 170.65, were misidentified as Microsporum canis and Trichophyton soudanense, respectively. Sequence analysis of the ITS regions revealed that the two misidentified strains displayed high sequence homology with the probes designed for M. canis and T. soudanense, respectively. The present method can be used as a reliable alternative to conventional identification methods and can be completed with isolated colonies within 24 h.
Related Links	http://dx.doi.org/10.1128/jcm.00829-07
Ending Page	3166
Page Count	7
Starting Page	3160
File Format	PDF
ISSN	00951137
e-ISSN	1098660X
Journal	Journal of Clinical Microbiology
Issue Number	10
Volume Number	45
Language	English
Publisher	American Society for Microbiology
Publisher Date	2007-10-01
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Microbiology (medical) Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Microbiology (medical)

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