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Type: Journal article
Title: Rapid identification and differentiation of Ttichophyton species, based on sequence Polymorphisms of the ribosomal internal transcribed spleacer regions, by rolling-circle amplification
Author: Kong, F.
Tong, Z.
Chen, X.
Sorrell, T.
Wang, B.
Wu, Q.
Ellis, D.
Chen, S.
Citation: Journal of Clinical Microbiology, 2008; 46(4):1192-1199
Publisher: Amer Soc Microbiology
Issue Date: 2008
ISSN: 0095-1137
Statement of
Fanrong Kong, Zhongsheng Tong, Xiaoyou Chen, Tania Sorrell, Bin Wang, Qixuan Wu, David Ellis and Sharon Chen
Abstract: DNA sequencing analyses have demonstrated relatively limited polymorphisms within the fungal internal transcribed spacer (ITS) regions among Trichophyton spp. We sequenced the ITS region (ITS1, 5.8S, and ITS2) for 42 dermatophytes belonging to seven species (Trichophyton rubrum, T. mentagrophytes, T. soudanense, T. tonsurans, Epidermophyton floccosum, Microsporum canis, and M. gypseum) and developed a novel padlock probe and rolling-circle amplification (RCA)-based method for identification of single nucleotide polymorphisms (SNPs) that could be exploited to differentiate between Trichophyton spp. Sequencing results demonstrated intraspecies genetic variation for T. tonsurans, T. mentagrophytes, and T. soudanense but not T. rubrum. Signature sets of SNPs between T. rubrum and T. soudanense (4-bp difference) and T. violaceum and T. soudanense (3-bp difference) were identified. The RCA assay correctly identified five Trichophyton species. Although the use of two "group-specific" probes targeting both the ITS1 and the ITS2 regions were required to identify T. soudanense, the other species were identified by single ITS1- or ITS2-targeted species-specific probes. There was good agreement between ITS sequencing and the RCA assay. Despite limited genetic variation between Trichophyton spp., the sensitive, specific RCA-based SNP detection assay showed potential as a simple, reproducible method for the rapid (2-h) identification of Trichophyton spp.
Keywords: Humans; Trichophyton; DNA, Fungal; DNA, Ribosomal Spacer; Mycological Typing Techniques; Sensitivity and Specificity; Reproducibility of Results; Nucleic Acid Amplification Techniques; Sequence Analysis, DNA; Species Specificity; Polymorphism, Single Nucleotide; Time Factors; Molecular Sequence Data; Genetic Variation
Rights: Copyright © 2008, American Society for Microbiology. All Rights Reserved.
RMID: 0020080552
DOI: 10.1128/JCM.02235-07
Appears in Collections:Molecular and Biomedical Science publications

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