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Molecular detection of dermatophytes and nondermatophytes in onychomycosis by nested polymerase chain reaction based on 28S ribosomal RNA gene sequences

Ebihara, M. ; Makimura, K. ; Sato, K. ; Abe, S. ; Tsuboi, R.

British journal of dermatology (1951), 2009-11, Vol.161 (5), p.1038-1044 [Periódico revisado por pares]

Oxford, UK: Blackwell Publishing Ltd

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Título:
Molecular detection of dermatophytes and nondermatophytes in onychomycosis by nested polymerase chain reaction based on 28S ribosomal RNA gene sequences
Autor: Ebihara, M. ; Makimura, K. ; Sato, K. ; Abe, S. ; Tsuboi, R.
Assuntos: Adult ; Aged ; Aged, 80 and over ; Aspergillus ; Aspergillus - isolation & purification ; Biological and medical sciences ; Candida ; Candida albicans ; Dermatology ; DNA Primers - genetics ; DNA, Fungal - analysis ; Female ; Fusarium ; Fusarium solani ; Human mycoses ; Humans ; Infectious diseases ; Male ; Medical sciences ; Microscopy ; Middle Aged ; Miscellaneous mycoses ; Mycoses ; Mycoses of the skin ; nondermatophyte ; Nucleotide sequence ; Onychomycosis ; Onychomycosis - diagnosis ; Onychomycosis - microbiology ; Polymerase chain reaction ; Polymerase Chain Reaction - methods ; Primers ; RNA, Ribosomal, 28S - genetics ; rRNA 28S ; Scopulariopsis brevicaulis ; Trichophyton - genetics ; Trichophyton - isolation & purification ; Trichophyton rubrum ; Young Adult
É parte de: British journal of dermatology (1951), 2009-11, Vol.161 (5), p.1038-1044
Notas: ark:/67375/WNG-C6CB4BBC-4
ArticleID:BJD9249
istex:FB34B2A8D519C8EAF069B51056BD4CBA408DA3E1
Conflicts of interest None declared.
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Descrição: Summary Background Onychomycosis is often caused by dermatophytes, but the role of nondermatophytes is underestimated due to the difficulty of identifying them by conventional direct microscopy and culture. Objectives This study aims to detect nondermatophytes, as well as dermatophytes, in the nail samples of patients with onychomycosis using a polymerase chain reaction (PCR)‐based culture‐independent method. Materials and methods The nested PCR assay targeting the sequence of the 28S ribosomal RNA gene was used to amplify fungal DNAs from 50 microscopy‐positive nail specimens. Newly designed primer sets for dermatophyte universal, Trichophyton rubrum, T. mentagrophytes, Aspergillus spp., Scopulariopsis brevicaulis, Fusarium solani, F. oxysporum, F. verticillioides, Candida albicans and C. tropicalis were used after confirmation of their specificity. Results Forty‐seven cases (94%) were positive for fungal DNA, among which dermatophytes were detected in 39 cases (83·0%): T. rubrum in 35 cases (74·5%) and T. mentagrophytes in eight cases (17·0%). Surprisingly, nondermatophytes were detected in 18 cases (38·3%), both dermatophytes and nondermatophytes in 10 cases (21·3%) and nondermatophytes alone in eight cases (17·0%). Aspergillus spp. alone was observed in five cases (10·6%). Conclusions This study indicates that most of the affected nail plates of patients with onychomycosis were positive for specific fungal DNAs, and suggests that nondermatophytes detected at high rates may be involved in the pathogenesis of onychomycosis.
Editor: Oxford, UK: Blackwell Publishing Ltd
Idioma: Inglês

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Molecular detection of dermatophytes and nondermatophytes in onychomycosis by nested polymerase chain reaction based on 28S ribosomal RNA gene sequences

Ebihara, M. ; Makimura, K. ; Sato, K. ; Abe, S. ; Tsuboi, R.

Oxford, UK: Blackwell Publishing Ltd

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