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Journal of Clinical Microbiology, August 2005, p. 3760-3768, Vol. 43, No. 8
0095-1137/05/$08.00+0 doi:10.1128/JCM.43.8.3760-3768.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.
Identification of Medically Important Molds by an Oligonucleotide Array
Chen Ren Hsiao,1
Liyin Huang,1
Jean-Philippe Bouchara,2
Richard Barton,3
Hsin Chieh Li,1 and
Tsung Chain Chang1*
Department of Medical Laboratory Science and Biotechnology, School of Medicine, National Cheng Kung University, Tainan, Taiwan, Republic of China,1
Host-Parasite-Interaction Study Group (UPRES-EA 3142), Laboratory of Parasitology and Mycology, University Hospital, Angers, France,2
School of Biochemistry and Microbiology, University of Leeds, United Kingdom3
Received 22 February 2005/
Returned for modification 1 April 2005/
Accepted 2 May 2005
Infections caused by fungi have increased in recent years. Accurate and rapid identification of fungal pathogens is important for appropriate treatment with antifungal agents. On the basis of the internal transcribed spacer 1 (ITS 1) and ITS 2 sequences of the rRNA genes, an oligonucleotide array was developed to identify 64 species (32 genera) of clinically important filamentous (or dimorphic) fungi. These 64 species included fungi causing superficial, cutaneous, subcutaneous, and invasive infections. The method consisted of PCR amplification of the ITS regions using a pair of universal primers, followed by hybridization of the digoxigenin-labeled PCR products to a panel of species- or group-specific oligonucleotides immobilized on a nylon membrane. Of 397 fungal strains (290 target and 107 nontarget strains) tested, the sensitivity and specificity of the array was 98.3% (285/290) and 98.1% (105/107), respectively. Misidentified strains were usually those belonging to the same genus of the target species or having partial homology with oligonucleotide probes on the membrane. The whole procedure can be finished within 24 h starting from isolated colonies; reproductive structures, which are essential for the conventional identification methods, are not needed. In conclusion, the present array is a powerful tool for identification of clinically important filamentous fungi and may have the potential to be continually extended by adding further oligonucleotides to the array without significantly increasing the cost or complexity.
* Corresponding author. Mailing address: Department of Medical Laboratory Science and Biotechnology, School of Medicine, National Cheng Kung University, 1 University Road, Tainan 701, Taiwan, Republic of China. Phone: 886-6-2353535, ext. 5790. Fax: 886-6-2363956. E-mail:
tsungcha{at}mail.ncku.edu.tw.
Supplemental material for this article may be found at http://jcm.asm.org.
Journal of Clinical Microbiology, August 2005, p. 3760-3768, Vol. 43, No. 8
0095-1137/05/$08.00+0 doi:10.1128/JCM.43.8.3760-3768.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.
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