Isolation and molecular characterization of clinical and environmental dematiaceous fungi and relatives from Iran

Document Type : Original Articles

Authors

1 Department of Medical Parasitology and Mycology, School of Medicine, Jahrom University of Medical Sciences, Jahrom, Iran

2 Mazandaran university of medical sciences

3 University of Medical Sciences, Bushehr, Iran

4 General Medical Education and Research Center, Teikyo University, Tokyo, Japan

5 Cellular and Molecular Research Center, Yasuj University of Medical Sciences, Yasuj, Iran

6 Department of Environmental Health Engineering, School of Public Health, Isfahan University of Medical Sciences, Isfahan, Iran

7 5) Department of Medical Mycology and Parasitology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran

8 National Institute of Health Research Isfahan Health Research Station, Tehran University of Medical Sciences, Tehran, Iran

9 Department of Parasitology and Mycology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran.

10 Department of Medical Parasitology & Mycology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran

11 Laboratory of Space and Environmental Medicine, Graduate School of Medicine, Teikyo University, Tokyo, Japan. 5 General Medical Education and Research Center, Teikyo University, Tokyo, Japan

10.18502/cmm.7.3.7798

Abstract

Background and Purpose: The frequency and genetic diversity of black fungi in environmental and clinical settings have not been fully studied in Iran. This study aimed to identify and evaluate intra- and inter-species DNA sequence variation and also understand the phylogenetic relationships of melanized fungi and relatives isolated from different geographical regions of Iran.
Materials and Methods: In total, 111 clinical and environmental strains of dematiaceous fungi were isolated, and their internal transcribed spacer ribosomal DNA(rDNA) regions were sequenced and analyzed.
Results: An inter-species nucleotide sequence diversity rate of 1 to 464 nucleotides was observed between the species. Intra-species differences were found in the strains of Alternaria alternata, Cladosporium cladosporioides, Alternaria tenuissima, Curvularia spicifera, Aureobasidium pullulans, Curvularia hawaiiensis, Neoscytalidium dimidiatum,
Alternaria terricola, Alternaria chlamydospora, Didymella glomerata, and Drechslera dematioidea by 0–59, 0–22, 0–4, 0–4, 0–3, 0–2, 0–2, 0–2, 0–2, 0–1, and 0–1 nt, respectively.
Conclusion: The internal transcribed spacer rDNA is useful for the discrimination of several taxa of dematiaceous fungi. However, a better understanding of the taxonomy of species of Alternaria requires a larger rDNA region or a library of other gene sequences.
 

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