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Molecular characterization of Aspergilli isolated from outdoor air.
Journal de Mycologie Médicale 2018 October 4
Ubiquitous airborne conidia of the genus Aspergillus are responsible for a diverse group of human disorders from allergy to life treating invasive aspergillosis and mycotoxicoses. The aim of this study was to determine the population structure of Aspergillus isolated from outdoor air in Tehran by comparing the nucleotide sequences of ITS region and the PCR-RFLP molecular method. Internal transcribed spacer domains of 47 Aspergillus spp. were amplified and sequenced and PCR products were digested individually with restriction enzymes TaqI and EcoRI. For all species the PCR reaction produced a fragment of approximately 600bp in length. All of the nucleotide sequences were highly similar with the corresponding reference sequences registered at the gene bank. The all isolates displayed same banding pattern on the basis EcoR1 cleavage. While Taq1 enzyme profiling provided 5 different banding pattern. The results show that the A. niger section has the highest frequency with 27 isolates (57.4%). Of these, 23 isolates (48.9%) belonged to the A. niger complex and 4 isolates (8.5%) to the A. aculeatus complex. The A. flavus complex was also placed in the next ranking with 9 isolates (19.1%). These results strongly support the need for using molecular markers as an auxiliary tool in differentiating Aspergillus species.
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