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Aspergillus fumigatus is the Aspergillus species most commonly associated with aspergillosis. Of the various presentations of aspergillosis, one of the most frequently observed in cases involving A. fumigatus pulmonary infections is aspergilloma (PA). In such infections one finds a fungus ball composed of fungal hyphae, inflammatory cells, fibrin, mucus, and tissue debris. Chronic necrotizing pulmonary aspergillosis (CNPA), also known as semi-invasive or invasive aspergillosis, is locally invasive and predominantly seen in patients with mild immunodeficiency or with a chronic lung disease. In the present study, with the aid of a next-generation sequencer, we conducted whole genome sequence (WGS) analyses of 17 strains isolated from patients in Japan with PA and CNPA. A total of 99,088 SNPs were identified by mapping the reads to A. fumigatus genome reference strain Af293, and according to genome-wide phylogenetic analysis, there were no correlations between the whole genome sequence typing results and pathologic conditions of patients. Here, we conducted the first multi-genome WGS study to focus on the A. fumigatus strains isolated from patients with PA and CNPA, and comprehensively characterized genetic variations of strains. WGS approach will help in better understanding of molecular mechanisms of aspergillosis cases caused by A. fumigatus.

medical mycology

Genome sequence comparison of Aspergillus fumigatus strains isolated from patients with pulmonary aspergilloma and chronic necrotizing pulmonary aspergillosis