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Title: Multiple genetically distinct groups revealed among clinical isolates identified as atypical Aspergillus fumigatus
Contributor(s): Katz, ME (author); Dougall, AM (author); Weeks, K (author); Cheetham, BF (author)
Publication Date: 2005
DOI: 10.1128/JCM.43.2.551-555.2005
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Abstract: To investigate whether genetic variants of A. fumigatus are found among clinical isolates, four isolates that were originally identified as poorly sporulating strains of Aspergillus fumigatus were subjected to molecular analysis. DNA sequence analysis of the alkaline protease genes of these isolates showed that each is genetically distinct and each shows substantial variation (7 to 11%) from the A. fumigatus nucleotide sequence. Subsequent morphological examination suggested that all of the isolates could be classified as Aspergillus viridinutans. To clarify the taxonomic status of these four clinical isolates and of two previously identified as atypical A. fumigatus isolates, partial ß-tubulin and 18S rRNA gene sequences were determined. Each of the six atypical strains had a unique ß-tubulin sequence, whereas the sequences of three standard isolates of A. fumigatus, which were included as controls, were identical to the published A. fumigatus ß-tubulin sequence. The very low level of DNA sequence variation detected in standard isolates of A. fumigatus compared with other isolates from members of Aspergillus section Fumigati suggests that it may be a relatively recently evolved species. The 18S rRNA gene of two of the atypical isolates differed from that of A. fumigatus at a single nucleotide position. Phylogenetic analyses do not support the classification of all of these isolates as A. viridinutans. Thus, some of these isolates represent new species which are potential opportunistic pathogens.
Publication Type: Journal Article
Source of Publication: Journal of Clinical Microbiology, 43(2), p. 551-555
Publisher: American Society for Microbiology
Place of Publication: Washington, USA
ISSN: 0095-1137
Field of Research (FOR): 110899 Medical Microbiology not elsewhere classified
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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