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Journal of Clinical Microbiology, February 2005, p. 551-555, Vol. 43, No. 2
0095-1137/05/$08.00+0     doi:10.1128/JCM.43.2.551-555.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Multiple Genetically Distinct Groups Revealed among Clinical Isolates Identified as Atypical Aspergillus fumigatus

Margaret E. Katz,1* Annette M. Dougall,1 Kerry Weeks,2 and Brian F. Cheetham1

Molecular and Cellular Biology Division, School of Biological, Biomedical and Molecular Sciences, University of New England, Armidale,1 Mycology Reference Laboratory, Pacific Laboratory Medicine Services, The Royal North Shore Hospital of Sydney, St. Leonards, New South Wales, Australia2

Received 21 January 2004/ Returned for modification 8 March 2004/ Accepted 16 September 2004

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.

* Corresponding author. Mailing address: Department of Molecular and Cellular Biology, University of New England, Armidale, NSW 2351, Australia. Phone: (61) 2-6773-3016. Fax: (61) 2-6773-3267. E-mail: mkatz{at}metz.une.edu.au.

Journal of Clinical Microbiology, February 2005, p. 551-555, Vol. 43, No. 2
0095-1137/05/$08.00+0     doi:10.1128/JCM.43.2.551-555.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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