Abstract
In this study, we investigated phylogenetic relationships among Italian Sporothrix schenckii isolates, by comparing their partial calmodulin sequences. In this analysis, we used 26 environmental strains of S. schenckii, plus two autochthonous clinical isolates. The results showed that our clinical strains grouped with S. schenckii sensu stricto isolates, whereas all 26 environmental isolates co-clustered with Sporothrix albicans (now regarded as a synonym of Sporothrix pallida), a non-pathogenic species closely related to S. schenckii. Furthermore, the group of environmental strains was found to be quite heterogeneous and further subdivided into two subgroups. The data reported here also showed that molecular methods, for specific identification of S. schenckii, developed before the description of its closely related species should be used with caution because of the possibility of false positive results, which could lead to inappropriate antifungal therapy. This study improves our understanding of the distribution of these new closely related Sporothrix species which also showed significant differences in antifungal susceptibilities.
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Acknowledgments
We thank Prof. Zoilo Pires De Camargo (Department of Microbiology, Immunology and Parasitology, Federal University of São Paulo, Brazil) for supplying S. brasiliensis SS74 and S. globosa SS49 strains; we are also grateful to Prof. Masako Kawasaki (Department of Dermatology, Kanazawa Medical University, Ishikawa, Japan) for generously providing us the strains: S. schenckii KMU975 and S. luriei KMU 2787 and for useful discussions. We also thank Prof. Josep Guarro (Unitat de Microbiologia, Facultat de Medicina i Ciències de la Salut, Universitat Rovira i Virgili, Reus, Spain) and Prof. Claudia Cafarchia (Faculty of Veterinary Medicine, University of Bari, Italy) for sending us the strains of S. mexicana FMR 9108 and S. schenckii CDM18, respectively.
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Romeo, O., Scordino, F. & Criseo, G. New Insight into Molecular Phylogeny and Epidemiology of Sporothrix schenckii Species Complex Based on Calmodulin-Encoding Gene Analysis of Italian Isolates. Mycopathologia 172, 179–186 (2011). https://doi.org/10.1007/s11046-011-9420-z
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DOI: https://doi.org/10.1007/s11046-011-9420-z