Abstract
This study demonstrates the capacity of the one-step polymerase chain reaction (PCR) fingerprinting method using the microsatellite primers (GACA)4 or (GTG)5 (MSP-PCR) to identify six of the most frequent dermatophyte species causing cutaneous mycosis. PCR with (GACA)4 was a suitable method to recognise Microsporum canis, Microsporum gypseum, Trichophyton rubrum and Trichophyton interdigitale among 82 Argentinian clinical isolates, producing the most simple and reproducible band profiles. In contrast, the identification of Trichophyton mentagrophytes and Trichophyton tonsurans was achieved using PCR with (GTG)5. In this way, the sequential application of PCR using (GACA)4 and (GTG)5 allowed the successful typification of clinical isolates which had not been determined by mycological standard techniques. In this work, the intraspecies variability among 33 clinical isolates of M. canis was detected using random amplification of polymorphic DNA (RAPD-PCR) with the primers OPI-07 and OPK-20. The genetic variations in the isolates of M. canis were not associated with clinical features of lesions or pet ownership, but a geographical restriction of one genotype was determined with OPK-20, suggesting a clonal diversity related to different ecological niches in certain geographical areas. The results of this work demonstrate that the detection of intraspecies polymorphisms in M. canis by RAPD-PCR may be applied in future molecular epidemiological studies to identify endemic strains, the route of infection in an outbreak or the coexistence of different strains in a single infection.
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Acknowledgements
This work was supported by Programa de Subsidios a Proyectos de Extensión (SEU-UNC) and PID 2012-2013 (Secyt-UNC). M.F.S. was a fellow of Secyt-UNC. V.L.B. is a fellow of CONICET. D.T.M. and L.S.C. are members of the Research Career of CONICET.
We thank the native English speaker, Dr. Paul Hobson, for revising the manuscript.
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The authors declare that they have no conflict of interest.
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Spesso, M.F., Nuncira, C.T., Burstein, V.L. et al. Microsatellite-primed PCR and random primer amplification polymorphic DNA for the identification and epidemiology of dermatophytes. Eur J Clin Microbiol Infect Dis 32, 1009–1015 (2013). https://doi.org/10.1007/s10096-013-1839-3
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DOI: https://doi.org/10.1007/s10096-013-1839-3