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Redalyc.Historia Y Descripción De Microsporum Fulvum, Una Especie Revista Argentina de Microbiología ISSN: 0325-7541 [email protected] Asociación Argentina de Microbiología Argentina NEGRONI, R.; BONVEHI, P.; ARECHAVALA, A. Historia y descripción de Microsporum fulvum, una especie válida del género descubierta en la República Argentina Revista Argentina de Microbiología, vol. 40, núm. 1, 2008, p. 47 Asociación Argentina de Microbiología Buenos Aires, Argentina Disponible en: http://www.redalyc.org/articulo.oa?id=213016786010 Cómo citar el artículo Número completo Sistema de Información Científica Más información del artículo Red de Revistas Científicas de América Latina, el Caribe, España y Portugal Página de la revista en redalyc.org Proyecto académico sin fines de lucro, desarrollado bajo la iniciativa de acceso abierto Imágenes microbiológicas ISSN 0325-754147 IMÁGENES MICROBIOLÓGICAS Revista Argentina de Microbiología (2008) 40: 47 Historia y descripción de Microsporum fulvum, una especie válida del género descubierta en la República Argentina Se presentan estas imágenes para destacar el interés de una especie válida del género Microsporum descrita por primera vez en 1909 por el dermatólogo argentino Julio Uriburu. Este espe- cialista formó parte del grupo inicial de médicos dedicados a la dermatología que fundaron la Asociación Argentina de Derma- tología, en 1907. Presentamos aquí al grupo de fundadores, entre los cuales se destacan, además de Uriburu, Pedro Baliña, Baldomero Sommer, Maximiliano Aberastury, Nicolás V. Greco y Pacífico Díaz. Este aislamiento corresponde al cultivo de una uña de pie, que es una localización sumamente infrecuente para hongos del género Microsporum. Debido a la similitud morfológica de esta especie con Figura 1. Fundadores de la Asociación Argentina de Dermatología Microsporum gypseum, algunos autores no aceptan su validez y De pie: Julio V. Uriburu, Carlos S. Seminario, Pedro L. Baliña, Nico- la incluyen dentro del complejo M. gypseum. Sin embargo, la lás V. Greco, Ernesto Polito, Ricardo Nölting, Angel M. Gimenez. forma teleomorfa es diferente y los estudios de biología molecular Sentados: Eudoro Cisneros, Maximiliano Aberastury, Baldomero han detectado diferencias en el ADN. Sommer, Pacífico Díaz, Manuel N. Moyano, Carlos Roche Microsporum fulvum: Uriburu, 1909 (1-3). Teleomorfo: Arthroderma fulvum. Weitzman, Mc Ginnis, Padhye y Ajello, 1986. Sinonimia. Forma teleomorfa: Nannizzia fulva, Stockdale, 1963. Nannizzia gypsea, Stockdale var. fulva Spinis, 1964. Posición sistemática. Forma anamorfa: Deuteromycotina, Hyphomycetes, Moniliales, Moniliaceae, Microsporum. Forma teleomorfa: Ascomycotina, Onygenales, Arthrodermatiaceae, Arthroderma. Identificación: produce invasión ectothrix de los cabellos, con esporos esparcidos. Las colonias son pulverulentas, de crecimiento rápido, color cremoso o pardo claro, con una parte periférica blan- quecina; el aspecto es más velloso que el de Microsporum gypseum. El reverso de la colonia es pardo-amarillento a rojo in- tenso. En la observación microscópica presenta numerosos macroconidios, más cilíndricos que los de M. gypseum, que po- seen hasta 7 septos internos; la pared de estos esporos es fina y rugosa. Los microconidios son piriformes o en forma de lágrima y Figura 2. Colonia gigante de M. fulvum en el medio de Sabouraud. no pueden diferenciarse de los de otras especies de dermatofitos. Puede presentar hifas en espiral. Produce in vitro órganos perforadores en cabellos humanos y es ureasa-positiva. En me- dios ricos en glucosa presenta rápidamente pleomorfismo. Es un hongo geófilo y menos virulento que M. gypseum, algunos auto- res lo incluyen como variedad del complejo M. gypseum. BIBLIOGRAFÍA 1. de Hoog GS, Guarro J, Gené J, Figueras MJ. Atlas of Clinical Fungi, 2nd ed. Centraalbureau voor Schimmelcultures, Utrecht, The Netherlands and Universitat Rovira i Virgili, Reus, Spain, 2000, p. 749. 2. Lacaz C da S, Porto E, Heins-Vaccari ME, Takahashi de Melo N. Guia para Identificação do Fungos, Actinomicetos e Algas de Interesse Médico. São Paulo, Brasil, SARVIER (FASESP), 1998, p. 67. 3. Larone, DH. Medically Important Fungi. A guide to identifi- cation. 4th ed. Washington DC, ASM Press, 2002, p. 236. Figura 3. Aspecto micromorfológico de M. fulvum a 400X. R. Negroni, P. Bonvehi, A. Arechavala. Centro de Estudios Micológicos. Pres. José E. Uriburu 1252 (C1114AAJ) Ciudad Autónoma de Buenos Aires, Argentina. E-mail: [email protected].
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