Variability of biochemical characteristics in strains of Trichophyton mentagrophytes

Ma, Calvo; Trape, J.; Abarca, M. L.; Cabañes, F. Javier; Rm, Calvo; Bruguera, T

doi:10.1007/bf00443514

Cited by 6 publications

(5 citation statements)

References 2 publications

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“…The name T. mentagrophytes is used for anamorphs of Arthroderma benhamiae , Arthroderma vanbreuseghemii and possibly of Arthroderma simii [11–14] as well. It is no surprise therefore that this so‐called T. mentagrophytes species complex [13–17] comprises dermatophytes that are not identical with regard to their genetic, morphological and physiological criteria [18, 19]. As a consequence, a number of more or less distinct varieties of T. mentagrophytes have been described in the course of time, some of which, such as Trichophyton quinckeanum and Trichophyton erinacei , had even been regarded as separate species initially [20, 21].…”

Section: Discussionmentioning

confidence: 99%

Case Report. Trichophyton mentagrophytes var. nodulare causing tinea pedis

Brasch

2001

Mycoses

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The identification of Trichophyton mentagrophytes var. nodulare is described, based on a strain recently isolated from tinea pedis. Different culture media and physiological tests were used in order to compare this strain with related strains. The main characteristics of T. mentagrophytes var. nodulare were its deep yellow-orange pigmentation, which was released from the mycelium, the flat growth of its colonies and the formation of nodular bodies. Supplementation of Sabouraud glucose agar with 3% NaCl reduced the aerial mycelium and stimulated the formation of conidia. Until now an identification of T. mentagrophytes var. nodulare based on DNA-patterns has not been published. Trichophyton mentagrophytes var. nodulare is supposed to be an anthropophilic dermatophyte causing ordinary tinea and onychomycosis. The low number of reports indicates that it is a very rare variety.

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Section: Discussionmentioning

confidence: 99%

Case Report. Trichophyton mentagrophytes var. nodulare causing tinea pedis

Brasch

2001

Mycoses

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“…17 The production of amylase was detected in T. mentagrophytes. 32 These fungi also produce kinases, including pseudokinases. These enzymes are involved in signalling and are necessary for adapting to the skin's niche.…”

Section: Enzymesmentioning

confidence: 99%

Conventional and natural compounds for the treatment of dermatophytosis

2019

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Dermatophytes are a group of pathogenic fungi that exclusively infect the stratum corneum of the skin, nails, and hair, causing dermatophytosis. Superficial skin infections caused by dermatophytes have increased in the last decades. There are conventional antifungals that treat these infections, such as terbinafine, fluconazole, and others. However, the limitations of these treatments (resistance, side effects and toxicity) along with the increasing over-prescription, the misuse of these antifungals and the high treatment costs led to the search for new, alternative, natural-based antifungal drugs. These have multiple mechanisms of action, which works to their advantage, making it difficult for a fungus to create resistance mechanisms against all of them at the same time. The main objective of this work is to provide a state-of-the-art review on dermatophytes, dermatophytosis, and the existing treatments, both conventional and natural, such as chitosan and essential oils.

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“…El SDA ha sido considerado como el mejor medio estandarizado para aislamientos primarios de dermatofitos (Calvo et al, 1986;Singh & Beena, 2003), sin embargo, comparado con los otros dos medios, observamos que no discrimina entre la variedad de pigmentos que pueden desarrollarse al reverso de la colonia para las especies del complex. Taplin et al (1969), evalúan el medio DTM estableciendo su eficiencia con respecto al SDA (p=0,05).…”

Section: Discusionunclassified

“…Según Calvo (1986), el medio SDA es ideal para el aislamiento primario de la especie T. mentagrophytes, situación que hemos observado en nuestra investigación donde los tres medios estudiados permiten una buena identificación y diferenciación de los integrantes de este complex (datos no publicados).…”

Section: Discusionunclassified

ANALISIS FENOTIPICO DEL COMPLEX Trichophyton rubrum EN LOS MEDIOS DE SABOURAUD, LACTRIMEL, Y LA TECNICA DE FISCHER & KANE: UNA EXPERIENCIA REGIONAL

2006

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Con el propósito de comparar el rendimiento y la eficiencia de los medios utilizados de rutina en el laboratorio de Micología para la identificación de las especies que integran el complex T. rubrum presentes en la V Región, Chile, seleccionamos: Agar glucosa Sabouraud (SDA), Agar Lactrimel (AL) y el medio sólido leche, glucosa, adicionado con el indicador de púrpura de bromocresol (Fischer & Kane, 1971) (BCP-MS-G). Estos fueron probados en 304 cepas consideradas como T. rubrum en el medio SDA, provenientes de pacientes dermatológicos. Los parámetros que se consideraron fueron rango de crecimiento, pigmentación al reverso de las colonias y presencia de fructificaciones. Las variedades del complex identificadas fueron T. rubrum var. algodonosa (72,4%) y T. rubrum var. granular (14,5%) además de integrantes del complex T. mentagrophytes (13,2%) que no se consideraron en el estudio. La zona anatómica más afectada fueron las uñas de los pies (80,7%). La fructificación en los 3 medios fue considerada como el «gold standard» y en base a este criterio se estableció su sensibilidad y especificidad, obteniéndose para la var. granular una especificidad de un 100, 98,6 y 83,9% en BCP-MS-G, AL y SDA, respectivamente. Para la var. algodonosa, la mayor sensibilidad se obtuvo en BCP-MS-G (71,9%), pero con una nula especificidad, por lo que se sugiere considerar el rango de crecimiento limitado a los 7 días y la pigmentación al reverso de la colonia en este medio. La identificación fue

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Variability of biochemical characteristics in strains of Trichophyton mentagrophytes

Cited by 6 publications

References 2 publications

Case Report. Trichophyton mentagrophytes var. nodulare causing tinea pedis

Case Report. Trichophyton mentagrophytes var. nodulare causing tinea pedis

Conventional and natural compounds for the treatment of dermatophytosis

ANALISIS FENOTIPICO DEL COMPLEX Trichophyton rubrum EN LOS MEDIOS DE SABOURAUD, LACTRIMEL, Y LA TECNICA DE FISCHER & KANE: UNA EXPERIENCIA REGIONAL

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