The anamorph of Arthroderma benhamiae is an upcoming zoophilic dermatophyte that only in recent years has gained importance as a cause of tinea in humans. Its identification by conventional methods can cause problems. In this study we have subjected seven genetically confirmed strains of A. benhamiae anamorphs from northern Germany recently identified in our laboratory to a comprehensive assessment. Their macroscopic and microscopic morphology was checked on various agars and enzyme release stimulated by substrates with keratin, hair perforation and other physiological characteristics were tested. All strains were related to the previously described yellow phenotype of the A. benhamiae anamorph and showed a high resemblance among themselves. Coherent features were their uniform thallus morphology on Sabouraud glucose agar with yellow pigmentation, the formation of circuit-like hyphal structures and hyphal connections that had not been described previously, a lack of conidia, thiamine dependence, the spectrum of released enzymes and a good growth on human stratum corneum. With exception of the latter two these criteria are suggested for the identification of this anamorph phenotype that should be evaluated by future observations. Different phenotypes of the A. benhamiae anamorph may prevail in other geographic regions.
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http://dx.doi.org/10.1111/myc.12280 | DOI Listing |
Mycoses
January 2025
Mycology Reference Laboratory, Isfahan University of Medical Sciences, Isfahan, Iran.
Background: Trichophyton indotineae, formerly described as T. mentagrophytes rDNA-ITS genotype VIII, has recently been identified as a novel species within the T. mentagrophytes complex.
View Article and Find Full Text PDFMicrob Pathog
December 2024
Invasive Fungi Research Center, Communicable Diseases Institute/Department of Medical Mycology, School of Medicine, Mazandaran University of Medical Sciences, Sari, Iran. Electronic address:
Keratinophilic fungi, or dermatophytes, are recognized as the predominant fungal agents responsible for superficial skin diseases globally. The identification of species of dermatophytes is crucial for both therapeutic and epidemiological considerations. The primary objective of the present study was to investigate the epidemiology of dermatophytosis among patients who sought medical attention at the medical mycology laboratory in Golestan province.
View Article and Find Full Text PDFMed Mycol Case Rep
December 2024
Laboratorio de Microbiología Clínica y Microbioma, Escuela de Medicina Veterinaria, Facultad de Ciencias de la Vida, Universidad Andrés Bello, Av. Lo Pinto s/n. Colina, Santiago, 8370134, Chile.
Fungal infections in marine animals, particularly pinnipeds, have seen a notable increase, often linked to compromised immune systems in captive environments. species, while common in terrestrial mammals, have sporadically caused dermatophytosis in pinnipeds. A South American sea lion () presented with infection, marking the first such case in this species.
View Article and Find Full Text PDFJ Invest Dermatol
August 2024
Fundamental and Applied Research for Animals & Health, Faculty of Veterinary Medicine, University of Liège, Liège, Belgium.
Increasing resistance of dermatophytes against antifungals creates global public health problems, rendering essential a better understanding of virulence mechanisms and factors determining host specificity of dermatophytes. Because dermatophytes switch from a saprophytic to a parasitic lifestyle by reprogramming gene expression, reliable experimental models are needed to investigate the pathogenesis of dermatophytosis. In this study, a relevant mouse model of Trichophyton benhamiae dermatophytosis was assessed, together with a model based on reconstructed human epidermis, allowing their respective validation regarding fungal gene expressed during infection.
View Article and Find Full Text PDFAn Bras Dermatol
April 2024
Discipline of Dermatology, Faculty of Medical Sciences, Universidade do Estado do Rio de Janeiro, Rio de Janeiro, RJ, Brazil.
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