Influence of the cultivation medium and pH on the pigmentation of Trichophyton rubrum

Blechert, Oliver; Zheng, Hailin; Zang, Xiaohui; Wang, Qiong; Liu, Weida

doi:10.1371/journal.pone.0222333

Cited by 10 publications

(4 citation statements)

References 30 publications

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“…Therefore, pigmentation may differ in culture and in situ. It is well documented that the degree of pigmentation of fungal cultures depends on the medium (Kowalski et al 2016;Palacio-Barrera et al 2019;Blechert et al 2019). In a previous study of sooty mould fungi associated with R. ferrugineum, fewer fungi were dark pigmented on a MYA medium than on other media (Flessa and Rambold 2013).…”

Section: Applied Methodsmentioning

confidence: 96%

Comparative analyses of sooty mould communities from Brazil and Central Europe

et al. 2021

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To gain an insight into fungal sooty mould communities on leaves of trees and shrubs in the tropics and in temperate regions, 47 biofilms of the Mata Atlântica rainforest relic and the Caatinga vegetation in the state of Sergipe, Northeast Brazil, and from Central European colline and alpine zones were compared. The four sampling sites clearly differed in composition of their epiphyllous fungal communities. The fungal OTUs from all sites belonged mainly to the Ascomycota, with Dothideomycetes being the dominant class. The core community group consisted of a few site-specific representatives in co-occurrence with the ubiquitous Mycosphaerella tassiana and Aureobasidium pullulans. Most species of the core community were dark pigmented and were accompanied by facultative unpigmented or lightly pigmented species. Among the cultivable fungal species, the proportion of melanised species was significantly more abundant in samples from the two European sites, which supports the theory of thermal melanism. The identity of the host plant had a stronger impact on fungal community composition than the presence of sap-feeding insects.

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Section: Applied Methodsmentioning

confidence: 96%

Comparative analyses of sooty mould communities from Brazil and Central Europe

et al. 2021

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“…Various analytical techniques, including volumetry, spectrometry, radioactive assay, immunoassays, conductimetry, chromatography, and biosensors, were used to determine virulence factors in fungi. These developing approaches can be utilized to quantify the mycotoxin activity of T. violaceum (Blechert, 2019).…”

Section: Ftir and Gc-ms Analysismentioning

confidence: 99%

Investigating <em>Trichophyton violaceum</em> Metabolites and their Effects <em>In Vivo</em>

Al-garawyi,

Safar,

Majid Mohammed Mahmood

2024

Multidiscip. Sci. J.

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The common dermatophyte Trichophyton violaceum invades hair of the endothrix type by penetrating the cortex right above the hair bulb and surrounding the shaft below the undamaged cuticle. The current investigation aims to isolate and characterize secondary metabolites of T. violaceum and detect their effects In vivo. In this study, 52 (65%) out of 80 clinical specimens were positive for Trichophyton violaceum by both KOH 10% wet mount and culture. It has appeared that T. violaceum isolates can create a variety of secondary metabolites. Of these, one compound appeared in yellow with Rf. with a value of 14.2 cm in TLC plates compared to standard AFB1, named T. violaceum A (TVA) complex. The FTIR and GC-MS chromatography showed several possibilities for analyzing such secondary metabolites, but the most acceptable possibility is that the compound (TVA) may be acidic. The macroscopic and microscopic examination of rat skin sections showed pathological changes after three weeks of subcutaneous injection with this compound. This study represents the first study about the production of mycotoxins from T. violaceum.

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“…colors brown by producing DOPA melanin through the enzymes tyrosinase and laccase [ 8 , 9 ], and Candida spp. metabolizes d-tryptophan into pigmented products [ 10 ] and produces DOPA melanin through laccase [ 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Fungal Melanonychia: A Systematic Review

Rodríguez-Cerdeira,

Martínez-Herrera,

Cortés-López

et al. 2024

Microorganisms

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Fungal melanonychia is an uncommon condition, most typically caused by opportunistic melanin-producing pigmented filamentous fungi in the nail plate. In the present study, the clinical characteristics of patients diagnosed with fungal melanonychia were analyzed through a systematic review of cases reported in the literature. The MESH terms used for the search were “melanonychia” AND “fungal” OR “fungi” through four databases: PubMed, SciELO, Google scholar and SCOPUS. After discarding inadequate articles using the exclusion criteria, 33 articles with 133 cases were analyzed, of which 44% were women, 56% were men and the age range was between 9 and 87 years. The majority of cases were reported in Turkey followed by Korea and Italy. Frequent causal agents detected were Trichophyton rubrum as non-dematiaceous in 55% and Neoscytalidium dimidiatum as dematiaceous in 8%. Predisposing factors included nail trauma, migration history, employment and/or outdoor activities. Involvement in a single nail was presented in 45% of the cases, while more than one affected nail was identified in 21%, with a range of 2 to 10 nails. Regarding the clinical classification, 41% evidenced more than one type of melanonychia, 21% corresponded to the longitudinal pattern and 13% was of total diffuse type. Likewise, the usual dermoscopic pattern was multicolor pigmentation. It is concluded that fungal melanonychia is an uncommon variant of onychomycosis and the differential diagnosis is broad, which highlights the complexity of this disease.

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Influence of the cultivation medium and pH on the pigmentation of Trichophyton rubrum

Cited by 10 publications

References 30 publications

Comparative analyses of sooty mould communities from Brazil and Central Europe

Comparative analyses of sooty mould communities from Brazil and Central Europe

Investigating <em>Trichophyton violaceum</em> Metabolites and their Effects <em>In Vivo</em>

Fungal Melanonychia: A Systematic Review

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