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Discovery of a sexual stage in Trichophyton onychocola, a presumed geophilic dermatophyte isolated from toenails of patients with a history of T. rubrum onychomycosis.

https://arctichealth.org/en/permalink/ahliterature274856
Source
Med Mycol. 2015 Nov;53(8):798-809
Publication Type
Article
Date
Nov-2015
Author
Vit Hubka
Christoffer V Nissen
Rasmus Hare Jensen
Maiken C Arendrup
Adela Cmokova
Alena Kubatova
Magdalena Skorepova
Miroslav Kolarik
Source
Med Mycol. 2015 Nov;53(8):798-809
Date
Nov-2015
Language
English
Publication Type
Article
Keywords
Cell Division
Crossing Over, Genetic
Culture Media - chemistry
DNA, Fungal - chemistry - genetics
Denmark
Genes, Mating Type, Fungal
Humans
Male
Microscopy
Middle Aged
Molecular Sequence Data
Nails - microbiology - pathology
Onychomycosis - diagnosis - microbiology
Sequence Analysis, DNA
Trichophyton - genetics - isolation & purification - physiology
Abstract
Trichophyton onychocola is a recently described geophilic dermatophyte that has been isolated from a toenail of Czech patient with a history of onychomycosis due to T. rubrum and clinical suspicion of relapse. In this study, we report a similar case from Denmark in an otherwise healthy 56-year-old man. The patient had a history of great toenail infection caused by T. rubrum in 2004 and presented with suspected relapse in 2011 and 2013. Trichophyton onychocola was the only microbial agent isolated at the second visit in 2013 and the identification was confirmed by DNA sequencing. Direct microscopic nail examination was positive for hyphae, however the etiological significance of T. onychocola was not supported by repeated isolation of the fungus. This new species may be an overlooked geophilic species due to the resemblance to some common species, for example, zoophilic T. interdigitale or some species of geophilic dermatophytes. We included differential diagnosis with phenotypically similar species; however, it is recommended that molecular methods are used for correct identification. The MAT locus of Danish strain was of opposite mating type than in the previously isolated Czech strain and the two isolates were successfully mated. The mating experiments with related heterothallic species T. thuringiense and Arthroderma melis were negative. The sexual state showed all typical signs of arthroderma-morph and is described by using optical as well as scanning electron microscopy. The sexual state was induced on a set of agar media, however low cultivation temperature and the presence of keratin source were crucial for the success rather than formulation of medium.
PubMed ID
26129891 View in PubMed
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White-nose syndrome without borders: Pseudogymnoascus destructans infection tolerated in Europe and Palearctic Asia but not in North America.

https://arctichealth.org/en/permalink/ahliterature278366
Source
Sci Rep. 2016 Jan 29;6:19829
Publication Type
Article
Date
Jan-29-2016
Author
Jan Zukal
Hana Bandouchova
Jiri Brichta
Adela Cmokova
Kamil S Jaron
Miroslav Kolarik
Veronika Kovacova
Alena Kubátová
Alena Nováková
Oleg Orlov
Jiri Pikula
Primož Presetnik
Jurgis Šuba
Alexandra Zahradníková
Natália Martínková
Source
Sci Rep. 2016 Jan 29;6:19829
Date
Jan-29-2016
Language
English
Publication Type
Article
Keywords
Animals
Arctic Regions
Ascomycota - pathogenicity
Chiroptera - microbiology
Europe
Haplotypes
Hibernation
Host-Pathogen Interactions
Humans
Mycoses - epidemiology - microbiology - pathology
North America
Nose - microbiology - pathology
Russia
Skin - microbiology - pathology
Abstract
A striking feature of white-nose syndrome, a fungal infection of hibernating bats, is the difference in infection outcome between North America and Europe. Here we show high WNS prevalence both in Europe and on the West Siberian Plain in Asia. Palearctic bat communities tolerate similar fungal loads of Pseudogymnoascus destructans infection as their Nearctic counterparts and histopathology indicates equal focal skin tissue invasiveness pathognomonic for WNS lesions. Fungal load positively correlates with disease intensity and it reaches highest values at intermediate latitudes. Prevalence and fungal load dynamics in Palearctic bats remained persistent and high between 2012 and 2014. Dominant haplotypes of five genes are widespread in North America, Europe and Asia, expanding the source region of white-nose syndrome to non-European hibernacula. Our data provides evidence for both endemicity and tolerance to this persistent virulent fungus in the Palearctic, suggesting that host-pathogen interaction equilibrium has been established.
Notes
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PubMed ID
26821755 View in PubMed
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