Published August 5, 2022 | Version v1
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Host-driven subspeciation in hedgehog fungus, Trichophyton erinacei, an emerging cause of human dermatophytosis

  • 1. Charles University
  • 2. Academy of Sciences of the Czech Republic
  • 3. Ecole Nationale Vétérinaire, Agroalimentaire et de l'Alimentation*
  • 4. Ecole Nationale Vétérinaire d'Alfort*
  • 5. Autonomous University of Barcelona
  • 6. Laboratory of Medical Microbiology, Mölbis*
  • 7. Public Health Institute Ostrava
  • 8. Hospital České Budějovice*
  • 9. Chiba University
  • 10. Nihon University
  • 11. Public Health Institute in Ústí nad Labem*
  • 12. Pardubice Regional Hospital*
  • 13. Palacký University, Olomouc
  • 14. University of Turin

Description

Trichophyton erinacei is a main cause of dermatophytosis in hedgehogs and is increasingly reported from human infections worldwide. This pathogen was originally described in the European hedgehog (Erinaceus europaeus) but is also frequently found in the African four-toed hedgehog (Atelerix albiventris), a popular pet animal worldwide. Little is known about the taxonomy and population genetics of this pathogen despite its increasing importance in clinical practice. Notably, whether there are different populations or even cryptic species associated with different hosts or geographic regions is not known. To answer these questions, we collected 161 isolates, performed phylogenetic and population-genetic analyses, determined mating-type, and characterised morphology and physiology. Multigene phylogeny and microsatellite analysis supported T. erinacei as a monophyletic species, in contrast to highly incongruent single-gene phylogenies. Two main subpopulations, one specific mainly to Atelerix and second to Erinaceus hosts, were identified inside T. erinacei, and slight differences in the size of microconidia and antifungal susceptibilities were observed among them. Although the process of speciation into two lineages is ongoing in T. erinacei, there is still gene flow between these populations. Thus, we present T. erinacei as a single species, with notable intraspecies variability in genotype and phenotype. The data from wild hedgehogs indicated that sexual reproduction in T. erinacei and de novo infection of hedgehogs from soil are probably rare events and that clonal horizontal spread strongly dominates. The molecular typing approach used in this study represents a suitable tool for further epidemiological surveillance of this emerging pathogen in both animals and humans. The results of this study also highlighted the need to use a multigene phylogeny ideally in combination with other independent molecular markers to understand the species boundaries of dermatophytes.

Notes

Funding provided by: Ministerstvo Zdravotnictví Ceské Republiky
Crossref Funder Registry ID: http://dx.doi.org/10.13039/501100003243
Award Number: NU21-05-00681

Funding provided by: Univerzita Karlova v Praze
Crossref Funder Registry ID: http://dx.doi.org/10.13039/100007397
Award Number: 204069

Funding provided by: Akademie Věd České Republiky
Crossref Funder Registry ID: http://dx.doi.org/10.13039/501100004240
Award Number: 61388971

Funding provided by: Japan Society for the Promotion of Science
Crossref Funder Registry ID: http://dx.doi.org/10.13039/501100001691
Award Number: 20F20772

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Additional details

Related works

Is cited by
10.3767/persoonia.2022.48.06 (DOI)
Is source of
10.5281/zenodo.5801130 (DOI)