Adaptation to thermotolerance in Rhizopus coincides with virulence as revealed by avian and invertebrate infection models, phylogeny, physiological and metabolic flexibility

Kerstin Kaerger, Volker U. Schwartze, Somayeh Dolatabadi, Ildikó Nyilasi, Stella A. Kovács, Ulrike Binder, Tamás Papp, Sybren de Hoog, Ilse D. Jacobsen, Kerstin Voigt

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Mucormycoses are fungal infections caused by the ancient Mucorales. They are rare, but increasingly reported. Predisposing conditions supporting and favoring mucormycoses in humans and animals include diabetic ketoacidosis, immunosuppression and haematological malignancies. However, comprehensive surveys to elucidate fungal virulence in ancient fungi are limited and so far focused on Lichtheimia and Mucor. The presented study focused on one of the most important causative agent of mucormycoses, the genus Rhizopus (Rhizopodaceae). All known clinically-relevant species are thermotolerant and are monophyletic. They are more virulent compared to non-clinically, mesophilic species. Although adaptation to elevated temperatures correlated with the virulence of the species, mesophilic strains showed also lower virulence in Galleria mellonella incubated at permissive temperatures indicating the existence of additional factors involved in the pathogenesis of clinical Rhizopus species. However, neither specific adaptation to nutritional requirements nor stress resistance correlated with virulence, supporting the idea that Mucorales are predominantly saprotrophs without a specific adaptation to warm blooded hosts.

Original languageEnglish
Pages (from-to)395-403
Number of pages9
JournalVirulence
Volume6
Issue number4
DOIs
Publication statusPublished - Jan 1 2015

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Keywords

  • Carbon source assimilation
  • Embryonated hen egg
  • Galleria mellonella
  • Growth kinetics
  • Infection model
  • Rhizopodaceae
  • Rhizopus
  • Sporodiniella
  • Syzygites
  • Thermotolerance
  • Virulence
  • Wax moth

ASJC Scopus subject areas

  • Parasitology
  • Microbiology
  • Immunology
  • Microbiology (medical)
  • Infectious Diseases

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