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Sporulation environment drives phenotypic variation in the pathogen Aspergillus fumigatus

S Earl Kang1, Brandi N Celia1, Douda Bensasson2

  • 1Fungal Biology Group & Plant Biology Department, University of Georgia, Athens, GA 30602, USA.

G3 (Bethesda, Md.)
|December 1, 2021
PubMed

Insights

Genetically identical Aspergillus fumigatus spores show varied germination and virulence. Spore production environment influences spore size, germination patterns, and host infection outcomes.

Area of Science:

  • Medical Mycology
  • Microbial Pathogenesis
  • Environmental Microbiology

Background:

  • Aspergillus fumigatus causes over 300,000 life-threatening infections annually.
  • This fungus is widespread, producing numerous wind-dispersed conidia (dormant spores).
  • Inhaled conidia can germinate in susceptible hosts, leading to disease.

Purpose of the Study:

  • To investigate how environmental conditions during spore production affect Aspergillus fumigatus conidia.
  • To analyze germination phenotypes and virulence of genetically identical conidia.
  • To understand the impact of environmental factors on fungal spore heterogeneity.

Main Methods:

  • High-throughput single-cell analysis using flow cytometry.
  • Analysis of conidia produced and germinated under nine distinct environmental conditions.
  • Assessment of virulence using a Galleria mellonella host model.

Main Results:

  • Genetically identical Aspergillus fumigatus conidia exhibit variable germination phenotypes.
  • The environment where spores are produced dictates their size and germination heterogeneity.
  • Spore production environment significantly impacts fungal virulence in a host model.

Conclusions:

  • Environmental conditions during spore production are critical determinants of Aspergillus fumigatus conidial traits.
  • Spore production environment influences germination variability and subsequent host-pathogen interactions.
  • Understanding these environmental impacts is key to managing Aspergillus fumigatus infections.
Keywords:
conidiaflow cytometryheterogenetitysporulation

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