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Molecular phylogeny and phenotypic variability of clinical and environmental strains of Aspergillus flavus

Sarah S Gonçalves1, Josep F Cano, Alberto M Stchigel

  • 1Department of Medicine, Division of Infectious Diseases, Federal University of São Paulo, Brazil.

Fungal Biology
|November 17, 2012
PubMed

Insights

Aspergillus flavus, a cause of aspergillosis and aflatoxins, shows genetic diversity. Molecular analysis revealed three clades, indicating intraspecific variation rather than distinct species, with no clear separation between clinical and environmental isolates.

Area of Science:

  • Mycology
  • Medical Microbiology
  • Molecular Biology

Background:

  • Aspergillus flavus is a significant opportunistic pathogen causing aspergillosis in immunocompromised individuals.
  • This fungus is also known for producing harmful aflatoxins.
  • Limited understanding exists regarding the population structure and genetic diversity within Aspergillus flavus.

Purpose of the Study:

  • To investigate the population structure of Aspergillus flavus using morphological, physiological, and molecular analyses.
  • To determine if observed variability represents species divergence or intraspecific diversity.
  • To ascertain if clinical isolates of Aspergillus flavus constitute a distinct group.

Main Methods:

  • Morphological and physiological characterization of clinical and environmental Aspergillus flavus isolates.
  • Phylogenetic analysis using amdS and omtA genes.
  • Comparative analysis of genetic clades, morphology, and physiology.

Main Results:

  • Phylogenetic analysis of amdS and omtA genes identified three main clades within Aspergillus flavus.
  • No clear distinction was observed between clinical and environmental isolates across these clades.
  • Minimal morphological and physiological differences were noted between clades, except for d-glucosamine assimilation, which distinguished clade II.

Conclusions:

  • The genetic variability in Aspergillus flavus primarily represents intraspecific diversity, not species divergence.
  • Clinical and environmental isolates do not form separate, distinct groups within the analyzed population structure.
  • D-glucosamine assimilation is a potential physiological marker for differentiating specific clades within Aspergillus flavus.

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