mSphere of Influence: Population-level thinking to unravel microbial pathogenicity

Area of Science:

• Fungal genomics
• Microbial pathogenesis
• Population genetics

Background:

• Traditional classification divides microbes into distinct pathogen or non-pathogen categories.
• This binary view may oversimplify microbial virulence and host interaction.
• Understanding the spectrum of pathogenic potential is crucial in microbiology.

Purpose of the Study:

• To challenge the binary classification of microbes as pathogens or non-pathogens.
• To explore the factors influencing microbial virulence.
• To advocate for a population-based framework in studying microbial pathogenesis.

Main Methods:

• Comparative analysis of virulence phenotypes.
• Examination of strain heterogeneity within fungal populations.
• Focus on Aspergillus species, including pathogenic and non-pathogenic isolates.

Main Results:

• Identified overlapping virulence traits between pathogenic and non-pathogenic fungal strains.
• Demonstrated that virulence is not an absolute trait but exists on a continuum.
• Highlighted the importance of strain variation in determining pathogenic potential.

Conclusions:

• Microbial pathogenicity exists on a spectrum, not as a binary characteristic.
• A population-based approach is essential for a comprehensive understanding of microbial virulence.
• Further research should investigate the genetic and environmental factors underlying this continuum.