The PathoChip, a functional gene array for assessing pathogenic properties of diverse microbial communities

Area of Science:

• Environmental microbiology
• Pathogen detection
• Functional genomics

Background:

• Pathogens in the environment threaten human, plant, and animal health.
• Understanding pathogen population dynamics and pathogenic potential is crucial.
• Existing methods may lack the specificity or scope to assess virulence genes across diverse environments.

Purpose of the Study:

• To develop and validate a functional gene array, the PathoChip, for assessing pathogenic potential.
• To identify key virulence genes and their distribution in various environmental samples.
• To investigate the response of virulence genes to environmental perturbations.

Main Methods:

• Development of the PathoChip array using 3715 probes targeting 13 key virulence factors.
• Computational verification of probe specificity, achieving species-level discrimination for ~98% of probes.
• Application of the PathoChip to analyze microbial communities from soil, seawater, and human saliva.

Main Results:

• The PathoChip demonstrated high specificity and discrimination power for detecting virulence genes.
• Analysis of environmental samples revealed an increase in both abundance and diversity of virulence genes under stressed conditions.
• Microbial communities harboring virulence genes showed responsiveness to environmental perturbations, influencing gene distribution.

Conclusions:

• The PathoChip is a valuable tool for identifying virulence genes and assessing pathogenic potential in microbial communities.
• Environmental perturbations can alter the abundance and distribution of virulence genes.
• The study highlights the dynamic nature of pathogenic potential in environmental microbial populations.