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New whole-organism assays using Caenorhabditis elegans offer a faster, more accurate method for discovering drugs to combat antimicrobial resistance. These in vivo screens reduce false positives and streamline target identification for novel therapeutics.

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Area of Science:

  • Microbiology
  • Genetics
  • Drug Discovery

Background:

  • Traditional drug discovery methods face challenges in identifying new compounds against antimicrobial resistance.
  • Whole-organism, in vivo assays offer a promising alternative to traditional in vitro screening.
  • Caenorhabditis elegans and Danio rerio are effective hosts for high-throughput phenotypic screening.

Purpose of the Study:

  • To demonstrate the utility of a whole-organism assay for interrogating host variation in a C. elegans-Pseudomonas aeruginosa pathosystem.
  • To showcase extensions of the assay, including high-throughput genetic screens using RNA interference (RNAi).
  • To report a modified assay using Enterococcus faecalis for improved safety and efficiency.

Main Methods:

  • Utilized a liquid killing assay with C. elegans and P. aeruginosa.
  • Implemented high-throughput genetic screens via RNAi in 24- and 96-well plate formats.
  • Developed a variation of the assay using E. faecalis, eliminating the need for preinfection.

Main Results:

  • The assay effectively interrogated host variation in the C. elegans-P. aeruginosa pathosystem.
  • Whole genome screens were completed in months, simplifying drug target identification.
  • The E. faecalis assay demonstrated robustness with ~95% death rates 96 hours post-infection and an improved safety profile.

Conclusions:

  • Whole-organism in vivo assays provide a powerful platform for drug discovery and target identification, particularly for antimicrobial resistance.
  • RNAi-based genetic screens in C. elegans accelerate the discovery of host factors involved in pathogen interactions.
  • The developed E. faecalis assay offers a safer and more efficient alternative for studying gram-positive bacterial infections in vivo.