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A single exposure to pathogenic bacteria

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Area of Science:

  • Microbiology
  • Genetics
  • Neuroscience

Background:

  • Caenorhabditis elegans must differentiate between food and pathogens.
  • Bacterial exposure can influence worm behavior.

Purpose of the Study:

  • To investigate the role of small RNAs in pathogen avoidance learning.
  • To determine the mechanisms of transgenerational inheritance of avoidance behavior.

Main Methods:

  • Exposure of C. elegans to pathogenic Pseudomonas aeruginosa (PA14) small RNAs.
  • Assessing avoidance behavior in treated worms and subsequent generations.
  • Investigating the involvement of RNA interference (RNAi), PIWI-interacting RNA (piRNA) pathways, germline, and ASI neurons.
  • Identifying specific bacterial non-coding RNAs and their C. elegans targets.

Main Results:

  • A single exposure to PA14 small RNAs induced pathogen avoidance in C. elegans.
  • This learned avoidance was inherited across four subsequent generations.
  • The RNAi and piRNA pathways, germline, and ASI neuron were essential for both the induced avoidance and its inheritance.
  • A specific Pseudomonas aeruginosa non-coding RNA (P11) was necessary and sufficient for learned avoidance.
  • The C. elegans gene maco-1 was identified as a target required for this avoidance behavior.

Conclusions:

  • Small RNAs mediate learned pathogen avoidance in C. elegans.
  • This learned behavior and its underlying molecular mechanisms are transgenerationally inherited.
  • A non-coding RNA-dependent mechanism allows worms to sense and transmit information about microbial threats across generations.