Predator-secreted sulfolipids induce defensive responses in C. elegans

Area of Science:

• Neuroethology
• Chemical Ecology
• Molecular Biology

Background:

• Animals exhibit behavioral and physiological changes in response to predators.
• The specific molecular mechanisms underlying these responses are not well understood.

Purpose of the Study:

• To investigate the signaling pathways C. elegans (a nematode) uses to detect and respond to its predator, Pristionchus pacificus.
• To identify the chemical cues and neuronal mechanisms involved in predator detection.

Main Methods:

• Behavioral assays to observe C. elegans escape and oviposition responses.
• Chemical analysis to identify predator-specific molecules.
• Genetic and electrophysiological studies to identify sensory neurons and ion channels involved in signaling.

Main Results:

• A class of sulfolipids produced by P. pacificus acts as a predator-specific molecular signature.
• These sulfolipids are detected by C. elegans amphid sensory neurons.
• Cyclic nucleotide-gated (CNG) and transient receptor potential (TRP) channels mediate escape and reduced oviposition.
• The anti-anxiety drug sertraline abolished predator-evoked responses.

Conclusions:

• C. elegans utilizes specific sulfolipids as a predator cue, detected by sensory neurons.
• The response involves conserved signaling pathways, including CNG and TRP channels.
• These findings suggest conserved or convergent strategies for managing predator threats across species.