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Updated: May 21, 2026

Volatile Sex Pheromone Extraction and Chemoattraction Assay in Caenorhabditis elegans
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Published on: August 9, 2024

Interspecific nematode signals regulate dispersal behavior.

Fatma Kaplan1, Hans T Alborn, Stephan H von Reuss

  • 1Center for Medical, Agricultural and Veterinary Entomology, Agricultural Research Service, United States Department of Agriculture (USDA-ARS), Gainesville, Florida, United States of America. fkaplan@ufl.edu

Plos One
|June 16, 2012
PubMed
Summary
This summary is machine-generated.

Ascarosides, chemical signals, regulate nematode dispersal. These compounds from Caenorhabditis elegans also disperse plant parasitic and entomopathogenic nematodes, suggesting conserved communication systems for pest control.

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Published on: January 28, 2016

Area of Science:

  • Nematology
  • Chemical Ecology
  • Behavioral Biology

Background:

  • Dispersal is a critical nematode behavior, often mediated by specialized larvae like dauer in *Caenorhabditis elegans*.
  • Dauer larvae are analogous to infective juveniles (IJ) of entomopathogenic nematodes (EPN) and second-stage juveniles (J2) of plant-parasitic nematodes.
  • The regulation of nematode dispersal behavior remains largely uninvestigated.

Purpose of the Study:

  • To investigate the role of ascarosides in regulating dispersal behavior in *Caenorhabditis elegans*.
  • To determine if ascarosides influence the dispersal of other nematode species, including EPNs and plant-parasitic nematodes.

Main Methods:

  • Liquid chromatography-mass spectrometry (LC-MS) analysis of *C. elegans* dauer-conditioned media.
  • Bioassays using synthetic ascaroside blends to test dispersal activity on *C. elegans* dauer, *S. feltiae* IJs, and *Meloidogyne* spp. J2s.
  • Assay-guided fractionation and structural analysis of active dispersal components.

Main Results:

  • Four known ascarosides (ascr#2, ascr#3, ascr#8, icas#9) were identified in *C. elegans* dauer media.
  • A synthetic blend of these ascarosides dispersed *C. elegans* dauer larvae and also induced dispersal in *S. feltiae* IJs and *Meloidogyne* spp. J2s.
  • Ascaroside analogs were identified as major active components in *S. feltiae* and *C. elegans* dispersal blends, with ascr#9 found in infected insect cadavers of various EPN species.

Conclusions:

  • Ascaroside blends function as evolutionarily conserved communication systems across diverse nematode groups.
  • These findings highlight the potential of ascarosides for developing sustainable control strategies against parasitic nematodes.