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Related Experiment Video

Updated: Dec 8, 2025

Aversive Associative Learning and Memory Formation by Pairing Two Chemicals in Caenorhabditis elegans
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C. elegans aversive olfactory learning generates diverse intergenerational effects.

Ana Goncalves Pereira1, Xicotencatl Gracida1, Konstantinos Kagias1

  • 1Department of Organismic and Evolutionary Biology, Center for Brain Science, Harvard University, Cambridge, MA, USA.

Journal of Neurogenetics
|September 17, 2020
PubMed
Summary
This summary is machine-generated.

Parental experience with a pathogen influences offspring behavior. Short exposure increases attraction, while longer exposure causes avoidance, mediated by small RNA pathways.

Keywords:
C. elegansIntergenerationepigeneticslearningolfaction

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Area of Science:

  • Behavioral genetics
  • Epigenetics
  • Nematology

Background:

  • Parental experience can shape progeny behavior through inherited information.
  • Mechanisms of parental effects on behavior are known, but the impact of the *nature* of parental experience is less understood.
  • C. elegans, a nematode, learns to avoid pathogenic bacteria.

Purpose of the Study:

  • To investigate how the duration of parental experience with a pathogen affects offspring behavior.
  • To elucidate the molecular mechanisms underlying these intergenerational behavioral effects.

Main Methods:

  • Utilized C. elegans as a model organism.
  • Manipulated the duration of parental exposure to a pathogenic bacterium.
  • Analyzed offspring behavioral responses (attraction/avoidance).
  • Investigated the role of RNA-dependent RNA Polymerase (RdRP) RRF-3 and 26G endo-siRNAs.

Main Results:

  • Unexpectedly, short parental exposure to the pathogen increased progeny preference for it.
  • Extended parental exposure duration reversed the progeny's response, leading to avoidance.
  • The RNA-dependent RNA Polymerase (RdRP) RRF-3, crucial for 26G endo-siRNA biogenesis, mediated both attraction and avoidance responses.
  • Demonstrated that distinct parental experiences with the same stimulus elicit divergent offspring behaviors.

Conclusions:

  • The nature and duration of parental experience critically influence offspring behavior.
  • Small RNA-mediated gene regulation, involving RRF-3 and 26G endo-siRNAs, underlies these intergenerational behavioral plasticity.
  • Parental experience acts as a key modulator of adaptive behavioral responses in progeny.