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A Circuit for Gradient Climbing in C. elegans Chemotaxis.

Johannes Larsch1, Steven W Flavell1, Qiang Liu1

  • 1Howard Hughes Medical Institute, Lulu and Anthony Wang Laboratory of Neural Circuits and Behavior, The Rockefeller University, New York, NY 10065, USA.

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|September 15, 2015
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Summary

The nematode Caenorhabditis elegans navigates odor gradients using adaptable olfactory neurons (AWA) and interneurons (AIA). This circuit allows robust detection of odor changes across a vast concentration range.

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Area of Science:

  • Neuroscience
  • Animal Behavior
  • Computational Biology

Background:

  • Animals exhibit remarkable sensory tracking abilities, crucial for survival.
  • The nematode Caenorhabditis elegans (C. elegans) can locate odor sources across extreme concentration gradients.

Purpose of the Study:

  • To elucidate the neuronal properties, circuit mechanisms, and behavioral strategies enabling robust navigation in C. elegans.
  • To understand how olfactory neurons and interneurons process dynamic odor information.

Main Methods:

  • Investigated concentration and history-dependent responses in AWA olfactory neurons.
  • Analyzed the role of cilia transport in AWA desensitization.
  • Examined the amplification and desensitization properties of the downstream AIA interneuron.
  • Studied the behavioral output of the AWA-AIA circuit during odor gradient climbing.

Main Results:

  • AWA olfactory neurons exhibit concentration- and history-dependent responses, with rapid desensitization at high concentrations but maintained sensitivity to increases.
  • The AIA interneuron amplifies weak inputs and further desensitizes, producing stereotyped responses to odor increases over three orders of magnitude.
  • The AWA-AIA circuit generates asymmetric behavioral responses facilitating efficient gradient climbing.

Conclusions:

  • The adaptation-based AWA-AIA circuit motif is key to maintaining olfactory sensitivity across dynamic ranges.
  • This circuit shares computational principles with bacterial chemotaxis and vertebrate retinal processing.
  • Understanding this circuit provides insights into robust sensory navigation strategies in biological systems.