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Related Experiment Videos

Olfactory processing and behavior downstream from highly selective receptor neurons.

Michelle L Schlief1, Rachel I Wilson

  • 1Department of Neurobiology, Harvard Medical School, 220 Longwood Ave., Boston, Massachusetts 02115, USA.

Nature Neuroscience
|April 10, 2007
PubMed
Summary
This summary is machine-generated.

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Some olfactory receptor neurons (ORNs) in fruit flies have narrow tuning. Ablating these ORNs affects innate attraction, showing dedicated circuits for specific odor ligands, while others contribute to broader odor representations.

Area of Science:

  • Neuroscience
  • Olfactory system research
  • Insect behavior

Background:

  • Most olfactory receptor neurons (ORNs) in vertebrates and insects respond to multiple odors.
  • A subset of ORNs exhibit narrow tuning, responding to single or few related odors.
  • It is hypothesized that narrowly tuned ORNs connect to dedicated brain circuits for innate responses.

Purpose of the Study:

  • Investigate neural activity and behavior downstream from narrowly tuned ORN types in Drosophila melanogaster.
  • Determine the projection patterns and tuning properties of central neurons postsynaptic to narrowly tuned ORNs.
  • Establish the link between specific ORN tuning and subsequent behavioral responses.

Main Methods:

  • Genetic ablation of specific narrowly tuned ORN types in Drosophila.

Related Experiment Videos

  • Analysis of neural activity in the antennal lobe.
  • Behavioral assays measuring innate attraction to specific odor ligands.

    • Main Results:

    • Genetic ablation of either studied ORN type impaired innate behavioral attraction to their specific ligand.
    • Neurons postsynaptic to one ORN type were narrowly tuned to a pheromone.
    • Neurons postsynaptic to the other ORN type were broadly tuned, participating in ensemble odor representations.

    Conclusions:

    • Some narrowly tuned ORNs project to dedicated central circuits, creating a direct link between stimulus and behavior.
    • Other narrowly tuned ORNs project to central neurons involved in broader, ensemble odor processing.
    • This highlights divergent pathways for processing specific olfactory information in the fruit fly brain.