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Whole Mount Immunolabeling of Olfactory Receptor Neurons in the Drosophila Antenna
Published on: May 4, 2014
Excitatory interactions between olfactory processing channels in the Drosophila antennal lobe
Shawn R Olsen1, Vikas Bhandawat, Rachel I Wilson
1Department of Neurobiology, Harvard Medical School, 220 Longwood Avenue, Boston, MA 02115, USA.
Neuron
|April 6, 2007
Summary
In Drosophila, olfactory information integration starts early in projection neurons (PNs). A dense network of lateral connections distributes odor-evoked excitation between channels in the first brain region.
Area of Science:
- Neuroscience
- Olfactory System Research
- Insect Olfaction
Background:
- Each odorant receptor gene corresponds to a unique olfactory receptor neuron (ORN) type.
- Odor perception requires integrating signals from multiple ORN types.
- Information integration is crucial for forming a unified olfactory percept.
Purpose of the Study:
- To investigate the initial site of olfactory information integration in the Drosophila brain.
- To elucidate the role of projection neurons (PNs) in processing olfactory inputs.
- To map the network of lateral connections within the olfactory processing stream.
Main Methods:
- Genetic silencing of specific olfactory receptor neurons (ORNs) in Drosophila.
- Experimental manipulation to confine odor-evoked input to single glomeruli.
- Analysis of lateral excitatory input to projection neurons (PNs) from other glomeruli.
Main Results:
- Projection neurons (PNs) postsynaptic to silenced glomeruli receive significant lateral excitatory input.
- Most PNs receive indirect excitatory input from active ORN types via lateral connections.
- The pattern of lateral connections between glomeruli is stereotyped across individuals.
Conclusions:
- Olfactory information integration begins at the level of second-order projection neurons (PNs) in Drosophila.
- A dense network of lateral connections facilitates the distribution of odor-evoked excitation between olfactory channels.
- This network is a fundamental feature of the initial olfactory processing stream.
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