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Axonal wiring in the mouse olfactory system.

Peter Mombaerts1

  • 1Rockefeller University, New York, New York 10021, USA. peter@rockefeller.edu

Annual Review of Cell and Developmental Biology
|October 13, 2006
PubMed
Summary

Mouse olfactory sensory neurons (OSNs) use odorant receptors (ORs) to connect to specific glomeruli in the olfactory bulb. This study explores genetic mechanisms guiding this precise axonal wiring.

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Area of Science:

  • Neuroscience
  • Genetics
  • Olfactory System Biology

Background:

  • The main olfactory epithelium in mice contains numerous olfactory sensory neuron (OSN) populations.
  • Each OSN population expresses a specific odorant receptor (OR) gene.
  • OSN axons project to precise locations within the olfactory bulb, forming structures called glomeruli.

Purpose of the Study:

  • To investigate the role of odorant receptors (ORs) in the axonal wiring of olfactory sensory neurons (OSNs).
  • To understand the genetic mechanisms underlying the specific targeting of OSN axons to glomeruli in the olfactory bulb.

Main Methods:

  • Focus on genetic approaches to study axonal projection patterns.
  • Analysis of odorant receptor gene expression and its correlation with axonal targeting.

Main Results:

  • Odorant receptors (ORs) dictate both the odorant response profile of OSNs and their axonal projection site.
  • OSNs expressing the same OR converge onto the same glomeruli, typically one glomerulus per half-bulb.
  • Glomeruli are topographically organized within the olfactory bulb based on OR expression.

Conclusions:

  • Odorant receptors (ORs) are key determinants of the precise axonal wiring in the mouse olfactory system.
  • Genetic mechanisms involving ORs guide OSN axons to their specific glomerular targets, establishing functional olfactory maps.

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