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Related Experiment Videos

How smell develops.

P Mombaerts1

  • 1The Rockefeller University, 1230 York Avenue, New York, New York 10021, USA. peter@rockefeller.edu

Nature Neuroscience
|November 1, 2001
PubMed
Summary
This summary is machine-generated.

Mice use about 1000 olfactory sensory neurons to smell. Each neuron picks one odor receptor gene and connects to a specific olfactory bulb glomerulus, but other factors also influence this wiring.

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Area of Science:

  • Neuroscience
  • Olfactory system research
  • Sensory biology

Background:

  • The mammalian sense of smell relies on approximately 1000 input channels.
  • Each channel involves olfactory sensory neurons expressing a single odorant receptor gene.
  • These neurons project axons to specific targets called glomeruli in the olfactory bulb.

Purpose of the Study:

  • To investigate the mechanisms of odorant receptor gene choice.
  • To understand the process of axonal wiring in the olfactory system.
  • To clarify the determinants of glomerular targeting by olfactory sensory neurons.

Main Methods:

  • Genetic experiments were utilized to study gene choice and axonal projection.
  • Analysis of the relationship between odorant receptor expression and glomerular targeting.

Related Experiment Videos

  • Investigating the role of the expressed odorant receptor in specifying axonal choice.
  • Main Results:

    • A single neuron expresses one odorant receptor gene from a repertoire of approximately 1000.
    • Axons from neurons expressing the same receptor converge to the same glomerulus.
    • The expressed odorant receptor is a key determinant, but not the sole factor, in axonal wiring.

    Conclusions:

    • Odorant receptor gene choice and axonal wiring are fundamental to the olfactory system's organization.
    • While principles are emerging, a complete understanding of these mechanisms is still limited.
    • Further research is needed to fully elucidate the complex processes governing olfactory sensory neuron connectivity.