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Adaptive olfactory circuitry restores function despite severe olfactory bulb degeneration.

Tamar Licht1, Michael Yunerman1, Ido Maor2

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Mice with severe olfactory bulb (OB) degeneration retained normal olfaction. Aberrant OB circuitry and ectopic projections allowed piriform cortex to process odors, preserving olfactory function.

Keywords:
behaviorneural representationodorolfactory epitheliumpiriform cortexsmell

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Area of Science:

  • Neuroscience
  • Olfactory System Research
  • Mammalian Neuroanatomy

Background:

  • The olfactory bulb (OB) is a key brain region for processing smell.
  • Intact OB circuitry is traditionally considered essential for olfaction.
  • OB lesions in rodents typically cause anosmia.

Purpose of the Study:

  • To investigate olfactory circuitry and function in mice with severe OB developmental degeneration.
  • To determine if olfactory capabilities are maintained despite OB abnormalities.
  • To explore the neural basis of preserved olfaction in the absence of typical OB structure.

Main Methods:

  • Utilized a mouse model with severe developmental OB degeneration.
  • Assessed odor-guided behaviors and innate olfactory cue responses.
  • Examined olfactory sensory neuron projections and OB neuronal morphology.
  • Analyzed piriform cortex neural activity in response to odors.

Main Results:

  • Mice with near-total OB loss performed odor-guided tasks and responded to innate cues normally.
  • Piriform cortices showed odor-evoked activity, enabling odor identity decoding.
  • Sensory neurons projected ectopically to olfactory cortical regions alongside rudimentary OB targets.
  • OB principal neurons were reduced in number with abnormal dendritic morphology and lost glomerular organization.

Conclusions:

  • Olfactory functionality can be preserved despite significantly reduced and aberrant OB circuitry.
  • Ectopic projections and piriform cortex activity may underlie preserved olfaction.
  • Findings challenge the necessity of canonical OB circuitry for basic olfactory processing.
  • This may explain retained olfaction in humans with OB degeneration.