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A new model for olfactory placode development.

Kathleen E Whitlock1

  • 1Genetics and Development, Neurobiology and Behavior, Department of Molecular Biology and Genetics, Cornell University, Ithaca, NY 14850, USA. kew13@cornell.edu

Brain, Behavior and Evolution
|September 9, 2004
PubMed
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The development of the peripheral nervous system relies on sensory placodes. Cell fate in olfactory placodes is influenced by neighboring cells during development, allowing for adaptability.

Area of Science:

  • Developmental biology
  • Neuroscience
  • Cell biology

Background:

  • The peripheral nervous system originates from cranial neural crest and sensory placodes.
  • Sensory placodes, like olfactory placodes, are crucial for forming sensory systems.
  • Placode development involves cell division and segregation from adjacent developmental fields.

Purpose of the Study:

  • To investigate the developmental origins and cell fate determination of olfactory placodes.
  • To understand the plasticity and cellular interactions during sensory placode formation.
  • To clarify the contribution of different embryonic domains to olfactory placode development.

Main Methods:

  • Analysis of developmental processes in vertebrate models (zebrafish and chick).

Related Experiment Videos

  • Tracking cell movements and segregation during placode formation.
  • Investigating cell-cell interactions and their influence on cell fate.

    • Main Results:

    • Olfactory and auditory placodes may arise from converging cell fields.
    • Cell division is evident after placodes are morphologically distinct.
    • Endocrine cells previously thought to arise from olfactory placodes originate from adjacent adenohypophyseal and cranial neural crest domains.
    • Placode domain borders are plastic, with cell sorting and neighbor-dependent fate determination.

    Conclusions:

    • Sensory placode development exhibits plasticity, allowing cells to adapt to environmental changes.
    • Cell fate within placodes is determined by neighbor interactions after cell convergence.
    • The system incorporates degeneracy, accommodating environmental shifts until cell migration is complete.