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Taste bud development in the channel catfish.

R Glenn Northcutt1

  • 1Neurobiology Unit, Scripps Institution of Oceanography, and Department of Neurosciences, School of Medicine, University of California, San Diego, La Jolla, California 92093-0201, USA. rgnorthcutt@ucsd.edu

The Journal of Comparative Neurology
|December 22, 2004
PubMed
Summary

Taste bud development in channel catfish begins early in embryonic development, with distinct patterns observed in head and trunk regions. Calretinin-positive cells mark the initial stages of taste bud formation and maturation.

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Area of Science:

  • Developmental biology
  • Neuroscience
  • Ichthyology

Background:

  • Taste bud formation is crucial for sensory perception and feeding in aquatic vertebrates.
  • Understanding the developmental timeline of taste receptors provides insights into early life stages of fish.

Purpose of the Study:

  • To characterize the spatiotemporal pattern of taste bud development in channel catfish embryos and larvae.
  • To identify key cellular markers and developmental stages involved in taste bud formation.

Main Methods:

  • Histological analysis of channel catfish embryos and larvae at various developmental stages.
  • Immunohistochemistry using calretinin as a marker for taste receptor cells.
  • Observation of taste bud primordia and mature taste bud eruption.

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Main Results:

  • Taste bud primordia, containing calretinin-positive cells, appear first in the oropharyngeal cavity and barbels by embryonic stage 39.
  • Taste bud development on the head precedes that on the trunk, with trunk taste buds forming later, coinciding with larval feeding.
  • Facial nerve fibers innervate external taste buds prior to their morphological appearance.

Conclusions:

  • Channel catfish exhibit a distinct developmental sequence for taste bud formation, with head development preceding trunk development.
  • Calretinin is a reliable marker for early taste bud development in channel catfish.
  • The timing of taste bud development is linked to feeding behaviors and sensory innervation.