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The perception of a salty flavor is facilitated by sodium ions within the oral salivary fluid. Upon consumption of a salty substance, salt crystals disassemble, leading to the liberation of its constituents—Na+ and Cl- ions. These ions subsequently dissolve into the salivary fluid present in the oral cavity. The external environment of the gustatory cells experiences an elevation in Na+ concentration, thereby establishing a potent concentration gradient. This gradient propels the...
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Gustation is a chemical sense that, along with olfaction (smell), contributes to our perception of taste. It starts with the activation of receptors by chemical compounds (tastants) dissolved in the saliva. The saliva and filiform papillae on the tongue distribute the tastants and increase their exposure to the taste receptors.
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Related Experiment Video

Updated: Nov 15, 2025

Assessment of Spatial Lingual Tactile Sensitivity using a Gratings Orientation Test
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Mechanism for food texture preference based on grittiness.

Qiaoran Li1, Craig Montell1

  • 1Department of Molecular, Cellular, and Developmental Biology and the Neuroscience Research Institute, University of California, Santa Barbara, Santa Barbara, CA 93106, USA.

Current Biology : CB
|March 3, 2021
PubMed
Summary

Flies can sense food texture by discriminating particle sizes, a decision influenced by the conserved TMEM63 channel. This mechanically activated channel is crucial for flies to assess food appeal based on texture.

Keywords:
Drosophila melanogasterOSCATMEM63channelfood texturegrittygustationmechanical activationparticle sizesmoothsomatosensationtaste

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Area of Science:

  • Mechanobiology
  • Neuroscience
  • Sensory Biology

Background:

  • Food acceptance relies on both chemical composition and textural properties, such as particle size influencing grittiness.
  • The role of specific mechanosensory channels in mediating texture-based food preferences in animals remains largely unexplored.

Purpose of the Study:

  • To investigate the ability of Drosophila melanogaster to discriminate food particle sizes.
  • To identify the molecular mechanisms underlying texture-based food selection in flies.
  • To explore the function of the conserved OSCA/TMEM63 mechanically activated channel in this process.

Main Methods:

  • Behavioral assays measuring food choice in Drosophila melanogaster based on particle size.
  • Genetic manipulation of the tmem63 gene in flies.
  • Electrophysiological recordings from mechanosensory neurons (md-L) in the fly tongue.

Main Results:

  • Drosophila melanogaster demonstrates a clear ability to discriminate between food particles of different sizes.
  • The tmem63 gene is expressed in multidendritic neurons (md-L) in the fly tongue.
  • Loss of tmem63 function significantly impairs the mechanical activation of md-L neurons and disrupts particle size-based food choice.

Conclusions:

  • The TMEM63 channel plays a critical role in mediating the mechanical sensation of food texture in flies.
  • This study reveals the first animal-specific function for the evolutionarily conserved TMEM63 channel.
  • Flies utilize TMEM63 to sense and behaviorally respond to food texture, impacting food selection.