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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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Gustation, or the sense of taste, is intrinsically linked to the anatomical structures located on the tongue. This organ's surface, along with the entirety of the oral cavity, is adorned with stratified squamous epithelium. Evident on the tongue are elevated structures known as papillae (singular = papilla), which house the mechanisms for the transduction of gustatory stimuli. Four distinct types of papillae exist, each identified by their unique morphological attributes: the circumvallate,...
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GPCRs are primarily responsible for our sense of smell, taste, and vision.  The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
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The surface of the tongue is covered with various small bumps called papillae, which either distribute what has been ingested (filiform papillae) or contain the sensory taste (or gustatory) receptor cells (fungiform, circumvallate, and foliate papillae). Embedded within each taste-related papilla are the taste buds—clusters of 30 to 100 gustatory receptor cells.
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G Protein-Coupled Receptors or GPCRs are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to sensory stimuli such as light, odors, hormones, cytokines, or neurotransmitters.
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Receptor Polymorphism and Genomic Structure Interact to Shape Bitter Taste Perception.

Natacha Roudnitzky1, Maik Behrens1, Anika Engel1

  • 1German Institute of Human Nutrition Potsdam-Rehbruecke, Department of Molecular Genetics, Nuthetal, Germany.

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|September 26, 2015
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Summary
This summary is machine-generated.

Genetic variations in bitter taste receptors (TAS2R) influence how individuals perceive bitterness. Complex gene interactions and linkage patterns, not just single genes, explain these taste differences.

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Area of Science:

  • Genetics
  • Sensory Science
  • Molecular Biology

Background:

  • Bitter taste perception evolved as a defense against toxins.
  • Individual differences in bitter taste sensitivity are genetically influenced by TAS2R gene polymorphisms.
  • Single TAS2R gene associations are uncommon due to receptor specificity overlaps.

Purpose of the Study:

  • To investigate complex genotype-phenotype associations for bitter taste perception across the TAS2R gene family.
  • To analyze taste responses to six diverse bitter compounds in a Caucasian population.
  • To decipher the molecular basis of bitter taste variation influenced by TAS2R gene family genetics.

Main Methods:

  • Sequencing of all bitter taste receptor (TAS2R) loci.
  • Inference of long-range haplotypes.
  • Phenotypic variation mapping and characterization of functionally causal allelic variants.
  • Analysis of taste responses to six structurally diverse bitter compounds.

Main Results:

  • Identified functional polymorphic alleles within haplotype blocks affecting phenotypic variation for compounds like amarogentin and grosheimin.
  • Revealed complex associations between TAS2R loci, where linkage phase of alleles significantly impacts bitterness sensitivity.
  • Demonstrated that linked sensitive alleles enhance genotype-phenotype correlations, while opposing phases weaken them.

Conclusions:

  • Genetic influences on taste perception are complex, involving interactions across multiple TAS2R loci.
  • Both receptor activation patterns and the linkage structure among TAS2R genes shape variations in bitter taste.
  • Understanding these complex genetic architectures is crucial for explaining individual differences in bitter perception.