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Related Concept Videos

Gustation01:43

Gustation

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.
Taste Buds and Receptors01:20

Taste Buds and Receptors

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,...
The Physiology of Taste01:24

The Physiology of Taste

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 diffusion of...
Incomplete Dominance01:43

Incomplete Dominance

Gregor Mendel's work (1822 - 1884) was primarily focused on pea plants. Through his initial experiments, he determined that every gene in a diploid cell has two variants called alleles inherited from each parent. He suggested that amongst these two alleles, one allele is dominant in character and the other recessive. The combination of alleles determines the phenotype of a gene in an organism.
Glucose Transporters01:27

Glucose Transporters

Glucose transporters facilitate the transport of glucose across the cell membrane. In addition to glucose, some glucose transporters can also aid the movement of other hexoses such as fructose, mannose, and galactose.
Facilitated diffusion-glucose transporters (GLUTs) are encoded by the solute-linked carrier (SLC) family 2, subfamily A gene family, or SLC2A. The 14 GLUT protein members are distributed into three classes:
G-Protein Gated Ion Channels01:21

G-Protein Gated Ion Channels

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.
Sensory organs,...

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Related Experiment Video

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Base Recording: A Technique for Analyzing Responses of Taste Neurons in Drosophila
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Base Recording: A Technique for Analyzing Responses of Taste Neurons in Drosophila

Published on: March 1, 2024

Gustation genetics: sweet gustducin!

Danielle R Reed1, Robert F Margolskee

  • 1Monell Chemical Senses Center, Philadelphia, PA 19104, USA. reed@monell.org

Chemical Senses
|July 28, 2010
PubMed
Summary
This summary is machine-generated.

Genetic variations in the sweet taste receptor (TAS1R3) and gustducin (GNAT3) influence how individuals perceive sugar concentrations. This impacts the human sweet tooth, potentially contributing to obesity and diabetes.

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Last Updated: Jun 10, 2026

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Published on: March 1, 2024

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Published on: March 7, 2025

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Published on: February 11, 2021

Area of Science:

  • Genetics
  • Human Physiology
  • Taste Perception

Background:

  • The perception of sweetness is crucial for dietary choices.
  • Genetic factors are increasingly recognized as influencing individual differences in taste perception.

Purpose of the Study:

  • To investigate the role of genetic variation in TAS1R3 and GNAT3 genes in human sucrose taste perception.
  • To explore the link between these genetic variations and the human "sweet tooth".

Main Methods:

  • Analysis of genetic variation in TAS1R3 and GNAT3.
  • Assessment of participants' ability to discriminate between different sucrose concentrations.

Main Results:

  • Evidence suggests that genetic variations in TAS1R3 and GNAT3 significantly affect the ability to discern varying sucrose concentrations.
  • These genetic differences correlate with individual differences in sweet taste perception.

Conclusions:

  • Genetic variation in TAS1R3 and GNAT3 plays a role in shaping the human sweet taste preference.
  • Understanding these genetic links may offer insights into the development of obesity and diabetes.