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Taste perception: how to make a gourmet mouse.
Hiroaki Matsunami1, Hubert Amrein
1Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA.
Current Biology : CB
|February 28, 2004
Summary
Taste perception of sugars and amino acids relies on specific taste cells. These cells exclusively use three G protein-coupled receptors (T1R1, T1R2, T1R3) to detect sweet tastes and amino acids.
Area of Science:
- Molecular Biology
- Neuroscience
- Sensory Science
Background:
- Taste perception is crucial for food selection and involves the detection of various tastants.
- Sugars and amino acids are known to elicit desirable taste sensations, contributing to palatability.
Purpose of the Study:
- To investigate the specific molecular mechanisms underlying the detection of sugars, artificial sweeteners, and L-amino acids.
- To identify the G protein-coupled receptors (GPCRs) responsible for mediating these taste sensations.
Main Methods:
- Utilized knockout mouse models to study taste perception.
- Examined the expression patterns of taste receptor genes in taste cells.
- Assessed the functional responses to various sugars, artificial sweeteners, and L-amino acids.
Main Results:
- Demonstrated that taste cells expressing T1R1, T1R2, and T1R3 receptors are exclusively responsible for detecting sugars, artificial sweeteners, and L-amino acids.
- Showed that these receptors function either individually or in pair-wise combinations to mediate taste detection.
- Confirmed the exclusive role of these three GPCRs in sweet and amino acid taste pathways.
Conclusions:
- The T1R family of G protein-coupled receptors (T1R1, T1R2, T1R3) are essential and exclusively mediate the detection of sugars, artificial sweeteners, and L-amino acids.
- Understanding these receptor mechanisms provides insight into the neurobiology of taste and flavor perception.