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1 Department of Life Science, Tokyo University of Pharmacy and Life Science, Hachioji, Tokyo, Japan; Monell Chemical Senses Center, Philadelphia, Pennsylvania, United States
2 Biological Sciences, Barnard College, Columbia University, New York, New York, United States
3 Monell Chemical Senses Center, Philadelphia, Pennsylvania, United States
4 Monell Chemical Senses Center, Philadelphia, Pennsylvania, United States; Department of Psychology and School of Veterinary Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States
* To whom correspondence should be addressed. E-mail: bachmanov{at}monell.org.
The Tas1r3 gene encodes the T1R3 receptor protein, which is involved in sweet taste transduction. To characterize ligand specificity of the T1R3 receptor and the genetic architecture of sweet taste responsiveness, we analyzed taste responses of 129.B6-Tas1r3 congenic mice to a variety of chemically diverse sweeteners and glucose polymers using three different measures: consumption in 48-hr two-bottle preference tests, initial licking responses, and responses of the chorda tympani nerve. The results were generally consistent across the three measures. Allelic variation of the Tas1r3 gene influenced taste responsiveness to non-nutritive sweeteners (saccharin, acesulfame-K, sucralose, SC-45647), sugars (sucrose, maltose, glucose, fructose), sugar alcohols (erythritol, sorbitol) and some amino acids (D-tryptophan, D-phenylalanine and L-proline). Tas1r3 genotype did not affect taste responses to several sweet-tasting amino acids (L-glutamine, L-threonine, L-alanine and glycine), glucose polymers (Polycose, maltooligosaccharide), and non-sweet NaCl, HCl, quinine, monosodium glutamate and inosine 5'-monophosphate. Thus, Tas1r3 polymorphisms affect taste responses to many nutritive and non-nutritive sweeteners (all of which must interact with a taste receptor involving T1R3), but not to all carbohydrates and amino acids. In addition, we found that the genetic architecture of sweet taste responsiveness changes depending on the measure of taste response and intensity of the sweet taste stimulus. Variation in the T1R3 receptor influenced peripheral taste responsiveness over a wide range of sweetener concentrations, but behavioral responses to higher concentrations of some sweeteners increasingly depended on mechanisms that could override input from the peripheral taste system.
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