Galpha14 in Sweet Taste Cells of the Tongue
Author Information
Author(s): Tizzano Marco, Dvoryanchikov Gennady, Barrows Jennell K, Kim Soochong, Chaudhari Nirupa, Finger Thomas E
Primary Institution: Rocky Mountain Taste & Smell Center, University of Colorado Denver School of Medicine
Hypothesis
Which Gα subunit couples to the sweet taste receptor in taste cells?
Conclusion
Gα14 is co-expressed with the sweet taste receptor in the posterior tongue, indicating different mechanisms for sweet taste transduction in different tongue regions.
Supporting Evidence
- Gα14 is expressed strongly in vallate and foliate taste buds but not in fungiform taste buds.
- Gα14 mRNA is limited to Type II taste cells in taste buds.
- Immunocytochemistry shows Gα14 correlates with sweet receptor expression.
- Single-cell gene expression profiling confirms Gα14 is present in sweet-responsive cells.
Takeaway
This study found that a specific protein called Gα14 is important for tasting sweetness in the back of the tongue, while a different protein is used in the front.
Methodology
The study used RT-PCR, immunocytochemistry, and single-cell gene expression profiling to analyze taste cells.
Limitations
The study primarily focused on mouse models, which may not fully represent human taste mechanisms.
Participant Demographics
Adult transgenic mice were used in the study.
Digital Object Identifier (DOI)
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