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Updated: Jul 11, 2026
08:09
Gene-environment Interaction Models to Unmask Susceptibility Mechanisms in Parkinson's Disease
Published on: January 7, 2014
Phenylthiocarbamide (PTC) perception in Parkinson disease
Paul J Moberg1, Catherine C Balderston, Jacqueline H Rick
1Parkinson's Disease Research, Education, and Clinical Center, Philadelphia Veterans Affairs Medical Center, University of Pennsylvania School of Medicine, Philadelphia, PA 19104, USA. moberg@bbl.med.upenn.edu
Summary
Phenylthiocarbamide (PTC) nontaster status is more frequent in Parkinson disease (PD) patients. This genetic trait may indicate a potential risk factor for developing PD.
Area of Science:
- Neuroscience
- Genetics
- Gastroenterology
Background:
- Phenylthiocarbamide (PTC) taste perception is linked to G protein-signaling pathways.
- These pathways are also implicated in dopamine regulation, a key factor in Parkinson disease (PD).
- Previous research has not explored PTC tasting abilities in PD patients.
Purpose of the Study:
- To investigate phenylthiocarbamide (PTC) sensitivity in Parkinson disease (PD) patients.
- To determine if PTC taster status could serve as a vulnerability marker for PD.
Main Methods:
- Assessed PTC sensitivity using a standardized psychophysical method.
- Included 36 male PD patients and 20 healthy male comparison subjects.
Main Results:
- A higher proportion of nontasters was observed in PD patients compared to healthy controls.
- This difference was not attributable to age or basic taste perception.
- PTC taster status did not correlate with PD duration, age of onset, or symptom severity.
Conclusions:
- The frequency of PTC nontaster status is elevated in individuals with PD.
- Given the genetic basis of PTC sensitivity, this finding suggests a potential surrogate risk factor for PD development.
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