Colonic Tissue Biopsy Detection of Phosphorylated Alpha-synuclein for Parkinson's Diagnosis or REM Sleep Behavior Disorder

What is this study about? This study is testing whether doctors can detect signs of Parkinson's disease or REM Sleep Behavior Disorder (RBD) by taking small tissue samples from the colon during a routine colonoscopy. Researchers want to see if they can find a specific protein called alpha-synuclein that builds up in people with Parkinson's disease or RBD. Why is this study important? Currently, Parkinson's disease is diagnosed mainly by observing symptoms like tremors and movement problems and RBD is characterized by the loss of muscle atonia during REM sleep. However, by the time these symptoms appear, the disease has already progressed significantly. Finding a way to detect the disease earlier could help doctors start treatment sooner and potentially slow down the disease. Who can participate? Adults between 40-99 years old People who have already been diagnosed with Parkinson's disease or REM Sleep Behavior Disorder People who are already scheduled to have a routine colonoscopy for colon cancer screening or other medical reasons What happens during the study? \*\*During the colonoscopy:\*\* The colonoscopy procedure remains exactly the same as planned. Doctors will take 4 additional small tissue samples (2 from each side of the colon). This adds only about 2 minutes to the procedure. \*\*After the colonoscopy:\*\* No additional visits are required. The tissue samples will be tested for the alpha-synuclein protein. Participants will not receive individual test results. What are the risks? The main risks are the same as any routine colonoscopy, including: Discomfort during the procedure. Very rare complications like bleeding or bowel perforation. Small risk of infection. Possible breach of medical privacy (researchers take steps to protect this). What are the benefits? Participants help advance research that could lead to earlier detection of Parkinson's disease or REM Sleep Behavior Disorder. This could eventually help future patients get diagnosed and treated sooner. There are no direct medical benefits to participants. How many people will be in this study? 20 people with Parkinson's disease and 20 people with REM Sleep Behavior Disorder will participate in this study at Digestive Disease Associates (DDA). How long does participation take? The colonoscopy procedure (same length as normally planned). This research is sponsored by CND Life Sciences and conducted at DDA.