Teasing Apart The Causes And Early Signs Of Parkinson’s - Science Friday Recap

Podcast: Science Friday

Published: 2026-01-16

Duration: 19 minutes

Guests: Dr. Emily Tamadonfar, Dr. Michael Okun

Summary

Scientists are investigating the early signs and causes of Parkinson's disease, focusing on protein misfolding, genetic factors, and environmental influences like pollution and pesticides.

What Happened

Host Flora Lichtman discusses with neurologists Dr. Emily Tamadonfar and Dr. Michael Okun about the causes and early signs of Parkinson's disease. They explain that Parkinson's is linked to the misfolding of alpha-synuclein proteins, which clump and spread in the brain, disrupting neuron function. Dr. Okun notes that while some genetic mutations can lead to Parkinson's, most cases are influenced by environmental factors like air pollution and pesticides.

The conversation highlights a significant study called the Parkinson's Progression Markers Initiative (PPMI), which aims to identify early detection methods. Dr. Tamadonfar explains that early symptoms such as hyposmia (loss of smell) and REM sleep behavior disorder can appear years before motor symptoms. These early signs are part of ongoing research to find reliable biomarkers for Parkinson's.

Dr. Okun elaborates on theories about how Parkinson's might start from the nose or gut, as protein clumps are found in both areas. He emphasizes the role of environmental toxins, such as paraquat and trichloroethylene, which are linked to a higher incidence of Parkinson's.

The discussion also touches on the lack of treatments to slow the progression of Parkinson's. Dr. Tamadonfar notes that while there's no cure, lifestyle interventions like exercise and diet can be beneficial. She expresses optimism about ongoing research efforts and the potential for early detection to aid in the development of treatments.

Dr. Okun supports the idea of preventive measures and environmental regulation, suggesting that removing harmful chemicals could reduce Parkinson's cases. Both guests agree on the importance of public awareness and storytelling in advancing research and prevention.

The episode concludes with a call to action for individuals to contribute to research by sharing their stories and participating in studies. The experts express hope for future breakthroughs in understanding and managing Parkinson's disease.

Key Insights

• Parkinson's disease is linked to the misfolding and clumping of alpha-synuclein proteins in the brain, which disrupts neuron function.
• Early symptoms of Parkinson's, such as hyposmia (loss of smell) and REM sleep behavior disorder, can appear years before motor symptoms, offering potential for early detection.
• Environmental toxins like paraquat and trichloroethylene are associated with a higher incidence of Parkinson's, suggesting environmental factors play a significant role in most cases.
• While there is no cure for Parkinson's, lifestyle interventions such as exercise and diet may provide benefits, and ongoing research aims to develop early detection methods and treatments.