Jeffrey Kordower, PhD from Rush University Medical Center, Chicago, IL talks to us about his presentation at the 2017 Alzheimer’s Association International Conference (AAIC) held in London, UK, regarding the spread of pathology in Parkinson’s disease (PD). Here, Dr Kordower discusses the protein responsible, alpha-synuclein, and explains how it can lead to the propagation of the condition in PD patients. He also talks about the factor believed to link all degenerative diseases.