P2‐088: Hereditary Spastic Paraplegia and Alzheimer's Disease: Hypothesis of a Founder Effect of a SPG4/Spast Mutation. (1st July 2016) - Pedace, Lucia; Mearini, Marzia; Casella, Antonella; Montecchiani, Celeste; Miele, Marialuisa; Caltagirone, Carlo; Kawarai, Toshitaka; Orlacchio, Antonio