Genetic variants of the alpha-synuclein gene SNCA are associated with multiple system atrophy. oleh Ammar Al-Chalabi, Alexandra Dürr, Nicholas W Wood, Michael H Parkinson, Agnes Camuzat, Jean-Sébastien Hulot, Karen E Morrison, Alan Renton, Sigurd D Sussmuth, Bernhard G Landwehrmeyer, Albert Ludolph, Yves Agid, Alexis Brice, P Nigel Leigh, Gilbert Bensimon, NNIPPS Genetic Study Group