Groen JL1, Ritz K, Jalalzadeh H, van der Salm SM, Jongejan A, Mook OR, Haagmans MA, Zwinderman AH, Motazacker MM, et al. - February 9, 2015
BACKGROUND: Myoclonus-dystonia (M-D) is a hyperkinetic movement disorder with predominant myoclonic symptoms combined with dystonia of the upper part of the body. A proportion of M-D cases are caused by mutations in the epsilon-sarcoglycan gene. In remaining M-D patients, no genetic factor has been established, indicating genetic heterogeneity.