Whole-exome-sequencing-based exploration of a further 30 German-Austrian individuals with early-onset generalized dystonia uncovered another three deleterious mutations in KMT2B-one de novo nonsense mutation (c.1633C>T [p.Arg545<sup>∗</sup>]), one de novo essential splice-site mutation (c.7050-2A>G [p.Phe2321Serfs<sup>∗</sup>93]), and one inherited nonsense mutation (c.2428C>T [p.Gln810<sup>∗</sup>]) co-segregating with dystonia in a three-generation kindred.