This occurrence, which is well‐described for example in TOR1A‐related dystonia (DYT‐TOR1A; OMIM# 128100),13, 14, 15SGCE‐related myoclonus‐dystonia (OMIM# 159900),16, 17, 18 and many repeat expansion disorders,19 poses a challenge in defining the inheritance pattern, especially in small pedigrees. This evidence concerns the gene TOR1A and Myoclonus.