DMD and Duchenne muscular dystrophy: The frequency of mutations in the dystrophin gene in our DMD population was as follows: 35 patients (50%) had a mutation in the central region, 9 (12.86%) a deletion in the amino terminal region, 11 (15.71%) had other mutations (6 had deletions in the hot spot regions, 3 had a point mutation, and 2 had a duplication); fifteen patients (21.43%) had no identified mutations.