It refers to a group of genetic diseases characterized by progressive weakness and degeneration of the skeletal or voluntary muscles which control movement Most of the people affected are males who aged from 3 to 20 Inherited Gene mutation Muscle weakness Decrease in muscle strength and corrdinatino Eyelid drooping Mental retardation Abnormal ECG findings * Only patients who cannot perform three or more activities of daily living without assistance are included     There are no curing method for the disorder