Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) deafness-dystonia-optic neuronopathy syndrome ?
    ### Response:
    Deafness-dystonia-optic neuronopathy (DDON) syndrome, also known as Mohr-Tranebjrg syndrome, is characterized by hearing loss that begins early in life, problems with movement, impaired vision, and behavior problems. This condition occurs almost exclusively in males.
    