Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the genetic changes related to deafness-dystonia-optic neuronopathy syndrome ?
    ### Response:
    Mutations in the TIMM8A gene cause DDON syndrome. The protein produced from this gene is found inside the energy-producing centers of cells (mitochondria). The TIMM8A protein forms a complex (a group of proteins that work together) with a very similar protein called TIMM13.
    