Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Dentatorubral-pallidoluysian atrophy ?
    ### Response:
    Dentatorubral-pallidoluysian atrophy (DRPLA) is a progressive brain disorder that causes involuntary movements; mental and emotional problems; and a decline in thinking ability. The average age of onset of DRPLA is 30 years, but the condition can appear anytime from infancy to mid-adulthood.
    