Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) autosomal recessive cerebellar ataxia type 1 ?
    ### Response:
    Autosomal recessive cerebellar ataxia type 1 (ARCA1) is a condition characterized by progressive problems with movement due to a loss (atrophy) of nerve cells in the part of the brain that coordinates movement (the cerebellum). Signs and symptoms of the disorder first appear in early to mid-adulthood.
    