Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Spinocerebellar ataxia 2 ?
    ### Response:
    Spinocerebellar ataxia 2 (SCA2) is a progressive disorder that causes symptoms including uncoordinated movement (ataxia), speech and swallowing difficulties, muscle wasting, slow eye movement, and sometimes dementia. Signs and symptoms usually begin in mid-adulthood but can appear any time from childhood to late-adulthood.
    