Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the genetic changes related to spinocerebellar ataxia type 6 ?
    ### Response:
    Mutations in the CACNA1A gene cause SCA6. The CACNA1A gene provides instructions for making a protein that forms a part of some calcium channels. These channels transport positively charged calcium atoms (calcium ions) across cell membranes. The movement of these ions is critical for normal signaling between nerve cells (neurons) in the brain and other parts of the nervous system.
    