Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the genetic changes related to small fiber neuropathy ?
    ### Response:
    Mutations in the SCN9A or SCN10A gene can cause small fiber neuropathy. These genes provide instructions for making pieces (the alpha subunits) of sodium channels. The SCN9A gene instructs the production of the alpha subunit for the NaV1.7 sodium channel and the SCN10A gene instructs the production of the alpha subunit for the NaV1.
    