Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the genetic changes related to myotonic dystrophy ?
    ### Response:
    Myotonic dystrophy type 1 is caused by mutations in the DMPK gene, while type 2 results from mutations in the CNBP gene. The specific functions of these genes are unclear. The protein produced from the DMPK gene may play a role in communication within cells.
    