Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the genetic changes related to cone-rod dystrophy ?
    ### Response:
    Mutations in approximately 30 genes are known to cause cone-rod dystrophy. Approximately 20 of these genes are associated with the form of cone-rod dystrophy that is inherited in an autosomal recessive pattern. Mutations in the ABCA4 gene are the most common cause of autosomal recessive cone-rod dystrophy, accounting for 30 to 60 percent of cases.
    