Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the genetic changes related to congenital stromal corneal dystrophy ?
    ### Response:
    Congenital stromal corneal dystrophy is caused by mutations in the DCN gene. This gene provides instructions for making a protein called decorin, which is involved in the organization of collagens. Collagens are proteins that strengthen and support connective tissues such as skin, bone, tendons, and ligaments.
    