Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the genetic changes related to Bietti crystalline dystrophy ?
    ### Response:
    Bietti crystalline dystrophy is caused by mutations in the CYP4V2 gene. This gene provides instructions for making a member of the cytochrome P450 family of enzymes. These enzymes are involved in the formation and breakdown of various molecules and chemicals within cells.
    