Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Norrie disease ?
    ### Response:
    What causes Norrie disease? Norrie disease is caused by a change (mutation) in the NDP gene, which is located on the X chromosome. It is inherited in an X-linked recessive manner. The NDP gene provides instructions for making a protein called norrin, which affects the way cells and tissues develop.
    