Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Leukodystrophy ?
    ### Response:
    A leukodystrophy is a type of rare genetic disorder that affects the brain, spinal cord, and other nerves in the body. It is caused by destruction of the white matter of the brain. The white matter degrades due to defects of the myelin, which is a fatty covering that insulates nerves in the brain.
    