Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Pol III-related leukodystrophy ?
    ### Response:
    Pol III-related leukodystrophy is a disorder that affects the nervous system and other parts of the body. Leukodystrophies are conditions that involve abnormalities of the nervous system's white matter, which consists of nerve fibers covered by a fatty substance called myelin.
    