Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) deoxyguanosine kinase deficiency ?
    ### Response:
    Deoxyguanosine kinase deficiency is an inherited disorder that can cause liver disease and neurological problems. Researchers have described two forms of this disorder. The majority of affected individuals have the more severe form, which is called hepatocerebral because of the serious problems it causes in the liver and brain.
    