Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) tyrosinemia ?
    ### Response:
    Tyrosinemia is a genetic disorder characterized by disruptions in the multistep process that breaks down the amino acid tyrosine, a building block of most proteins. If untreated, tyrosine and its byproducts build up in tissues and organs, which can lead to serious health problems.
    