Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the genetic changes related to hyperferritinemia-cataract syndrome ?
    ### Response:
    Hyperferritinemia-cataract syndrome is caused by mutations in the FTL gene. This gene provides instructions for making the ferritin light chain, which is one part (subunit) of the protein ferritin. Ferritin is made up of 24 subunits formed into a hollow spherical molecule.
    