Below is an instruction from Human. Write a response.
    ### Instruction:
    Is Fatal familial insomnia inherited ?
    ### Response:
    How is fatal familial insomnia inherited? Fatal familial insomnia (FFI) is inherited in an autosomal dominant manner. This means that to be affected, a person only needs a change (mutation) in one copy of the responsible gene in each cell. In some cases, an affected person inherits the mutation from an affected parent.
    