Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Early-onset, autosomal dominant Alzheimer disease ?
    ### Response:
    Early-onset, autosomal dominant Alzheimer disease is a form of Alzheimer disease (AD) that develops before the age of 65. In general, AD is a degenerative disease of the brain that causes gradual loss of memory, judgement, and the ability to function socially.
    