Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) ADNP syndrome ?
    ### Response:
    ADNP syndrome, also known as Helsmoortel-van der Aa syndrome, is a complex neuro-developmental disorder that affects the brain and many other areas and functions of the body. ADNP syndrome can affect muscle tone, feeding, growth, hearing, vision, sleep, fine and gross motor skills, as well as the immune system, heart, endocrine system, and gastrointestinal tract.
    