Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) MECP2 duplication syndrome ?
    ### Response:
    MECP2 duplication syndrome is a genetic condition that occurs almost exclusively in males and is characterized by moderate to severe intellectual disability. Other signs and symptoms include infantile hypotonia; delayed motor milestones (i.e. sitting up, crawling); recurrent infections; poor or absent speech; seizures; and/or spasticity.
    