Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes MECP2 duplication syndrome ?
    ### Response:
    What causes MECP2 duplication syndrome? MECP2 duplication syndrome occurs when there is an extra copy (duplication) of the MECP2 gene in each cell. This is generally caused by a duplication of genetic material located on the long (q) arm of the X chromosome.
    