Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Potocki-Lupski syndrome ?
    ### Response:
    Potocki-Lupski syndrome (PTLS) is a genetic disorder characterized by the presence of an extra copy of a tiny portion of chromosome 17 (duplication of 17p11.2). People with this duplication often have low muscle tone, poor feeding, and failure to thrive during infancy.
    