Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Jackson-Weiss syndrome ?
    ### Response:
    Jackson-Weiss syndrome is a genetic disorder characterized by foot abnormalities and the premature fusion of certain skull bones (craniosynostosis). This early fusion prevents the skull from growing normally and affects the shape of the head and face.  Many of the characteristic facial features of Jackson-Weiss syndrome result from premature fusion of the skull bones.
    