Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the genetic changes related to Snyder-Robinson syndrome ?
    ### Response:
    Snyder-Robinson syndrome results from mutations in the SMS gene. This gene provides instructions for making an enzyme called spermine synthase. This enzyme is involved in the production of spermine, which is a type of small molecule called a polyamine. Polyamines have many critical functions within cells.
    