Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the genetic changes related to Horner syndrome ?
    ### Response:
    Although congenital Horner syndrome can be passed down in families, no associated genes have been identified. Horner syndrome that appears after the newborn period (acquired Horner syndrome) and most cases of congenital Horner syndrome result from damage to nerves called the cervical sympathetics.
    