Below is an instruction from Human. Write a response.
    ### Instruction:
    Is Kleefstra syndrome inherited ?
    ### Response:
    The inheritance of Kleefstra syndrome is considered to be autosomal dominant because a deletion in one copy of chromosome 9 in each cell or a mutation in one copy of the EHMT1 gene is sufficient to cause the condition. Most cases of Kleefstra syndrome are not inherited, however.
    