Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Nicolaides-Baraitser syndrome ?
    ### Response:
    What causes Nicolaides-Baraitser syndrome? Nicolaides-Baraitser syndrome (NCBRS) is caused by mutations in the SMARCA2 gene, which is located on the small arm of chromosome 9. All mutations that have been identified in affected people have been either missense mutations or in-frame deletions.
    