Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Townes-Brocks syndrome ?
    ### Response:
    What causes Townes-Brocks syndrome? Townes-Brocks syndrome is caused by mutations in the SALL1 gene. This gene is part of a group of genes called the SALL family. These genes provide instructions for making proteins that are involved in the formation of tissues and organs before birth.
    