Below is an instruction from Human. Write a response.
    ### Instruction:
    What causes Succinic semialdehyde dehydrogenase deficiency ?
    ### Response:
    What causes succinic semialdehyde dehydrogenase deficiency? Succinic semialdehyde dehydrogenase deficiency (SSADH) is caused by mutations in the ALDH5A1 gene. This gene provides instructions for producing the succinic semialdehyde dehydrogenase enzyme which is involved in the breakdown of a chemical that transmits signals in the brain (neurotransmitter) called gamma-amino butyric acid (GABA).
    