Succinic semialdehyde dehydrogenase deficiency
Other Names for this Disease
- 4-hydroxybutyric aciduria
- SSADH deficiency
- GABA metabolic defect
See Disclaimer regarding information on this site. Some links on this page may take you to organizations outside of the National Institutes of Health.
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). The primary role of GABA is to prevent the brain from being overloaded with too many signals. A shortage (deficiency) of succinic semialdehyde dehydrogenase leads to an increase in the amount of GABA and a related molecule called gamma-hydroxybutyrate (GHB) in the body, particularly the brain and spinal cord (central nervous system). It is unclear how an increase in GABA and GHB causes developmental delay, seizures, and other signs and symptoms of succinic semialdehyde dehydrogenase deficiency.
Last updated: 9/25/2013
- Succinic semialdehyde dehydrogenase deficiency. Genetics Home Reference. June 2008; http://ghr.nlm.nih.gov/condition/succinic-semialdehyde-dehydrogenase-deficiency. Accessed 9/25/2013.