This information is provided by the National Institutes of Health (NIH) Genetic and Rare Diseases Information Center (GARD).
N-acetylglutamate synthase deficiency (NAGS) is type of metabolic disorder that affects the processing of proteins and removal of ammonia from the body. When proteins are processed by the body, ammonia is formed. Individuals with NAGS are not able to remove ammonia from the body and have symptoms due to toxic levels of ammonia that build up in the blood. NAGS and other similar disorders are a type of metabolic condition known as a urea cycle disorder.
Signs and symptoms in newborns with NAGS may include a lack of energy, unwillingness to eat, seizures, unusual body movements, and poorly controlled breathing or body temperature. Complications may include coma, developmental delay, and learning disability. Some people have a less severe form of the deficiency with earliest symptoms manifesting later in life, particularly following high-protein meals, illness, or other stress. Signs and symptoms may include sudden vomiting, lack of coordination, confusion, and coma. NAGS is caused by mutations in the NAGS gene and is inherited in an autosomal recessive fashion. Treatment may include maintaining a low protein diet and using medications that provide alternative routes to remove ammonia from the body.
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