Congenital hyperammonemia, type I
Type of disease: Rare conditions
Carbamoyl phosphate synthetase I deficiency is type of urea cycle disorder. It causes toxic levels of ammonia to accumulate in the blood. Signs and symptoms in newborns 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 individuals have a less severe form of the deficiency, and have milder symptoms that may not appear until later in life. Carbamoyl phosphate synthetase I deficiency is caused by mutations in the CPS1 gene and is inherited in an autosomal recessive fashion. Source: Genetic and Rare Diseases Information Center (GARD), supported by ORDR-NCATS and NHGRI.