Defects in ASS1 are the cause of citrullinemia type 1 (CTLN1). Citrullinemia belongs to the urea cycle disorders. It is an autosomal recessive disease characterized primarily by elevated serum and urine citrulline levels. Ammonia intoxication is another manifestation. CTLN1 usually manifests in the first few days of life. Affected infants appear normal at birth, but as ammonia builds up in the body they present symptoms such as lethargy, poor feeding, vomiting, seizures and loss of consciousness. Less commonly, a milder CTLN1 form can develop later in childhood or adulthood. Belongs to the argininosuccinate synthase family. Type 1 subfamily. Note: This description may include information from UniProtKB.
Protein type: Amino Acid Metabolism - alanine, aspartate and glutamate; Ligase; Mitochondrial; Endoplasmic reticulum; Amino Acid Metabolism - arginine and proline; EC 18.104.22.168
SS: The number of records in which this modification site was determined using site-specific methods. SS methods include amino acid sequencing, site-directed mutagenesis, modification site-specific antibodies, specific MS strategies, etc.