The protein encoded by this gene belongs to the glutamine synthetase family. It catalyzes the synthesis of glutamine from glutamate and ammonia in an ATP-dependent reaction. This protein plays a role in ammonia and glutamate detoxification , acid-base homeostasis , cell signaling , and cell proliferation. Glutamine is an abundant amino acid , and is important to the biosynthesis of several amino acids , pyrimidines , and purines. Mutations in this gene are associated with congenital glutamine deficiency , and overexpression of this gene was observed in some primary liver cancer samples. There are six pseudogenes of this gene found on chromosomes 2 , 5 , 9 , 11 , and 12. Alternative splicing results in multiple transcript variants. [provided by RefSeq , Dec 2014] ,
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