This gene encodes a member of the serpin superfamily of serine proteinase inhibitors. The protein is primarily secreted by axons in the brain, and preferentially reacts with and inhibits tissue-type plasminogen activator. It is thought to play a role in the regulation of axonal growth and the development of synaptic plasticity. Mutations in this gene result in familial encephalopathy with neuroserpin inclusion bodies (FENIB), which is a dominantly inherited form of familial encephalopathy and epilepsy characterized by the accumulation of mutant neuroserpin polymers. Multiple alternatively spliced variants, encoding the same protein, have been identified.SERPINI1 (Serpin Family I Member 1) is a Protein Coding gene. Diseases associated with SERPINI1 include Encephalopathy, Familial, With Neuroserpin Inclusion Bodies and Encephalopathy. Among its related pathways are Validated targets of C-MYC transcriptional activation and Cell adhesion_Plasmin signaling. GO annotations related to this gene include serine-type endopeptidase inhibitor activity. An important paralog of this gene is SERPINI2.