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Official Full Name: serine palmitoyltransferase long chain base subunit 1<br />Also known as: HSN1; LBC1; LCB1; SPT1; SPTI; ALS27; HSAN1<br />This gene encodes a member of the class II pyridoxal phosphate-dependent transaminase family. The encoded protein is long-chain base subunit 1 of serine palmitoyltransferase. Serine palmitoyltransferase converts L-serine and palmitoyl-CoA with pyridoxal 5'-phosphate to 3-oxysphingosine and is a key enzyme in sphingolipid biosynthesis. Mutations in this gene have been found in patients with hereditary sensory neuropathy type 1. Alternative splice variants encoding different isoforms have been identified. Pseudogenes of this gene have been identified on chromosomes 1, 6, 10 and 13.