Neurexin 2 (NRXN2)

Neurexins are a family of proteins that function in the vertebrate nervous system as cell adhesion molecules and receptors. They are encoded by several unlinked genes of which two, NRXN1 and NRXN3, are among the largest known human genes.  NRXN2 gene contains 23 exons, has very large introns, and spans 106 kb, making it a relatively small gene compared to NRXN1 and NRXN3. Exon 1 is more than 2 kb and encodes the first LNS domain and the first EGF-like repeat of alpha-neurexins. Other exons are average in size, with the remaining LNS domains interrupted by at least 1 intron, whereas all EGF-like repeats are encoded in single exons. The last exon, also relatively large, encodes the transmembrane region and cytoplasmic tail.