This gene encodes a member of the contactin family of immunoglobulins. Contactins are axon-associated cell adhesion;molecules that function in neuronal network formation and plasticity. The encoded protein is a;glycosylphosphatidylinositol-anchored neuronal membrane protein that may play a role in the formation of axon;connections in the developing nervous system. Deletion or mutation of this gene may play a role in 3p deletion;syndrome and autism spectrum disorders. Alternative splicing results in multiple transcript variants.