Neuroligin-4, X-linked is a protein that in humans is encoded by the NLGN4X gene.

This gene encodes a member of a family of neuronal cell surface proteins. Members of this family may act as splice site-specific ligands for beta-neurexins and may be involved in the formation and remodeling of central nervous system synapses. The encoded protein interacts with discs, large (Drosophila) homolog 4 (DLG4). Mutations in this gene have been associated with autism and Asperger syndrome. Two transcript variants encoding the same protein have been identified for this gene. [provided by RefSeq, Jul 2008].
Function: Putative neuronal cell surface protein involved in cell-cell-interactions.