Involved in regulation of neurotransmitter receptor localization to postsynaptic specialization membrane and regulation of presynapse assembly. Is active in glutamatergic synapse. Is anchored component of presynaptic membrane. Human ortholog(s) of this gene implicated in Keipert syndrome. Orthologous to human GPC4 (glypican 4). [provided by Alliance of Genome Resources, Apr 2022]