NCIt definition : Human OPHN1 wild-type allele is located in the vicinity of Xq12 and is approximately
392 kb in length. This allele, which encodes oligophrenin-1 protein, is involved in
the regulation of small GTPase mediated signal transduction. Mutation of the gene
is associated with X-linked mental retardation with cerebellar hypoplasia and distinctive
facial dysmorhphism.;