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Expanding the phenotypic spectrum of L1CAM-associated disease.

Basel-Vanagaite L., Straussberg R., Friez M.J., Inbar D., Korenreich L., Shohat M., Schwartz C.E.

Mutations in the L1CAM gene cause neurological abnormalities of variable severity, including congenital hydrocephalus, agenesis of the corpus callosum, spastic paraplegia, bilaterally adducted thumbs, aphasia, and mental retardation. Inter- and intrafamilial variability is a well-known feature of the L1CAM spectrum, and several patients have a combination of L1CAM mutations and Hirschsprung's disease (HSCR). We report on two siblings with a missense mutation in exon 7 (p.P240L) of the L1CAM gene. In one of the siblings, congenital dislocation of the radial heads and HSCR were present. Neither patient had hydrocephalus, adducted thumbs, or absent speech, but both had a hypoplastic corpus callosum. We suggest that L1CAM mutation testing should be considered in male patients with a positive family history compatible with X-linked inheritance and either the combination of agenesis of the CC and HSCR or the combination of agenesis of the CC and limb abnormalities, including abnormalities other than adducted thumbs.

Clin. Genet. 69:414-419(2006) [PubMed] [Europe PMC]

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