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Rare syndrome with the association of congenital nephrotic syndrome, ocular anomalies and microcoria. The disorder results in proteinuria with nephrotic syndrome and histological lesions marked by diffuse mesangial sclerosis. Ocular anomalies are present from birth and include microcoria (small pupils that are not responsive to light) associated with absence of the pupillary dilator muscle in the iris, ciliary muscle atrophy, and abnormal eye development. Marked muscle hypotonia, movement disorders and psychomotor delay have also been reported. Mutations in the LAMB2 gene (3p21) encoding laminin beta 2 have been identified. Laminin beta 2 is expressed in the glomerular basement membrane at the neuromuscular junctions, as well as in the intraocular muscles, lens and retina. The disease is transmitted as an autosomal recessive trait.
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