Mondo Description Homocarnosinosis is a metabolic defect characterised by progressive spastic diplegia, intellectual deficit and retinitis pigmentosa. This extremely rare disorder has been reported in only one family, namely a woman and three of her children. The latter showed progressive spastic diplegia, mental retardation and retinitis pigmentosa but their mother was symptom free. It is therefore uncertain whether there is a relationship between the biochemical defect and the clinical symptoms. Inheritance in the reported family seems to be autosomal dominant.

Disease Ontology Description A gamma-amino butyric acid metabolism disorder that is characterized by an excess of homocarnosine in the brain and has_material_basis_in a deficiency of serum carnosinase in its ability to hydrolyze homocarnosine.