MPS IV - Morquio syndrome A (R-HSA-2206290) [Homo sapiens]


Mucopolysaccharidosis IV A (MPS IVA, MPS4A, Morquio's syndrome, Morquio's; MIM:253000) is a rare, autosomal recessive mucopolysaccharide storage disease, first described simultaneously in 1929 by L Morquio (Morquio L, Sur une forme de distrophie familiale, Bull Soc Pediat, Paris, 27, 1929, 145-152) and JF Brailsford (Brailsford, JF, Chondro-osteo-dystrophy: roentgenographic and clinical features of child with dislocation of vertebrae, Am j Surg, 7, 1929, 404-410). MPSIVA is caused by a deficiency in N-acetylgalactosamine 6-sulfatase (GALNS; MIM:612222) which normally hydrolyses 6-sulfate groups of N-acetylgalactosamine 6-sulfate units of chondroitin sulfate (CS) and of galactose 6-sulfate units of keratan sulfate (KS) (Matalon et al. 1974). The result is accumulation of KS/DS in cells and overexcretion in urine. Severe osteochondrodysplasia is a commonly seen phenotype for this disease. The severity of the disease is variable but severe cases limits lifespan to their 20's or 30's (Prat et al. 2008, Tomatsu et al. 2011). The gene coding for human GALNS was mapped to chromosome 16q24.3 (Masuno et al. 1993) and its structure described at the same time by two independent groups as comprising 14 exons and spanning approximately 40-50 kb (Nakashima et al.1994, Morris et al.1994).

Locations in the PathwayBrowser
Name Identifier Synonyms
mucopolysaccharidosis IV 12804 [mucopolysaccharidosis type IVA, Osteochondrodystrophy, deficiency of N-acetylgalactosamine-6-sulphatase, chondroosteodystrophy, Osteochondrodystrophy, Morquio syndrome A, MORQUIO A DISEASE, Mucopolysaccharidosis, MPS-IV-A (disorder), Mucopolysaccharidosis, MPS-IV, deficiency of chondroitinsulphatase, GALACTOSAMINE-6-SULFATASE DEFICIENCY]
Literature References
pubMedId Title Journal Year
18456538 Morquio syndrome: diagnosis in an adult Joint Bone Spine 2008
4218100 Morquio's syndrome: deficiency of a chondroitin sulfate N-acetylhexosamine sulfate sulfatase Biochem Biophys Res Commun 1974
21506915 Mucopolysaccharidosis type IVA (Morquio A disease): clinical review and current treatment Curr Pharm Biotechnol 2011
8325655 Mucopolysaccharidosis IV A: assignment of the human N-acetylgalactosamine-6-sulfate sulfatase (GALNS) gene to chromosome 16q24 Genomics 1993
8020961 Mucopolysaccharidosis IV A: molecular cloning of the human N-acetylgalactosamine-6-sulfatase gene (GALNS) and analysis of the 5'-flanking region Genomics 1994
8001980 Morquio A syndrome: cloning, sequence, and structure of the human N-acetylgalactosamine 6-sulfatase (GALNS) gene Genomics 1994