Alpha-N-acetylgalactosaminidase deficiency

Definition:

Alpha-N-acetylgalactosaminidase (NAGA) deficiency is an autosomal recessive lysosomal storage disorder caused by deficiency of alpha-N-acetylgalactosaminidase, which removes terminal alpha-GalNAc monosaccharides from glycolipids and glycoproteins (primarily O-linked). The enzymatic defect results in inappropriate accumulation of substrates in various organ systems. NAGA deficiency is divided into three types. Type 1 is Schindler disease, characterized by mental retardation, spasticity ,and myoclonus. Type 2, known as Kanzaki disease, is an adult-onset disorder characterized by angiokeratoma corporis diffusum and mild intellectual impairment. Type 3 is an intermediate disorder with mild-to-moderate neurologic manifestations.

References:

[1]. Bryce A Heese, et al. Current strategies in the management of lysosomal storage diseases. Semin Pediatr Neurol. 2008 Sep;15(3):119-26. [Content Brief]

[2]. Hitoshi Sakuraba, et al. Structural and immunocytochemical studies on alpha-N-acetylgalactosaminidase deficiency (Schindler/Kanzaki disease). J Hum Genet. 2004;49(1):1-8. [Content Brief]

[3]. J C Michalski, et al. Glycoprotein lysosomal storage disorders: alpha- and beta-mannosidosis, fucosidosis and alpha-N-acetylgalactosaminidase deficiency. Biochim Biophys Acta. 1999 Oct 8;1455(2-3):69-84. [Content Brief]

[4]. J L Keulemans, et al. Human alpha-N-acetylgalactosaminidase (alpha-NAGA) deficiency: new mutations and the paradox between genotype and phenotype. J Med Genet. 1996 Jun;33(6):458-64. [Content Brief]

[5]. Nathaniel E Clark, et al. The 1.9 a structure of human alpha-N-acetylgalactosaminidase: The molecular basis of Schindler and Kanzaki diseases. J Mol Biol. 2009 Oct 23;393(2):435-47. [Content Brief]

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