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.
Category
Inherited metabolic disorder, Lysosomal disease
Brite
Human diseases in ICD-11 classification [BR:br08403]
05 Endocrine, nutritional or metabolic diseases
Metabolic disorders
Inborn errors of metabolism
5C56 Lysosomal diseases
H00146 Alpha-N-acetylgalactosaminidase deficiency
Keulemans JL, Reuser AJ, Kroos MA, Willemsen R, Hermans MM, van den Ouweland AM, de Jong JG, Wevers RA, Renier WO, Schindler D, Coll MJ, Chabas A, Sakuraba H, Suzuki Y, van Diggelen OP
Title
Human alpha-N-acetylgalactosaminidase (alpha-NAGA) deficiency: new mutations and the paradox between genotype and phenotype.
