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. 1991 Aug;88(2):707–711. doi: 10.1172/JCI115357

Lysosomal alpha-N-acetylgalactosaminidase deficiency, the enzymatic defect in angiokeratoma corporis diffusum with glycopeptiduria.

T Kanzaki 1, A M Wang 1, R J Desnick 1
PMCID: PMC295421  PMID: 1907616

Abstract

Recently a novel case of angiokeratoma corporis diffusum with glycoaminoaciduria was described in a 46-yr-old Japanese woman. Known causes of the cutaneous manifestation were eliminated by enzyme analyses, and further characterization of the accumulated urinary O-linked sialopeptides revealed identity to those excreted by patients with an infantile neuroaxonal dystrophy due to lysosomal alpha-N-acetylgalactosaminidase deficiency. Investigation of the alpha-N-acetylgalactosaminidase activity and protein in the proband revealed less than 2% of normal activity and the absence of detectable immunoreactive enzyme protein, findings comparable to those in the patients with infantile neuroaxonal dystrophy and alpha-N-acetylgalactosaminidase deficiency. In addition, the proband's unaffected offspring had half-normal levels of alpha-N-acetylgalactosaminidase activity, consistent with this enzymatic deficiency being the primary metabolic defect in this autosomal recessive trait. Ultrastructural examination of skin and blood cells from the adult proband revealed the presence of prominent lysosomal inclusions containing diffuse amorphous and filamentous material. In contrast, these morphologic findings were not observed in the nonneural tissues from patients with infantile neuroaxonal dystrophy and alpha-N-acetylgalactosaminidase deficiency. These studies document the occurrence of two forms of alpha-N-acetylgalactosaminidase deficiency and sialopeptiduria, a severe infantile-onset form of neuroaxonal dystrophy without angiokeratoma or visceral lysosomal inclusions and an adult-onset form characterized by angiokeratoma, extensive lysosomal accumulation of sialoglycopeptides and the absence of detectable neurologic involvement.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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