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J Inherit Metab Dis. 1996;19(1):76-83.

Single base deletion in exon 7 of the glycosylasparaginase gene causes a mild form of aspartylglycosaminuria in a patient of Mauritian origin.

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Department of Biochemistry and Molecular Biology, College of Medicine, University of South Alabama, Mobile 36688, USA.


Aspartylglycosaminuria (AGU) is a lysosomal storage disorder of glycoprotein degradation caused by deficiency of glycosylasparaginase (GA). A deletion mutation was found in a mildly affected AGU patient whose parents are first-cousins of Mauritian origin. One bp deletion at position 787 or 788 (delta T788) in exon 7 of the GA gene resulted in a frameshift and produced an immediate stop codon. The resulting truncated polypeptide was defective in its post-translational proteolytic processing and remained as a single chain (36 kDa) with no GA activity.

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