N-glycanase 1 deficiency is a congenital disorder of deglycosylation, which has been diagnosed in 27 patients, including 2 of them from Poland. The most characteristic symptoms include global developmental disability, hyperkinetic movement disorder, hypo-/alacrimia, and elevated serum transaminases. We reported on a patient in whom the liver biopsy done at the age of 3 years revealed the presence of steatosis, fibrosis, and an amorphous periodic acid-Schiff staining positive diastases-digested material in the cytoplasm.
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Van Keulen BJ, Rotteveel J, Finken MJJ. Unexplained death in patients with NGLY1 mutations may be explained by adrenal insufficiency. Physiol Rep 2019; 7: e13979.
Haijes HA, De Sain-van der Velden MGM, Prinsen HCMT, et al. Aspartylglycosamine is a biomarker for NGLY1-CDDG, a congenital disorderof deglycosylation. Mol Genet Metab 2019; 127: 368-372.
Chang CA, Wei X, Martin SR, et al. Transiently elevated plasma methionine, S-adenosylmethionine and S-adenosylhomocysteine: Unreported laboratory findings in a patient with NGLY1 deficiency, a congenital disorder of deglycosylation. JIMD Rep 2019; 49: 21-29.
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