Journal
AMERICAN JOURNAL OF MEDICAL GENETICS PART A
Volume 173, Issue 10, Pages 2772-2775Publisher
WILEY
DOI: 10.1002/ajmg.a.38377
Keywords
galactose; glycosylation; ICAM-1; normal TIEF; seizures
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ALG13-CDG has been recently discovered as a disorder of severe developmental, intellectual and speech disability, microcephaly, visual abnormalities, seizures, hepatomegaly, coagulation abnormalities, and abnormal serumtransferrin isoelectric focusing in serum. A male with seizures, delayed motor, and speech development, but normal cognition carried a hemizygous, predicted pathogenic ALG13 variant (p.E463G). N-glycosylation studies in plasma were normal. ICAM-1 expression was decreased in patient fibroblasts, supporting the variant's pathogenicity. Adding D-galactose to the patient's fibroblast culture increased ICAM-1 expression in vitro, offering a potential treatment option in ALG13-CDG. The present report is a new example for an N-glycosylation disorder, that may present with normal transferrin isoform analysis, and also demonstrates, that CDG type I patients can have normal cognitive development.
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