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N\u2010glycosylation has a key role in functionality, stability, and half\u2010life of most proteins. Therefore, congenital defects of glycosylation typically are multisystem disorders. Here we report a 3\u2010year\u2010old patient with severe neurological, cardiovascular, respiratory, musculoskeletal and gastrointestinal symptoms. ALG1\u2010CDG was suggested based on exome sequencing and Western blot analysis. Despite her severe clinical manifestations and genetic diagnosis, serum transferrin glycoform analysis was normal. Western blot analysis of highly glycosylated proteins in fibroblasts revealed decreased intercellular adhesion molecule 1 (ICAM1), but normal lysosomal associated membrane protein 1 and 2 (LAMP1 and LAMP2) expression levels. Glycoproteomics in fibroblasts showed the presence of the abnormal tetrasacharide. Reviewing the literature, we found 86 reported ALG1\u2010CDG patients, but only one with normal transferrin analysis. Based on our results we would like to highlight the importance of multiple approaches in diagnosing ALG1\u2010CDG, as normal serum transferrin glycosylation or other biomarkers with normal expression levels can occur.<\/jats:p>","DOI":"10.1002\/jmd2.12415","type":"journal-article","created":{"date-parts":[[2024,4,17]],"date-time":"2024-04-17T02:48:55Z","timestamp":1713322135000},"page":"135-143","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Normal transferrin glycosylation does not rule out severe <scp>ALG1<\/scp> deficiency"],"prefix":"10.1002","volume":"65","author":[{"given":"Inez","family":"Bosnyak","sequence":"first","affiliation":[{"name":"Department of Clinical Genomics Mayo Clinic  Rochester Minnesota USA"},{"name":"Department of Anatomy University of P\u00e9cs, Medical School  P\u00e9cs 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