CSGALNACT1-congenital disorder of glycosylation: A mild skeletal dysplasia with advanced bone age

Shuji Mizumoto, Andreas R. Janecke, Azita Sadeghpour, Gundula Povysil, Marie T. McDonald, Sheila Unger, Susanne Greber-Platzer, Kristen L. Deak, Nicholas Katsanis, Andrea Superti-Furga, Kazuyuki Sugahara, Erica E. Davis, Shuhei Yamada, Julia Vodopiutz*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Congenital disorders of glycosylation (CDGs) comprise a large number of inherited metabolic defects that affect the biosynthesis and attachment of glycans. CDGs manifest as a broad spectrum of disease, most often including neurodevelopmental and skeletal abnormalities and skin laxity. Two patients with biallelic CSGALNACT1 variants and a mild skeletal dysplasia have been described previously. We investigated two unrelated patients presenting with short stature with advanced bone age, facial dysmorphism, and mild language delay, in whom trio-exome sequencing identified novel biallelic CSGALNACT1 variants: compound heterozygosity for c.1294G>T (p.Asp432Tyr) and the deletion of exon 4 that includes the start codon in one patient, and homozygosity for c.791A>G (p.Asn264Ser) in the other patient. CSGALNACT1 encodes CSGalNAcT-1, a key enzyme in the biosynthesis of sulfated glycosaminoglycans chondroitin and dermatan sulfate. Biochemical studies demonstrated significantly reduced CSGalNAcT-1 activity of the novel missense variants, as reported previously for the p.Pro384Arg variant. Altered levels of chondroitin, dermatan, and heparan sulfate moieties were observed in patients’ fibroblasts compared to controls. Our data indicate that biallelic loss-of-function mutations in CSGALNACT1 disturb glycosaminoglycan synthesis and cause a mild skeletal dysplasia with advanced bone age, CSGALNACT1-CDG.

Original languageEnglish (US)
Pages (from-to)655-667
Number of pages13
JournalHuman mutation
Volume41
Issue number3
DOIs
StatePublished - Mar 1 2020

Keywords

  • CSGALNACT1-CDG
  • CSGalNAcT-1
  • advanced bone age
  • cartilage and brain development
  • glycosaminoglycan
  • joint laxity
  • macrocephaly
  • proteoglycan
  • short stature

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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    Mizumoto, S., Janecke, A. R., Sadeghpour, A., Povysil, G., McDonald, M. T., Unger, S., Greber-Platzer, S., Deak, K. L., Katsanis, N., Superti-Furga, A., Sugahara, K., Davis, E. E., Yamada, S., & Vodopiutz, J. (2020). CSGALNACT1-congenital disorder of glycosylation: A mild skeletal dysplasia with advanced bone age. Human mutation, 41(3), 655-667. https://doi.org/10.1002/humu.23952