Complex phenotypes in ALG12-congenital disorder of glycosylation (ALG12-CDG): Case series and review of the literature

Shawn Tahata, Lauren Gunderson, Brendan Lanpher, Eva Morava

Research output: Contribution to journalReview articlepeer-review

4 Scopus citations


ALG12-congenital disorder of glycosylation (ALG12-CDG) is a rare disorder caused by a deficiency of dolichol-P-mannose:Man7GlcNAc2-PP-dolichyl-α-6-mannosyltransferase which presents with intellectual disability, hypotonia, dysmorphic features, low IgG levels with recurrent infections, male genital hypoplasia, and coagulation abnormalities. We report a unique family with three affected individuals, including two older brothers with only cognitive and coagulation defects and a younger brother who died from a severe multisystem disease at age 18 months. The two living brothers are the oldest and mildest cases of ALG12-CDG described thus far. Whole exome sequencing of the older brothers revealed a previously described c.1001delA (p.N334TfsX15) pathogenic variant and a c.671C > T (p.T224 M) variant of uncertain significance in ALG12. Our cases broaden the recognized genetic and phenotypic spectrum of this disorder and suggest a role for other genetic and environmental factors in modulating disease phenotype.

Original languageEnglish (US)
Pages (from-to)409-414
Number of pages6
JournalMolecular genetics and metabolism
Issue number4
StatePublished - Dec 2019


  • ALG12
  • ALG12-CDG
  • CDG
  • Congenital disorder of glycosylation

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Biochemistry
  • Molecular Biology
  • Genetics
  • Endocrinology


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