What is STT3A-CDG?

STT3A-CDG is a form of congenital disorders of N-linked glycosylation characterized by developmental delay, intellectual disability, failure to thrive, hypotonia and seizures. STT3A-CDG is caused by mutations in the gene STT3A (11q23.3).

Other condition names

  • CDG syndrome type Iw
  • CDG-Iw
  • CDG1W
  • Congenital disorder of glycosylation type 1w
  • Congenital disorder of glycosylation type Iw

Inheritance type

Autosomal recessive


  • Worldwide: <1 in 1,000 000

Age of Onset

  • Infancy
  • Neonatal
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