Carbohydrate-deficient glycoprotein syndrome type II. An autosomal recessive N-acetylglucosaminyltransferase II deficiency different from typical hereditary erythroblastic multinuclearity, with a positive acidified-serum lysis test (HEMPAS)

Eur J Biochem. 1995 Jun 1;230(2):797-805. doi: 10.1111/j.1432-1033.1995.0797h.x.


Carbohydrate-deficient glycoprotein syndromes (CDGS) are a family of multisystemic congenital diseases resulting in underglycosylated glycoproteins, suggesting defective N-glycan assembly. Fibroblast extracts from two patients with a recently described variant of this disease (CDGS type II) have previously been shown to have over 98% reduced activity of UDP-GlcNAc:alpha-6-D-mannoside beta-1,2-N-acetylglucosaminyltransferase II [GlcNAc-TII; Jaeken, J., Schachter, H., Carchon, H., De Cock, P., Coddeville, B. & Spik, G. (1994) Arch. Dis. Childhood 71, 123-127]. We show in this paper that mononuclear cell extracts from one of these CDGS type-II patients have no detectable GlcNAc-TII activity and that similar extracts from 12 blood relatives of the patient, including his father, mother and brother, have GlcNAc-TII levels 32-67% that of normal levels (average 50.1% +/- 10.7% SD), consistent with an autosomal recessive disease. The poly(N-acetyllactosamine) content of erythrocyte membrane glycoproteins bands 3 and 4.5 of this CDGS patient were estimated, by tomato lectin blotting, to be reduced by 50% relative to samples obtained from blood relatives and normal controls. Similar to patients with hereditary erythroblastic multinuclearity with a positive acidified-serum lysis test (HEMPAS), erythrocyte membrane glycoproteins in the CDGS patient have increased reactivities with concanavalin A, demonstrating the presence of hybrid or oligomannose carbohydrate structures. However, bands 3 and 4.5 in HEMPAS erythrocytes have almost complete lack of poly(N-acetyllactosamine). Furthermore, CDGS type-II patients have a totally different clinical presentation and their erythrocytes do not show the serology typical of HEMPAS, suggesting that the genetic lesions responsible for these two diseases are possibly different.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adult
  • Aged
  • Anemia, Dyserythropoietic, Congenital / diagnosis*
  • Carbohydrate Sequence
  • Child
  • Child, Preschool
  • Diagnosis, Differential
  • Erythrocyte Membrane / metabolism
  • Female
  • Genes, Recessive
  • Humans
  • Lectins / metabolism
  • Leukocytes, Mononuclear / enzymology
  • Leukocytes, Mononuclear / metabolism
  • Male
  • Mannosidases / metabolism
  • Membrane Glycoproteins / metabolism
  • Metabolism, Inborn Errors / diagnosis*
  • Metabolism, Inborn Errors / genetics
  • Middle Aged
  • Molecular Sequence Data
  • N-Acetylglucosaminyltransferases / deficiency*
  • Pedigree
  • Syndrome


  • Lectins
  • Membrane Glycoproteins
  • N-Acetylglucosaminyltransferases
  • beta-1,3-galactosyl-0-glycosyl-glycoprotein beta-1,3-N-acetylglucosaminyltransferase
  • Mannosidases