Mice lacking N-acetylglucosaminyltransferase I activity die at mid- gestation, revealing an essential role for complex or hybrid N-linked carbohydrates

E. Ioffe, P. Stanley

Research output: Contribution to journalArticle

334 Scopus citations


Eukaryotic cells require N-linked carbohydrates for survival. However, the biosynthetic intermediate Man5GlcNAc2Asn, in place of mature N-linked structures, allows glycoprotein synthesis and somatic cell growth to proceed normally. To determine whether the same would be true in a complex biological situation, the gene Mgat-1 was disrupted by homologous recombination in embryonic stem cells and transmitted to the germ line. The Mgat-1 gene encodes N-acetylglucosaminyltransferase I [GlcNAc-TI; α-1,3-mannosyl- glycoprotein β-1,2-N-acetylglucosaminyltransferase; UDP-N-acetyl-D- glucosamine:glycoprotein (N-acetyl-D-glucosamine to α-D-mannosyl-1,3-(R1)- β-D-mannosyl-R2) β-1,2-N-acetyl-D-glucosaminyltransferase, EC], the transferase that initiates synthesis of hybrid and complex N-linked carbohydrates from Man5GlcNAc2Asn. Mice lacking GlcNAc-TI activity did not survive to term. Biochemical and morphological analyses of embryos from 8.5 to 13.5 days of gestation showed that Mgat-1(-/-) embryos are developmentally retarded, most noticeably in neural tissue, and die between 9.5 and 10.5 days of development.

Original languageEnglish (US)
Pages (from-to)728-732
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number2
StatePublished - Jan 1 1994



  • glycobiology
  • glycosyltransferase gene
  • homologous recombination
  • mouse development

ASJC Scopus subject areas

  • General

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