Defective AMN causes MGA1

Summary
Organism
Homo sapiens (human)
Reactome
R-HSA-3359462
PubChem
R-HSA-3359462
Description
  • Defects in AMN cause recessive hereditary megaloblastic anemia 1 (RH-MGA1 aka MGA1 Norwegian type or Imerslund-Grasbeck syndrome, I-GS; MIM:261100). The Norwegian cases described by Imerslund were due to defects in AMN (Imerslund 1960). The resultant malabsorption of Cbl (vitamin B12) leads to impaired B12-dependent folate metabolism and ultimately impaired thymine synthesis and DNA replication.
Click on a node on the pathway to see its details. Glycoproteins are marked with a glycoprotein icon in their name.
Displaying all 3 entries
UniProt ID Protein Name Gene Symbol Pathway Viewer
O60494 Cubilin
  • CUBN
  • IFCR
view
P27352 Cobalamin binding intrinsic factor
  • CBLIF
  • GIF
  • IFMH
view
Q9BXJ7 Protein amnionless [Cleaved into: Soluble protein amnionless]
  • AMN
  • UNQ513/PRO1028
view

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Acknowledgements

Supported by JST NBDC Grant Number JPMJND2204

Partly supported by NIH Common Fund Grant #1U01GM125267-01


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Last updated: April 6, 2026