Mutations in a Sar1 GTPase of COPII vesicles are associated with lipid absorption disorders

Nat Genet. 2003 May;34(1):29-31. doi: 10.1038/ng1145.


Dietary fat is an important source of nutrition. Here we identify eight mutations in SARA2 that are associated with three severe disorders of fat malabsorption. The Sar1 family of proteins initiates the intracellular transport of proteins in COPII (coat protein)-coated vesicles. Our data suggest that chylomicrons, which vastly exceed the size of typical COPII vesicles, are selectively recruited by the COPII machinery for transport through the secretory pathways of the cell.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • COP-Coated Vesicles / enzymology
  • Chylomicrons / metabolism
  • Dietary Fats / pharmacokinetics*
  • Female
  • GTP Phosphohydrolases / chemistry
  • GTP Phosphohydrolases / genetics*
  • Glycogen Storage Disease Type IV / enzymology
  • Glycogen Storage Disease Type IV / genetics
  • Humans
  • Intestinal Absorption
  • Malabsorption Syndromes / enzymology*
  • Malabsorption Syndromes / genetics*
  • Malabsorption Syndromes / metabolism
  • Male
  • Models, Molecular
  • Mutation*
  • Pedigree
  • Protein Conformation
  • Spinocerebellar Degenerations / enzymology
  • Spinocerebellar Degenerations / genetics


  • Chylomicrons
  • Dietary Fats
  • GTP Phosphohydrolases