Cranio-lenticulo-sutural dysplasia is caused by a SEC23A mutation leading to abnormal endoplasmic-reticulum-to-Golgi trafficking

Nat Genet. 2006 Oct;38(10):1192-7. doi: 10.1038/ng1876. Epub 2006 Sep 17.


Cranio-lenticulo-sutural dysplasia (CLSD) is an autosomal recessive syndrome characterized by late-closing fontanels, sutural cataracts, facial dysmorphisms and skeletal defects mapped to chromosome 14q13-q21 (ref. 1). Here we show, using a positional cloning approach, that an F382L amino acid substitution in SEC23A segregates with this syndrome. SEC23A is an essential component of the COPII-coated vesicles that transport secretory proteins from the endoplasmic reticulum to the Golgi complex. Electron microscopy and immunofluorescence show that there is gross dilatation of the endoplasmic reticulum in fibroblasts from individuals affected with CLSD. These cells also exhibit cytoplasmic mislocalization of SEC31. Cell-free vesicle budding assays show that the F382L substitution results in loss of SEC23A function. A phenotype reminiscent of CLSD is observed in zebrafish embryos injected with sec23a-blocking morpholinos. Our observations suggest that disrupted endoplasmic reticulum export of the secretory proteins required for normal morphogenesis accounts for CLSD.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Abnormalities, Multiple / genetics*
  • Amino Acid Sequence
  • Animals
  • Cataract / genetics
  • Disease Models, Animal
  • Embryo, Nonmammalian
  • Endoplasmic Reticulum / metabolism*
  • Facial Bones / abnormalities
  • Female
  • Golgi Apparatus / metabolism*
  • Humans
  • Male
  • Molecular Sequence Data
  • Mutation*
  • Pedigree
  • Protein Transport / genetics
  • Vesicular Transport Proteins / genetics*
  • Vesicular Transport Proteins / metabolism*
  • Zebrafish / embryology
  • Zebrafish / genetics
  • Zebrafish Proteins / genetics
  • Zebrafish Proteins / metabolism


  • SEC23A protein, human
  • Vesicular Transport Proteins
  • Zebrafish Proteins