HESX1: A novel gene implicated in a familial form of septo-optic dysplasia

M. T. Dattani, J. P. Martinez-Barbera, P. Q. Thomas, J. M. Brickman, R. Gupta, J. K.H. Wales, P. C. Hindmarsh, R. S.P. Beddington, I. C.A.F. Robinson

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

The homeobox gene Hesx1, which encodes a pituitary transcription factor, is first expressed at gastrulation in the mouse embryo. Hesx1 expression begins in prospective forebrain tissue but later becomes restricted to Rathke's pouch, the primordium of the anterior pituitary gland. Transgenic mice lacking Hesx1 exhibit a phenotype comprising variable anterior CNS defects, such as a reduced prosencephalon, abnormalities in the corpus callosum and septum pellucidum, anophthalmia or microphthalmia, defective olfactory development and bifurcations in Rathke's pouch with pituitary dysplasia. A comparable and highly variable phenotype in humans is septo- optic dysplasia. We have cloned and sequenced the human homologue HESX1 and screened for mutations in affected individuals using single-stranded conformational polymorphism analysis. Two siblings with septo-optic dysplasia were homozygous for a missense mutation within the HESX1 homeobox. This mutation resulted in the substitution of a highly conserved arginine residue (Arg53) by cysteine and led to a loss of in vitro DNA binding. Hence, a vital role for Hesx1/HESX1 in forebrain and pituitary development in mice and humans is suggested.

Original languageEnglish
Pages (from-to)49-54
Number of pages6
JournalActa Paediatrica, International Journal of Paediatrics, Supplement
Volume88
Issue number433
Publication statusPublished or Issued - 1 Dec 1999
Externally publishedYes

Keywords

  • HESX1 gene
  • Homeobox
  • Homeodomain
  • Missense mutation
  • Pituitary
  • Rathke's pouch
  • Septo-optic dysplasia

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health

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