Conserved regulatory elements establish the dynamic expression of Rpx/HesxI in early vertebrate development

Shen Ju Chou, Edit Hermesz, Toshihisa Hatta, Doug Feltner, Heithem M. El-Hodiri, Milan Jamrich, Kathleen Mahon

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

TheRpx/Hesx1 homeobox gene is expressed during gastrulation in the anterior visceral and definitive endoderm and the cephalic neural plate. At later stages of development, its expression is restricted to Rathke's pouch, the primordium of the pituitary gland. This expression pattern suggests the presence of at least two distinct regulatory regions that control early and late Rpx transcription. Using transgenic mice, we have demonstrated that regulatory sequences in the 5′ upstream region of Rpx are important for early expression in the anterior endoderm and neural plate and regulatory elements in the 3′ region are required for late expression in Rathke's pouch. We have found that the genetically required LIM homeodomain-containing proteins Lim1/Lhx1 and Lhx3 are directly involved in the regulation of Rpx transcription. They bind two LIM protein-binding sites in the 5′ upstream region of Rpx, which are required for Rpx promoter activity in both mice and Xenopus. Furthermore, we have found that a conserved enhancer in the 3′ regulatory sequences of Rpx is not only required, but is also sufficient for the expression of Rpx transgenes in the developing Rathke's pouch.

Original languageEnglish
Pages (from-to)533-545
Number of pages13
JournalDevelopmental Biology
Volume292
Issue number2
DOIs
Publication statusPublished - Apr 15 2006

Keywords

  • Anterior visceral endoderm
  • Homeobox
  • LIM-HD proteins
  • Lhx3
  • Neural plate
  • Pitx2
  • Rathke's pouch
  • Rpx/Hesx1

ASJC Scopus subject areas

  • Molecular Biology
  • Developmental Biology
  • Cell Biology

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