HOXA13 directly regulates EphA6 and EphA7 expression in the genital tubercle vascular endothelia

Carley A. Shaut, Chie Saneyoshi, Emily A. Morgan, Wendy M. Knosp, Diane R. Sexton, H. Scott Stadler

Research output: Contribution to journalArticle

27 Scopus citations

Abstract

Hypospadias, a common defect affecting the growth and closure of the external genitalia, is often accompanied by gross enlargements of the genital tubercle (GT) vasculature. Because Hoxa13 homozygous mutant mice also exhibit hypospadias and GT vessel expansion, we examined whether genes playing a role in angiogenesis exhibit reduced expression in the GT. From this analysis, reductions in EphA6 and EphA7 were detected. Characterization of EphA6 and EphA7 expression in the GT confirmed colocalization with HOXA13 in the GT vascular endothelia. Analysis of the EphA6 and EphA7 promoter regions revealed a series of highly conserved cis-regulatory elements bound by HOXA13 with high affinity. GT chromatin immunoprecipitation confirmed that HOXA13 binds these gene-regulatory elements in vivo. In vitro, HOXA13 activates gene expression through the EphA6 and EphA7 gene-regulatory elements. Together these findings indicate that HOXA13 directly regulates EphA6 and EphA7 in the developing GT and identifies the GT vascular endothelia as a novel site for HOXA13-dependent expression of EphAG and EphA7.

Original languageEnglish (US)
Pages (from-to)951-960
Number of pages10
JournalDevelopmental Dynamics
Volume236
Issue number4
DOIs
StatePublished - Apr 1 2007

Keywords

  • EphA6
  • EphA7
  • Genital tubercle
  • Hoxa13
  • Hypospadias
  • Vascular endothelia

ASJC Scopus subject areas

  • Developmental Biology

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