Dynamic patterning at the pylorus: Formation of an epithelial intestine-stomach boundary in late fetal life

Xing Li, Aaron M. Udager, Chunbo Hu, Xiaotan T. Qiao, Neil Richards, Deborah L. Gumucio

Research output: Contribution to journalArticle

28 Scopus citations

Abstract

In the adult mouse, distinct morphological and transcriptional differences separate stomach from intestinal epithelium. Remarkably, the epithelial boundary between these two organs is literally one cell thick. This discrete junction is established suddenly and precisely at embryonic day (E) 16.5, by sharpening a previously diffuse intermediate zone. In the present study, we define the dynamic transcriptome of stomach, pylorus, and intestinal tissues between E14.5 and E16.5. We show that establishment of this boundary is concomitant with the induction of over a thousand genes in intestinal epithelium, and these gene products provide intestinal character. Hence, we call this process intestinalization. We identify specific transcription factors (Hnf4γ, Creb3l3, and Tcfec) and examine signaling pathways (Hedgehog and Wnt) that may play a role in this process. Finally, we define a unique expression domain at the pylorus itself and detect novel pylorus-specific patterns for the transcription factor Gata3 and the secreted protein nephrocan.

Original languageEnglish (US)
Pages (from-to)3205-3217
Number of pages13
JournalDevelopmental Dynamics
Volume238
Issue number12
DOIs
StatePublished - Dec 2009

Keywords

  • Gata3
  • Hedgehog signaling
  • Intestinal identity
  • Microarray analysis
  • Wnt signaling

ASJC Scopus subject areas

  • Developmental Biology

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