Retinoic acid-induced expression of Hnf1b and Fzd4 is required for pancreas development in Xenopus laevis

Development. 2018 Jun 8;145(12):dev161372. doi: 10.1242/dev.161372.

Abstract

Retinoic acid (RA) is required for pancreas specification in Xenopus and other vertebrates. However, the gene network that is directly induced by RA signalling in this context remains to be defined. By RNA sequencing of in vitro-generated pancreatic explants, we identified the genes encoding the transcription factor Hnf1β and the Wnt-receptor Fzd4/Fzd4s as direct RA target genes. Functional analyses of Hnf1b and Fzd4/Fzd4s in programmed pancreatic explants and whole embryos revealed their requirement for pancreatic progenitor formation and differentiation. Thus, Hnf1β and Fzd4/Fzd4s appear to be involved in pre-patterning events of the embryonic endoderm that allow pancreas formation in Xenopus.

Keywords: Fzd4; Hnf1β; Pancreas; Retinoic acid.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Cell Differentiation / genetics
  • Frizzled Receptors / biosynthesis*
  • Frizzled Receptors / genetics
  • Gene Expression Regulation, Developmental / genetics
  • Gene Knockdown Techniques
  • Hepatocyte Nuclear Factor 1-beta / biosynthesis*
  • Hepatocyte Nuclear Factor 1-beta / genetics
  • Morpholinos / genetics
  • Organogenesis / genetics*
  • Pancreas / embryology*
  • Tretinoin / metabolism*
  • Wnt Signaling Pathway / genetics
  • Xenopus Proteins / biosynthesis*
  • Xenopus Proteins / genetics
  • Xenopus laevis / embryology*

Substances

  • Frizzled Receptors
  • Fzd4 protein, Xenopus
  • Hnf1b protein, Xenopus
  • Morpholinos
  • Xenopus Proteins
  • Hepatocyte Nuclear Factor 1-beta
  • Tretinoin