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

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 Hnf1? 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, Hnf1? and Fzd4/Fzd4s appear to be involved in pre-patterning events of the embryonic endoderm that allow pancreas formation in Xenopus.

SUBMITTER: Gere-Becker MB 

PROVIDER: S-EPMC6031401 | biostudies-literature | 2018 Jun

REPOSITORIES: biostudies-literature

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Retinoic acid-induced expression of <i>Hnf1b</i> and <i>Fzd4</i> is required for pancreas development in <i>Xenopus laevis</i>.

Gere-Becker Maja B MB   Pommerenke Claudia C   Lingner Thomas T   Pieler Tomas T  

Development (Cambridge, England) 20180608 12

Retinoic acid (RA) is required for pancreas specification in <i>Xenopus</i> 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 <i>in vitro</i>-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 <i>Hnf1b</i> and <i>Fzd4</i>/<i>Fzd4s</i> in programmed pancreatic explants and  ...[more]

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