The simultaneous loss of Arx and Pax4 genes promotes a somatostatin-producing cell fate specification at the expense of the α- and β-cell lineages in the mouse endocrine pancreas

Patrick Collombat, Jacob Hecksher-Sørensen, Vania Broccoli, Jens Krull, Ilaria Ponte, Tabea Mundiger, Julian Smith, Peter Gruss, Palle Serup, Ahmed Mansouri

Research output: Contribution to journalArticlepeer-review

Abstract

The specification of the different mouse pancreatic endocrine subtypes is determined by the concerted activities of transcription factors. However, the molecular mechanisms regulating endocrine fate allocation remain unclear. In the present study, we uncover the molecular consequences of the simultaneous depletion of Arx and Pax4 activity during pancreas development. Our findings reveal a so far unrecognized essential role of the paired-box-encoding Pax4 gene. Specifically, in the combined absence of Arx and Pax4, an early-onset loss of mature α-and β-cells occurs in the endocrine pancreas, concomitantly with a virtually exclusive generation of somatostatin-producing cells. Furthermore, despite normal development of the PP-cells in the double-mutant embryos, an atypical expression of the pancreatic polypeptide (PP) hormone was observed in somatostatin-labelled cells after birth. Additional characterizations indicate that such an expression of PP was related to the onset of feeding, thereby unravelling an epigenetic control. Finally, our data provide evidence that both Arx and Pax4 act as transcriptional repressors that control the expression level of one another, thereby mediating proper endocrine fate allocation.

Original languageEnglish
Pages (from-to)2969-2980
Number of pages12
JournalDevelopment
Volume132
Issue number13
DOIs
Publication statusPublished - Jul 2005

Keywords

  • Arx
  • Endocrine pancreas development
  • Fate specification
  • Hyperglycaemia
  • Mouse
  • Pax4

ASJC Scopus subject areas

  • Cell Biology
  • Anatomy

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