title: Prox1 activity controls pancreas morphogenesis and participates in the production of "secondary transition" pancreatic endocrine cells.
abstract: The development of the mammalian pancreas is governed by various signaling processes and by a cascade of gene activation events controlled by different transcription factors. Here we show that the divergent homeodomain transcription factor Prox1 is a novel, crucial regulator of mouse pancreas organogenesis. Loss of Prox1 function severely disrupted epithelial pancreas morphology and hindered pancreatic growth without affecting significantly the genesis of endocrine cells before E11.5. Conversely, the lack of Prox1 activity substantially decreased the formation of islet cell precursors after E13.5, during a period known as the "secondary transition". Notably, this defect occurred concurrently with an abnormal increment of exocrine cells. Hence, it is possible that Prox1 contributes to the allocation of an adequate supply of islet cells throughout pancreas ontogeny by preventing exocrine cell differentiation of multipotent pancreatic progenitors. Prox1 thus appears to be an essential component of a genetic program destined to produce the cellular complexity of the mammalian pancreas.
authors.affiliation: Department of Genetics and Tumor Cell Biology, St. Jude Children's Research Hospital, 332 N. Lauderdale, Memphis, TN 38105-2794, USA.
authors.forename: Junfeng
authors.initials: J
authors.lastname: Wang
authors.forename: Gamze
authors.initials: G
authors.lastname: Kilic
authors.forename: Muge
authors.initials: M
authors.lastname: Aydin
authors.forename: Zoe
authors.initials: Z
authors.lastname: Burke
authors.forename: Guillermo
authors.initials: G
authors.lastname: Oliver
authors.forename: Beatriz
authors.initials: B
authors.lastname: Sosa-Pineda
mesh_terms: D000818:Animals; D001483:Base Sequence; D002453:Cell Cycle; D002454:Cell Differentiation; D018076:DNA, Complementary / Q000235:genetics; D020869:Gene Expression Profiling; D018507:Gene Expression Regulation, Developmental; D005865:Gestational Age; D018398:Homeodomain Proteins / Q000235:genetics / Q000502:physiology*; D007515:Islets of Langerhans / Q000166:cytology / Q000196:embryology*; D051379:Mice; D018345:Mice, Knockout; D009024:Morphogenesis; D039902:Multipotent Stem Cells / Q000166:cytology; D020411:Oligonucleotide Array Sequence Analysis; D010179:Pancreas / Q000166:cytology / Q000196:embryology*; D015398:Signal Transduction; D014157:Transcription Factors / Q000235:genetics / Q000502:physiology*; D015533:Transcriptional Activation; D025521:Tumor Suppressor Proteins; D000098551:Prospero-Related Homeobox 1 Protein
chemical_list: D018076:DNA, Complementary; D018398:Homeodomain Proteins; D014157:Transcription Factors; D025521:Tumor Suppressor Proteins; D000098551:Prospero-Related Homeobox 1 Protein