title: Nkx6 transcription factors and Ptf1a function as antagonistic lineage determinants in multipotent pancreatic progenitors.
abstract: The molecular mechanisms that underlie cell lineage diversification of multipotent progenitors in the pancreas are virtually unknown. Here we show that the early fate choice of pancreatic progenitors between the endocrine and acinar cell lineage is restricted by cross-repressive interactions between the transcription factors Nkx6.1/Nkx6.2 (Nkx6) and Ptf1a. Using genetic loss- and gain-of-function approaches, we demonstrate that Nkx6 factors and Ptf1a are required and sufficient to repress the alternative lineage program and to specify progenitors toward an endocrine or acinar fate, respectively. The Nkx6/Ptf1a switch only operates during a critical competence window when progenitors are still multipotent and can be uncoupled from cell differentiation. Thus, cross-antagonism between Nkx6 and Ptf1a in multipotent progenitors governs the equilibrium between endocrine and acinar cell neogenesis required for normal pancreas development.
authors.affiliation: Department of Pediatrics, University of California, San Diego, La Jolla, CA 92093, USA.
authors.forename: Ashleigh E
authors.initials: AE
authors.lastname: Schaffer
authors.forename: Kristine K
authors.initials: KK
authors.lastname: Freude
authors.forename: Shelley B
authors.initials: SB
authors.lastname: Nelson
authors.forename: Maike
authors.initials: M
authors.lastname: Sander
mesh_terms: D000818:Animals; D002454:Cell Differentiation / Q000502:physiology; D019070:Cell Lineage / Q000502:physiology*; D004847:Epithelial Cells / Q000166:cytology / Q000378:metabolism; D018507:Gene Expression Regulation, Developmental / Q000502:physiology; D018398:Homeodomain Proteins / Q000235:genetics / Q000378:metabolism*; D007515:Islets of Langerhans / Q000166:cytology / Q000196:embryology; D051379:Mice; D018345:Mice, Knockout; D008822:Mice, Transgenic; D039902:Multipotent Stem Cells / Q000166:cytology / Q000378:metabolism*; D010179:Pancreas / Q000166:cytology / Q000196:embryology*; D046790:Pancreas, Exocrine / Q000166:cytology / Q000196:embryology; D013234:Stem Cells / Q000166:cytology / Q000378:metabolism*; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*
chemical_list: D018398:Homeodomain Proteins; C491328:Nkx6-1 protein, mouse; D014157:Transcription Factors; C062602:transcription factor PTF1