title: HNF-3 beta is essential for node and notochord formation in mouse development.
abstract: HNF-3 beta, a member of the HNF-3/fork head family of transcription factors, is expressed in the node, notochord, floor plate, and gut in mouse embryos. A null mutation of this gene leads to embryonic lethality. The primary defect of HNF-3 beta -/- embryos is an absence of organized node and notochord formation, which leads to secondary defects in dorsal-ventral patterning of the neural tube. In contrast, patterning along the anterior-posterior axis was surprisingly little affected. Although HNF-3 beta is required for node and notochord formation, some organizer activity persists in the absence of these structures. HNF-3 beta is not required for the development of definitive endoderm cells, but foregut morphogenesis is severely affected in HNF-3 beta -/- embryos.
authors.affiliation: Samuel Lunenfeld Research Institute, Mount Sinai Hospital, Toronto, Ontario, Canada.
authors.forename: S L
authors.initials: SL
authors.lastname: Ang
authors.forename: J
authors.initials: J
authors.lastname: Rossant
mesh_terms: D000818:Animals; D001483:Base Sequence; D002490:Central Nervous System / Q000196:embryology*; D002678:Chimera; D003433:Crosses, Genetic; D004268:DNA-Binding Proteins / Q000032:analysis / Q000235:genetics / Q000502:physiology*; D004064:Digestive System / Q000196:embryology; D005314:Embryonic and Fetal Development; D005260:Female; D005775:Gastrula / Q000502:physiology; D005804:Genes, Lethal; D051542:Hepatocyte Nuclear Factor 3-beta; D008297:Male; D008648:Mesoderm / Q000737:chemistry; D051379:Mice; D008810:Mice, Inbred C57BL; D008969:Molecular Sequence Data; D009672:Notochord / Q000196:embryology*; D009687:Nuclear Proteins / Q000235:genetics / Q000502:physiology*; D010641:Phenotype; D014157:Transcription Factors / Q000235:genetics / Q000502:physiology*
chemical_list: D004268:DNA-Binding Proteins; C496503:Foxa2 protein, mouse; D009687:Nuclear Proteins; D014157:Transcription Factors; D051542:Hepatocyte Nuclear Factor 3-beta