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HNF-3 beta is essential for node and notochord formation in mouse development.

Authors:
Ang SL, Rossant J
Affiliation:
Journal:
Cell

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.

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