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Dev Biol December 1, 2011; 360 (1): 11-29.

The forkhead transcription factor FoxB1 regulates the dorsal-ventral and anterior-posterior patterning of the ectoderm during early Xenopus embryogenesis.

Takebayashi-Suzuki K , Kitayama A , Terasaka-Iioka C , Ueno N , Suzuki A .

The formation of the dorsal-ventral (DV) and anterior-posterior (AP) axes, fundamental to the body plan of animals, is regulated by several groups of polypeptide growth factors including the TGF-β, FGF, and Wnt families. In order to ensure the establishment of the body plan, the processes of DV and AP axis formation must be linked and coordinately regulated. However, the molecular mechanisms responsible for these interactions remain unclear. Here, we demonstrate that the forkhead box transcription factor FoxB1, which is upregulated by the neuralizing factor Oct-25, plays an important role in the formation of the DV and AP axes. Overexpression of FoxB1 promoted neural induction and inhibited BMP-dependent epidermal differentiation in ectodermal explants, thereby regulating the DV patterning of the ectoderm. In addition, FoxB1 was also found to promote the formation of posterior neural tissue in both ectodermal explants and whole embryos, suggesting its involvement in embryonic AP patterning. Using knockdown analysis, we found that FoxB1 is required for the formation of posterior neural tissues, acting in concert with the Wnt and FGF pathways. Consistent with this, FoxB1 suppressed the formation of anterior structures via a process requiring the function of XWnt-8 and eFGF. Interestingly, while downregulation of FoxB1 had little effect on neural induction, we found that it functionally interacted with its upstream factor Oct-25 and plays a supportive role in the induction and/or maintenance of neural tissue. Our results suggest that FoxB1 is part of a mechanism that fine-tunes, and leads to the coordinated formation of, the DV and AP axes during early development.

PubMed ID: 21958745
Article link: Dev Biol

Species referenced: Xenopus
Genes referenced: acta4 actc1 actl6a dkk1 egr2 emb en2 fgf3 fgf4 fgf8 foxb1 gal.2 gemin2 hoxb9 hoxc6 hoxc9-like krt12.4 krt70 myc myod1 odc1 otx2 pou5f3.2 rax smad7 smad9 sox2 wnt8a
Morpholinos: fgf3 MO1 fgf4 MO1 foxb1 MO1 foxb1 MO2 foxb1 MO3 foxb2 MO1 wnt8a MO3

GEO Series: GSE24562: NCBI

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