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Cell. March 25, 2005; 120 (6): 857-71.

Maternal wnt11 activates the canonical wnt signaling pathway required for axis formation in Xenopus embryos.

Tao Q , Yokota C , Puck H , Kofron M , Birsoy B , Yan D , Asashima M , Wylie CC , Lin X , Heasman J .

Wnt signaling pathways play essential roles in patterning and proliferation of embryonic and adult tissues. In many organisms, this signaling pathway directs axis formation. Although the importance of intracellular components of the pathway, including beta-catenin and Tcf3, has been established, the mechanism of their activation is uncertain. In Xenopus, the initiating signal that localizes beta-catenin to dorsal nuclei has been suggested to be intracellular and Wnt independent. Here, we provide three lines of evidence that the pathway specifying the dorsal axis is activated extracellularly in Xenopus embryos. First, we identify Wnt11 as the initiating signal. Second, we show that activation requires the glycosyl transferase X.EXT1. Third, we find that the EGF-CFC protein, FRL1, is also essential and interacts with Wnt11 to activate canonical Wnt signaling.

PubMed ID: 15797385
Article link: Cell.
Grant support: GM-63891 NIGMS NIH HHS , HD33002 NICHD NIH HHS

Genes referenced: ctnnb1 egf ext1 fzd7 hhex myc myod1 ncam1 otx2 ptpn11 sox17a tcf7l1 tdgf1.3 vegt wnt11 wnt11b wnt5a wnt8a

Morpholinos referenced: wnt11b MO1

Jessen, 2005, Pubmed, Xenbase

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