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Fig. 9. Expression territory comparisons of Vg1/Univin signals with Nodal and
nuclear ß-catenin in sea urchin, chick, zebrafish and
Xenopus. Embryos are depicted before gastrulation. (A) In
the early sea urchin embryo, nuclear ß-catenin is present in the vegetal
pole region while zygotic univin and nodal are expressed in
the overlying presumptive ectoderm. (B) In the chick embryo, Vg1 and
Wnt8c are expressed in the posterior marginal zone and cooperate to induce
nodal expression in the adjacent epiblast and primitive streak.
(C) In the zebrafish embryo, maternal Vg1 transcripts are expressed
ubiquitously, while ß-catenin accumulates in nuclei of the dorsal
marginal zone and zygotic nodal transcripts at the blastoderm margin.
(D) In Xenopus embryos, ß-catenin is stabilized on the
dorsal side while Xnr transcripts and Vg1 are expressed in a
dorsal-to-ventral gradient. Data taken from the published literature
(Skromne and Stern, 2001;
Agius et al., 2000;
Helde and Grunwald, 1993;
Schier and Talbot, 2005) and
this study.
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