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XB-ART-10441
Mech Dev. September 1, 2000; 96 (2): 183-95.

A direct screen for secreted proteins in Xenopus embryos identifies distinct activities for the Wnt antagonists Crescent and Frzb-1.



Abstract
To determine the spectrum of secreted proteins that are present in the extracellular space of early Xenopus embryos, a direct secretion screen was performed. Surprisingly, 24% of previously identified bona fide secretory proteins corresponded to four secreted Wnt antagonists of the same family: frzb-1, sizzled, sfrp-2 and crescent. sfrp-2 and crescent are novel components of the growing cocktail of growth factor antagonists secreted by Spemann organizer cells in Xenopus. Crescent is first expressed at blastula, defining a deep endodermal region that may be homologous to the avian hypoblast. Unlike other members of this family of inhibitors, microinjection of crescent mRNA causes the development of cyclopic embryos, even though the amount of anterior neural tissue is normal. In crescent-injected embryos, studies with specific markers indicate that morphogenetic movements of the anterior midline are abnormal, resulting in a more posterior location of prechordal plate and ventral forebrain markers with respect to the developing eye field. The results are discussed in light of recent findings in zebrafish and Xenopus that suggest that Wnt signaling through non-canonical (non-beta-catenin dependent) pathways plays a pivotal role in the regulation of morphogenetic movements.

PubMed ID: 10960783
Article link: Mech Dev.
Grant support: R37 HD021502-14 NICHD NIH HHS , R37 HD21502-14 NICHD NIH HHS

Genes referenced: actl6a chrd.1 egr2 frzb frzb2 gsc ncam1 nog not otx2 sfrp2 shh szl vax1



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