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Mol Cell Biol April 1, 2009; 29 (8): 2118-28.

Xenopus Wntless and the retromer complex cooperate to regulate XWnt4 secretion.

Kim H , Cheong SM , Ryu J , Jung HJ , Jho EH , Han JK .

Wnt signaling is implicated in a variety of developmental and pathological processes. The molecular mechanisms governing the secretion of Wnt ligands remain to be elucidated. Wntless, an evolutionarily conserved multipass transmembrane protein, is a dedicated secretion factor of Wnt proteins that participates in Drosophila melanogaster embryogenesis. In this study, we show that Xenopus laevis Wntless (XWntless) regulates the secretion of a specific Wnt ligand, XWnt4, and that this regulation is specifically required for eye development in Xenopus. Moreover, the Retromer complex is required for XWntless recycling to regulate the XWnt4-mediated eye development. Inhibition of Retromer function by Vps35 morpholino (MO) resulted in various Wnt deficiency phenotypes, affecting mesoderm induction, gastrulation cell movements, neural induction, neural tube closure, and eye development. Overexpression of XWntless led to the rescue of Vps35 MO-mediated eye defects but not other deficiencies. These results collectively suggest that XWntless and the Retromer complex are required for the efficient secretion of XWnt4, facilitating its role in Xenopus eye development.

PubMed ID: 19223472
PMC ID: PMC2663306
Article link: Mol Cell Biol
Grant support: [+]
Genes referenced: chrd.1 msx1 odc1 tbxt vps35 wls wnt4
Morpholinos: vps35 MO1 wls MO1

Article Images: [+] show captions
References [+] :
Baker, Wnt signaling in Xenopus embryos inhibits bmp4 expression and activates neural development. 2000, Pubmed, Xenbase

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