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XB-ART-58712
EMBO Rep 2021 Dec 06;2212:e53185. doi: 10.15252/embr.202153185.
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Lysosomal degradation of the maternal dorsal determinant Hwa safeguards dorsal body axis formation.

Zhu X , Wang P , Wei J , Li Y , Zhai J , Zheng T , Tao Q .


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The Spemann and Mangold Organizer (SMO) is of fundamental importance for dorsal ventral body axis formation during vertebrate embryogenesis. Maternal Huluwa (Hwa) has been identified as the dorsal determinant that is both necessary and sufficient for SMO formation. However, it remains unclear how Hwa is regulated. Here, we report that the E3 ubiquitin ligase zinc and ring finger 3 (ZNRF3) is essential for restricting the spatial activity of Hwa and therefore correct SMO formation in Xenopus laevis. ZNRF3 interacts with and ubiquitinates Hwa, thereby regulating its lysosomal trafficking and protein stability. Perturbation of ZNRF3 leads to the accumulation of Hwa and induction of an ectopic axis in embryos. Ectopic expression of ZNRF3 promotes Hwa degradation and dampens the axis-inducing activity of Hwa. Thus, our findings identify a substrate of ZNRF3, but also highlight the importance of the regulation of Hwa temporospatial activity in body axis formation in vertebrate embryos.

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Species referenced: Xenopus laevis
Genes referenced: ctnnb1 hwa smo wnt11b znrf3
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References [+] :
Bellipanni, Essential and opposing roles of zebrafish beta-catenins in the formation of dorsal axial structures and neurectoderm. 2006, Pubmed