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Gene Expr Patterns January 1, 2020; 38 119153.
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Dact-4 is a Xenopus laevis Spemann organizer gene related to the Dapper/Frodo antagonist of β-catenin family of proteins.

Dact/Dapper/Frodo members belong to an evolutionarily conserved family of Dishevelled-binding proteins present in mammals, birds, amphibians and fishes that are involved in the regulation of Wnt and TGF-β signaling. In addition to the three established genes (Dact1-3) that compose the Dact family, a fourth paralogue group of related proteins has been recently identified and named Dact-4. Interestingly, Dact-4 is the most rapidly evolving gene of the entire family, as it displays very low homology with other Dact proteins and has lost key conserved domains. Dact-4 is not present in mammals, but weakly conserved homologs were found in reptiles and fishes. Recent RNAseq from our group identified new genes specifically expressed in the Xenopus laevis Spemann organizer. Among these, LOC100170590 mRNA encoded a protein sharing weak homology with a coelacanth Dact-like protein member. Here, by analyzing protein phylogeny and synteny, we show that this organizer gene corresponds to Dact-4. We report that Dact-4 is expressed in the Xenopus blastula pre-organizer region in addition to the gastrula organizer, as well as in placodes, eyes, neural tube, presomitic mesoderm and pronephros. Dact-4-Flag microinjection experiments suggest it is a nucleocytoplasmic protein, as are the other Dact paralogues.

PubMed ID: 33186756
Article link: Gene Expr Patterns
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Species referenced: Xenopus laevis
Genes referenced: chrd.1 dact1 dact3 dact4 dvl2 nog rgmb sst.1
Antibodies: FLAG Ab3
Morpholinos: ctnnb1 MO1

Phenotypes: Xla Wt + ctnnb1 MO (Fig. 4C)

Article Images: [+] show captions