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Biol Open 2017 Dec 15;612:1861-1868. doi: 10.1242/bio.026963.
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Frizzled-7 is required for Xenopus heart development.

Abu-Elmagd M , Mulvaney J , Wheeler GN .

Wnt signalling regulates cardiogenesis during specification of heart tissue and the morphogenetic movements necessary to form the linear heart. Wnt11-mediated non-canonical signalling promotes early cardiac development whilst Wnt11-R, which is expressed later, also signals through the non-canonical pathway to promote heart development. It is unclear which Frizzled proteins mediate these interactions. Frizzled-7 (fzd7) is expressed during gastrulation in the mesodermal cells fated to become heart, and then in the primary heart field. This expression is complementary to the expression of wnt11 and wnt11-R We further show co-localisation of fzd7 with other early- and late-heart-specific markers using double in situ hybridisation. We have used loss of function analysis to determine the role of fzd7 during heart development. Morpholino antisense oligonucleotide-mediated knockdown of Fzd7 results in effects on heart development, similar to that caused by Wnt11 loss of function. Surprisingly, overexpression of dominant-negative Fzd7 cysteine rich domain (Fzd7 CRD) results in a cardia bifida phenotype, similar to the loss of wnt11-R phenotype. Overexpression of Fzd7 and activation of non-canonical wnt signalling can rescue the effect of Fzd7 CRD. We propose that Fzd7 has an important role during Xenopus heart development.

PubMed ID: 29101100
PMC ID: PMC5769647
Article link: Biol Open
Grant support: [+]

Species referenced: Xenopus laevis
Genes referenced: fzd7 gata6 nkx2-5 tnni3 wnt11 wnt11b
Morpholinos: fzd7 MO2

Article Images: [+] show captions
References [+] :
Abu-Elmagd, Frizzled7 mediates canonical Wnt signaling in neural crest induction. 2006, Pubmed, Xenbase