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Receptor for Wnt proteins. Most of frizzled receptors are coupled to the beta-catenin (CTNNB1) canonical signaling pathway, which leads to the activation of disheveled proteins, inhibition of GSK-3 kinase, nuclear accumulation of beta-catenin (CTNNB1) and activation of Wnt target genes. Plays a critical role in retinal vascularization by acting as a receptor for Wnt proteins and norrin (NDP). In retina, it can be both activated by Wnt protein-binding, but also by a Wnt-independent signaling via binding of norrin (NDP), promoting in both cases beta-catenin (CTNNB1) accumulation and stimulation of LEF/TCF-mediated transcriptional programs. A second signaling pathway involving PKC and calcium fluxes has been seen for some family members, but it is not yet clear if it represents a distinct pathway or if it can be integrated in the canonical pathway, as PKC seems to be required for Wnt-mediated inactivation of GSK-3 kinase. Both pathways seem to involve interactions with G-proteins. May be involved in transduction and intercellular transmission of polarity information during tissue morphogenesis and/or in differentiated tissues.
Gene Name: | frizzled class receptor 4 |
Family/Subfamily: | GPCR , Frizzled |
Synonyms: | FZD4, CD344, CD344 antigen, EVR1, Frizzled family receptor 4, Frizzled-4, Fz-4, Fz4, HFz4, Exudative vitreoretinopathy 1, FEVR, FZD4S, FzE4, Frizzled 4, Frizzled homolog 4, WNT receptor frizzled-4 |
Target Sequences: | NM_012193 NP_036325.2 Q9ULV1 |
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