Casein kinase 1 epsilon has been suggested to play a role in phosphorylation of Disheveled in the Wnt signaling pathway. Casein kinase 1 alpha (CK1α) binds to and phosphorylates β‑catenin
In plants the phosphorylation of protein Jade-1 is regulated by casein kinase 1. In humans there are three casein kinase 1 gamma enzymes.
Xenopus casein kinase 1 gamma (CK1gamma) is associated with the cell membrane and binds to LRP. CK1gamma was found to be needed for Wnt signaling through LRP, and is both necessary and sufficient to transduce LRP6 signaling in vertebrates and Drosophila cells. Wnt binding to LRP causes a rapid increase in phosphorylation of the cytoplasmic domain of LRP by CK1gamma. Phosphorylation of LRP6 by CK1gamma promotes binding of axin to LRP and activation of the Wnt signaling pathway.