This document summarizes a presentation on Adenomanous Polypolis Coli (APC) and its role in the Wnt signaling pathway and actin assembly. APC is a main component of the Wnt signaling pathway that regulates β-catenin levels and target gene expression. Mutations in APC are associated with colorectal cancers. The presentation shows that APC can directly nucleate actin assembly through its C-terminal basic domain, without sequence homology to known actin binding domains. APC and mDia1 synergistically promote actin assembly in the presence of profilin and capping protein. While the formin mDia1 remains processively bound to actin filament bar