May be involved in regulation of intracellular signaling pathways during development. Specifically thought to play a role in canonical and/or non-canonical Wnt signaling pathways through interaction with DSH (Dishevelled) family proteins. Can form homodimers and heterodimers with DACT1 or DACT3. Interacts with CSNK1D, PKA catalytic subunit, PKC-type kinase, DVL1, DVL3, VANGL1, VANGL2 and CTNND1 (By similarity). Interacts with DVL2. The C-terminal PDZ-binding motif may mediate interaction with the PDZ domains of DSH (Dishevelled) family proteins. Belongs to the dapper family.