Belongs to an adhesion system, probably together with the E-cadherin-catenin system, which plays a role in the organization of homotypic, interneuronal and heterotypic cell-cell adherens junctions (AJs) (By similarity). Nectin- and actin-filament-binding protein that connects nectin to the actin cytoskeleton (PubMed:11024295). May play a key role in the organization of epithelial structures of the embryonic ectoderm (By similarity). Essential for the organization of adherens junctions (PubMed:30463011). Homodimer. Interacts with F-actin, nectin and NECTIN3. Essential for the association of nectin and E-cadherin. Isoform 1/s-afadin does not interact with F-actin. Interacts with ZO-1 and occludin, but probably in an indirect manner. Interacts with RIT1 and RIT2 (By similarity). Interacts with NRXN1 and BCR. Interacts with ADAM10; the interaction locks ADAM10 at adherens junctions following ADAM10 recruitment to adherens junctions by TSPAN33 (PubMed:30463011). Not found at cell-matrix AJs. The PDZ/DHR domain interacts with the C-terminus of nectin and the Pro-rich C-terminal domain interacts with F-actin. A chromosomal aberration involving AFDN is associated with acute leukemias. Translocation t(6;11)(q27;q23) with KMT2A/MLL1. The result is a rogue activator protein. May be due to intron retention. May be due to intron retention.