The function of RAP2A (RAP2A, member of RAS oncogene family, ENSG00000125249) is as follows. Small GTP-binding protein which cycles between a GDP-bound inactive and a GTP-bound active form (PubMed:14966141, PubMed:15342639, PubMed:16246175, PubMed:16540189, PubMed:18930710, PubMed:20159449, PubMed:35293963). In its active form interacts with and regulates several effectors including MAP4K4, MINK1 and TNIK (PubMed:14966141, PubMed:15342639, PubMed:18930710, PubMed:20159449). Part of a signaling complex composed of NEDD4, RAP2A and TNIK which regulates neuronal dendrite extension and arborization during development (PubMed:20159449). More generally, it is part of several signaling cascades and regulates cytoskeletal rearrangements, cell migration, cell adhesion and cell spreading (PubMed:14966141, PubMed:15342639, PubMed:16246175, PubMed:16540189, PubMed:18930710, PubMed:20159449, PubMed:35293963). {ECO:0000269|PubMed:14966141, ECO:0000269|PubMed:15342639, ECO:0000269|PubMed:16246175, ECO:0000269|PubMed:16540189, ECO:0000269|PubMed:18930710, ECO:0000269|PubMed:20159449, ECO:0000269|PubMed:35293963}.