The function of Ensembl gene identifier ENSG00000175866 (BAIAP2, BAR/IMD domain containing adaptor protein 2) is as follows. Adapter protein that links membrane-bound small G proteins to cytoplasmic effector proteins. Necessary for CDC42-mediated reorganization of the actin cytoskeleton and for RAC1-mediated membrane ruffling. Involved in the regulation of the actin cytoskeleton by WASF family members and the Arp2/3 complex. Plays a role in neurite growth, neuronal differentiation and neuronal migration (PubMed:41133935). Acts syngeristically with ENAH to promote filipodia formation. Plays a role in the reorganization of the actin cytoskeleton in response to bacterial infection. Participates in actin bundling when associated with EPS8, promoting filopodial protrusions (PubMed:41133935). {ECO:0000269|PubMed:11130076, ECO:0000269|PubMed:11696321, ECO:0000269|PubMed:14752106, ECO:0000269|PubMed:17115031, ECO:0000269|PubMed:19366662, ECO:0000269|PubMed:41133935}.