The function of ARL1 (ARF like GTPase 1, ENSG00000120805) is as follows. GTP-binding protein that recruits several effectors, such as golgins, arfaptins and Arf-GEFs to the trans-Golgi network, and modulates their functions at the Golgi complex (PubMed:21239483, PubMed:22679020, PubMed:27373159, PubMed:27436755, PubMed:9624189, PubMed:12972563). Plays thereby a role in a wide range of fundamental cellular processes, including cell polarity, innate immunity, or protein secretion mediated by arfaptins, which were shown to play a role in maintaining insulin secretion from pancreatic beta cells (PubMed:22981988). {ECO:0000269|PubMed:12972563, ECO:0000269|PubMed:21239483, ECO:0000269|PubMed:22679020, ECO:0000269|PubMed:22981988, ECO:0000269|PubMed:27373159, ECO:0000269|PubMed:27436755, ECO:0000269|PubMed:9624189}.