GIT1 (GIT ArfGAP 1) is a multidomain scaffold protein that functions as a GTPase-activating protein for ADP-ribosylation factor (ARF) family members 1. It regulates diverse cellular processes through protein-protein interactions and serves as a scaffold that recruits signaling proteins to specific cellular locations 1. In cell migration and adhesion, GIT1 recruits MEK1/ERK to focal adhesions via a Src-dependent pathway after EGF stimulation, promoting cell migration 2. It coordinates with myosin MYO18A and PAK2 to transport protein complexes from focal adhesions to the leading edge 3. In neuronal development, GIT1 recruits GEFs like ARHGEF7/β-PIX to synaptic membranes, locally activating RAC1 for dendritic spine morphogenesis and synapse formation 4. It also regulates GABAergic inhibitory synaptic transmission by coordinating RAC1 and PAK1 activity at GABAergic synapses 4. Clinically, GIT1 dysregulation contributes to cancer progression. MAT2B/GIT1 complexes activate MEK/ERK signaling to promote growth in liver and colon cancer 2. GIT1 has also been identified as a candidate disease gene in genetic disease studies 5, with potential involvement in neurodevelopmental disorders through dysregulated MAPK and Rac signaling 4.