GCC1 encodes GCC88, a trans-Golgi network (TGN) membrane tether and golgin protein essential for Golgi architecture maintenance 1. As a coiled-coil domain protein, GCC88 functions as a vesicle capture protein that mediates endosome-derived vesicle docking at the TGN, with specificity for distinct cargo populations 2. GCC1 regulates the balance between compact Golgi ribbon and dispersed mini-stack structures through actin-dependent mechanisms, requiring interaction with intersectin-1 (ITSN-1), a Cdc42 guanine nucleotide exchange factor 3. The Golgi ribbon organization maintained by GCC88 has broader cellular consequences: ribbon fragmentation leads to loss of mTOR localization at the Golgi, resulting in increased autophagy 1. Beyond structural roles, GCC1 participates in trans-Golgi to endosome transport, facilitating endosomal release of therapeutic oligonucleotides 4. Genetically, GCC1 is a type 2 diabetes susceptibility locus in East Asian populations 5. GCC1 localizes to the trans-Golgi network alongside other trans-Golgi markers like TGN46 6. These findings establish GCC1 as a critical regulator integrating Golgi structural dynamics with cellular signaling and membrane trafficking, with implications for metabolic disease and neurodegeneration.