VPS52 encodes a critical subunit of two distinct protein complexes involved in intracellular membrane trafficking. As a component of the GARP (Golgi-associated retrograde protein) complex, VPS52 mediates retrograde transport from endosomes to the trans-Golgi network (TGN), which is essential for maintaining the cycling of mannose 6-phosphate receptors and proper lysosomal sorting of acid hydrolases 1. VPS52 also functions as part of the EARP (endosome-associated recycling protein) complex, promoting recycling of internalized transferrin receptors from Rab4-positive endosomes to the plasma membrane 2. The protein operates through syntaxin binding interactions and forms obligatory 1:1:1:1 complexes with other subunits 1. VPS52 dysfunction has significant clinical implications, with genetic alterations including loss of heterozygosity and stop-gain mutations found in gastric cancer, where reduced VPS52 expression correlates with poor prognosis 3. Additionally, VPS52 is required for orthopoxvirus extracellular virus formation, as knockout cells show impaired viral egress mechanisms 4. Loss-of-function variants in related genes like VPS50 demonstrate the critical importance of these trafficking complexes in neurodevelopmental disorders 5.