VPS53 encodes a critical subunit of the GARP (Golgi-associated retrograde protein) complex that mediates retrograde transport from endosomes to the trans-Golgi network (TGN) 1. The protein functions in maintaining mannose 6-phosphate receptor cycling between the TGN and endosomes, which is essential for proper lysosomal sorting of acid hydrolases 2. VPS53 also participates in the EARP complex, promoting endocytic recycling by associating with Rab4-positive endosomes to facilitate transferrin receptor recycling to the plasma membrane 2. Loss-of-function mutations in VPS53 cause severe neurological disorders, including progressive cerebello-cerebral atrophy type 2 (PCCA2) characterized by profound mental retardation, progressive microcephaly, spasticity, and early-onset epilepsy 1. The gene has also been associated with complicated hereditary spastic paraparesis, expanding its disease phenotype beyond PCCA2 3. Mechanistically, VPS53 dysfunction disrupts intracellular cholesterol transport and sphingolipid homeostasis in lysosomes, leading to neurodegeneration 3. In cellular studies, VPS53 demonstrates tumor suppressor properties in colorectal cancer by inducing autophagy signaling pathways 4. The protein's essential role in membrane trafficking makes it crucial for cellular homeostasis and survival.