YIF1A is a five-span transmembrane protein involved in early secretory pathway transport and Golgi apparatus organization. Functionally, YIF1A recycles between the endoplasmic reticulum (ER) and Golgi apparatus, localizing to the ER-Golgi intermediate compartment (ERGIC) and cis-Golgi 1. The protein maintains Golgi structure through stable multi-protein complexes; knockdown of YIF1A causes partial Golgi disassembly 1. YIF1A contains functionally discrete sites within its transmembrane domains (particularly TM helices 3-4) and cytoplasmic region that regulate ER membrane organization, independent of its established binding partners 2. The protein interacts with Yif1A and Rab GTPases to facilitate ER-to-Golgi vesicle-mediated transport 2. Clinically, YIF1A copy number variations occur in hepatocellular carcinomas (9/98 cases), potentially relating to growth regulation pathways 3. Additionally, YIF1A was identified in a prognostic gene signature for hormone-stimulated prostate cancer progression 4. YIF1A also associates with tumor protein D52 (TPD52), suggesting potential roles in cancer-related pathways 5. Elevated YIF1A expression was observed in squamous cell carcinoma specimens 6. These findings position YIF1A as a trafficking protein with emerging relevance to cancer biology, though its precise oncogenic mechanisms require further investigation.