MARCHF8 is a membrane-associated E3 ubiquitin ligase that plays crucial roles in immune regulation, viral pathogenesis, and cellular homeostasis. The protein functions primarily by catalyzing K63-linked polyubiquitination of target proteins, leading to their degradation via autophagy-lysosome or proteasomal pathways 1. MARCHF8 exhibits dual roles in viral infections: it can restrict viral replication by targeting viral proteins for degradation, as demonstrated with porcine epidemic diarrhea virus nucleocapsid protein and HSV-1 genomic replication 12, but can also be exploited by viruses like HPV to promote oncogenesis. In HPV-positive head and neck cancers, MARCHF8 is upregulated by E6 oncoprotein and stabilizes the viral E7 oncoprotein by degrading CUL1 and UBE2L3 components of the SCF ubiquitin ligase complex 3. Additionally, MARCHF8 promotes cancer immune evasion by degrading MHC class I proteins, reducing tumor antigen presentation to CD8+ T cells 4. The protein also regulates inflammatory responses by targeting TARM1 for autophagy-dependent degradation in macrophages, providing protection against acute kidney injury 5. In vascular biology, MARCHF8 prevents endothelial senescence by regulating ADAM10 levels, with its expression being negatively regulated by miR-34a-5p 6.