UBXN4 (UBX domain protein 4) functions as a critical platform protein in endoplasmic reticulum-associated protein degradation (ERAD), recruiting both UBQLN1 and VCP to the ER during the degradation of misfolded proteins 1. The protein participates in cellular proteostasis regulation, with its dysfunction potentially precipitating inflammatory stress 2. UBXN4 is subject to proteasomal regulation during cellular processes, as demonstrated in sperm capacitation where it becomes less abundant following proteasomal inhibition 3. The gene shows involvement in WNT signaling pathway regulation through interactions with EVI/WLS, linking it to the ubiquitin-proteasome system 4. Genetic studies have identified UBXN4 as a shared susceptibility gene between obesity and metabolic disorders, potentially involving cholesterol metabolism regulation 5. Additionally, UBXN4 expression is influenced by genomic variants in the 2q21.3 chr2 region, particularly in immune cells where it may impact neutrophil and white blood cell counts 6. The gene appears in multiple disease contexts including inflammatory bowel disease, where it functions as a potential mediator of protective microbial effects 2, and serves as a potential prognostic marker in lung cancer 7.