TMEM140 is a transmembrane protein with multifaceted biological functions across viral, neurological, and immunological contexts. As a protein-binding partner, TMEM140 interacts with the HSV-1 viral protein UL31, where it functions as an antiviral factor by inhibiting viral nucleocapsid egress through competitive binding that impedes UL31-UL34 complex formation 1. In gliomas, TMEM140 expression is significantly elevated compared to normal brain tissue and correlates with adverse clinical outcomes including larger tumor size, higher histological grade, and reduced overall survival 2. TMEM140 knockdown suppresses glioma cell viability, migration, and invasion while promoting G1 phase cell cycle arrest and apoptosis, identifying it as a prognostic marker and therapeutic target 2. Beyond cancer, TMEM140 exhibits disease relevance in multiple contexts: it is upregulated in systemic lupus erythematosus and periodontal disease, serving as a diagnostic marker for these conditions 3, and shows differential DNA methylation in systemic sclerosis with accompanying overexpression in dermal fibroblasts from African American patients 4. Additionally, TMEM140 demonstrates genetic associations with psychosis biotypes through RET and NCAM1 signaling pathways, satisfying Mendelian Randomization criteria for putative causality 5. Dysregulation of TMEM140 appears implicated in optic nerve injury responses in retinal ganglion cells 6. Collectively, TMEM140 represents a pleiotropic gene with implications for viral defense, tumorigenesis, and autoimmune/neuropsychiatric disease pathogenesis.