TMEM120A is a multifunctional transmembrane protein with roles in mechanosensation, lipid metabolism, and innate immunity. As a mechanosensitive ion channel, TMEM120A contributes to mechanical pain sensing through nociceptor-specific mechanisms 1, though recent structural evidence suggests it may primarily function as a lipid-metabolizing enzyme rather than a canonical ion channel 2. TMEM120A localizes to the endoplasmic reticulum where it binds coenzyme A and interacts with acyl-CoA synthetases (ACSL1/ACSL3) to facilitate fatty acid re-esterification and lipid homeostasis 3. The protein regulates PIEZO2 mechanosensitive channels by elevating cellular phosphatidic acid and lysophosphatidic acid levels, selectively inhibiting PIEZO2 without affecting PIEZO1 4. Additionally, TMEM120A controls 3D genome organization in adipocytes, with deficiency causing lipodystrophy and metabolic dysfunction through repositioning of lipid metabolism genes 5. In immunity, TMEM120A acts as a key activator of antiviral STING signaling against pathogens like Zika virus 6. These diverse functions highlight TMEM120A's importance in metabolic homeostasis, sensory perception, and immune defense, with potential relevance to lipodystrophy, metabolic disorders, and channelopathies 7.