MDFIC (MyoD family inhibitor domain containing) is a multifunctional protein with emerging roles in mechanosensation and developmental disease. Primary function: MDFIC acts as an auxiliary subunit of PIEZO1/2 mechanosensitive ion channels, regulating their inactivation kinetics through a lipidated C-terminal helix that inserts into the channel pore module 1. This interaction slows channel kinetics and shifts mechanical sensitivity to higher forces, with implications for somatosensation 2. Mechanism: MDFIC modulates PIEZO channel architecture by promoting a more curved conformation and appears to regulate pore lipids involved in rapid inactivation 3. Additionally, MDFIC interacts with the Wnt/β-catenin destruction complex, stabilizing β-catenin and enhancing its transcriptional activity in epithelial cancer stem cells 4. Disease relevance: Biallelic MDFIC variants cause central conducting lymphatic anomaly (CCLA), characterized by lymphatic vessel mispatterning and valve defects through impaired collective cell migration and integrin β1 activation 5. MDFIC also plays context-dependent roles in cancer, functioning as a tumor suppressor in colorectal cancer but promoting chemoresistance in non-small cell lung cancer 64. Clinical significance: MDFIC emerges as a potential therapeutic target for mechanical allodynia in neuropathic pain and for overcoming chemoresistance in epithelial-type cancer stem cells.