Interferon regulatory factor 6 (IRF6)

Interferon regulatory factor 6 (IRF6) is a member of the IRF family of transcription factors, characterized by a conserved N-terminal DNA-binding helix-turn-helix domain and a less conserved C-terminal protein-binding domain. Unlike other IRFs involved in immune signaling, IRF6 plays a central role in epithelial differentiation, specifically orchestrating the balance between keratinocyte proliferation and terminal differentiation. It is essential for proper formation of the periderm and oral epithelium, which are necessary for the fusion of the lip and palate during embryogenesis. IRF6 regulates cell-cell adhesion proteins such as E-cadherin, affecting the resistance of epithelial layers to mechanical stress and the proper localization of junctional proteins. Mutations in IRF6 are causative for congenital disorders such as Van der Woude syndrome, popliteal pterygium syndrome, and non-syndromic cleft lip and/or palate. It also interacts with other transcriptional regulators such as GRHL3, AP-2α, and components of TGF-β signaling to modulate epidermal and craniofacial development. IRF6 is currently considered a relevant molecular disease target, though no drugs are approved to directly modulate its activity. Safety considerations arise due to its essential developmental functions—loss or inhibition can lead to severe congenital anomalies.

Other names

IRF6IRF-6OFC6VWS1LPSPITPPSPPS1VWS

No approved drugs directly targeting IRF6; its mechanisms are regulatory/genetic rather than classical pharmacodynamics