TFAP2B encodes a sequence-specific DNA-binding transcription factor that plays crucial roles in development and disease. The protein binds to consensus sequences to regulate transcription of genes involved in organ development, particularly in renal tubule differentiation where Tfap2b is associated with distal nephron fate specification 1. During kidney development, TFAP2B expression marks distal tubule cell differentiation trajectories 1. In corneal development, TFAP2B specifically regulates corneal endothelial cell-specific genes including COL8A2 and ZP4, with expression localized to the peripheral corneal endothelium 2. The transcription factor undergoes liquid-liquid phase separation (condensation) in the nucleus, where it binds target promoters like ZNF131 to regulate gene expression 3. TFAP2B has opposing roles in cancer: loss of function blocks neuroblast differentiation in neuroblastoma, contributing to oncogenesis 4, while overexpression in lung adenocarcinoma promotes tumor growth through ERK and VEGF/PEDF signaling pathways and correlates with poor prognosis 5. The protein's ability to form nuclear condensates represents a novel mechanism for transcriptional regulation and potential therapeutic targeting 3.