PRRX1 (paired related homeobox 1) is a transcription factor that functions as both a transcriptional repressor and activator, depending on cellular context. As a repressor, PRRX1 regulates cell fate determination and lineage differentiation across multiple tissue types 1. In neuroblastoma, PRRX1 acts as a key driver of mesenchymal cell identity by reprogramming super-enhancer landscapes, enabling cellular interconversion between undifferentiated mesenchymal and committed adrenergic states 1. Similarly, in triple-negative breast cancer, PRRX1 drives mesenchymal features by reprogramming super-enhancer landscapes in basal cells 2. PRRX1 also marks skeletal stem cells involved in bone fracture healing, with lineage-tracing studies showing that Prrx1+ cells generate spatially distinct subsets of chondrocytes and osteoblasts during repair 3. In pathological contexts, PRRX1 contributes to cancer progression as part of NUP98 fusion oncoproteins in pediatric leukemias 4 and regulates immunosuppressive pericyte function in esophageal cancer metastasis 5. Additionally, PRRX1 plays roles in tissue homeostasis, including cartilage maintenance 6, hematopoietic regulation 7, and kidney fibrosis through downstream TNC signaling 8. These diverse functions highlight PRRX1's critical role in developmental programs, tissue repair, and disease pathogenesis.