ISL2 is a LIM-homeodomain transcription factor that functions as a critical regulator of neuronal development and differentiation. Structurally, ISL2 contains two tandem LIM domains involved in protein-protein interactions and a DNA-binding homeodomain that enables sequence-specific DNA binding 1. In the developing spinal cord, ISL2 defines motor neuron subclasses and organizes motor pool positioning by restricting specific motor neuronal fates 2. Deletion of Isl2 results in motor pool dispersion, reduced axon branching, disorganized neuromuscular junctions, and impaired sensorimotor connectivity and locomotion 2. ISL2 also plays developmental roles in retinal cell differentiation, appearing in outer nuclear layer photoreceptors, inner nuclear layer cells, and ganglion cells during retinal lamination 3. Beyond development, ISL2 has emerged as a putative tumor suppressor in pancreatic ductal adenocarcinoma, where epigenetic silencing through DNA methylation correlates with poor patient survival 4. Conversely, ISL2 functions as an oncogenic factor in gliomas, where elevated expression promotes angiogenesis through transcriptional activation of ANGPT2 and VEGFA, driving oligodendroglioma malignant transformation 56. ISL2 participates in a feedback regulatory loop with U2AF2, circRNA ARF1, and miR-342-3p that promotes glioma angiogenesis 6. These findings indicate ISL2 has context-dependent roles in development and disease, representing both a potential therapeutic target and developmental biomarker.