POU3F1 is a POU-domain transcription factor that functions as a sequence-specific DNA-binding regulator of gene expression. It binds to octamer motifs in gene promoters and acts cooperatively with SOX family proteins (SOX4, SOX11, SOX12) to activate transcription, while also repressing myelin-specific genes 1. In the nervous system, POU3F1 serves as a molecular marker for glutamatergic cerebellar nuclear neurons and is essential for Schwann cell myelination and remyelination in peripheral nerves 23. POU3F1 expression is activated during promyelination, with only a subset of Schwann cells expressing POU3F1 becoming capable of myelin formation 3. Disease relevance includes psychiatric and neurological disorders: stress-associated epigenetic changes in POU3F1 are correlated with depression pathogenesis 4, and dysregulation of POU3F1 contributes to peripheral neuropathies such as Charcot-Marie-Tooth disease 1. In cancer, SOX12-mediated upregulation of POU3F1 promotes thyroid cancer cell proliferation and invasion 5, and POU3F1 is identified as a key transcription factor in CD4+ T cell dysfunction in systemic lupus erythematosus and as a predictor of liver cancer immunotherapy response 67. Clinically, POU3F1 represents a potential therapeutic target for multiple disease contexts.