PABPN1 and glioblastoma: Given that arginine methylation of Poly (A) Binding Protein Nuclear 1 (PABPN1) is a known PRMT1 substrate and its expression is associated with GBM aggressiveness [36, 37], we sought to determine whether it contributes directly to the radioresistant phenotype of GBM cells, a possibility that had not yet been experimentally tested.