Title: WDR82 mediated H3K4me3 is associated with tumor proliferation and therapeutic efficacy in pediatric high-grade gliomas mediated in pediatric H3K4me3 Levels Increase with histopathological malignancy in pediatric gliomas.

Pediatric high-grade gliomas (pHGGs) are common malignant brain tumors without effective treatment and poor patient survival. Abnormal posttranslational modification at the histone H3 tail plays critical roles in tumor cell malignancy. We have previously shown that trimethylation of lysine 4 at histone H3 (H3K4me3) plays a significant role in pediatric ependymoma malignancy and is associated with tumor therapeutic sensitivity. Here, we show that H3K4me3 and its methyltransferase WDR82 are elevated in pHGGs. Reduction of H3K4me3 by downregulating WDR82 decreases H3K4me3 promoter occupancy and expression of genes associated with stem cell features, cell proliferation, the cell cycle and DNA damage repair. Reduction of WDR82 mediated H3K4me3 increases the response of pediatric glioma cells to chemotherapy. These findings suggest that WDR82 mediated H3K4me3 is an important determinant of pediatric glioma malignancy and therapeutic response. This highlights the need for a more thorough understanding of the potential of WDR82 as an epigenetic target to increase therapeutic efficacy and improve prognosis for children with malignant gliomas. A set of three SMARTvector inducible lentiviral shRNA plasmids with hEF1 promoter and TurboGFP reporter against human WDR82 Gene