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Oldrini, Barbara; Vaquero-Siguero, Nuria; Mu, Quanhua; Kroon, Paula; Zhang, Ying; Galán-Ganga, Marcos; Bao, Zhaoshi; Wang, Zheng; Liu, Hanjie; Sa, Jason K.; Zhao, Junfei; Kim, Hoon; Rodriguez-Perales, Sandra; Nam, Do-Hyun; Verhaak, Roel G. W.; Rabadan, Raul; Jiang, Tao; Wang, Jiguang; Squatrito, Massimo
Nature communications, 08/2020, Letnik: 11, Številka: 1Journal Article
Abstract Temozolomide (TMZ) is an oral alkylating agent used for the treatment of glioblastoma and is now becoming a chemotherapeutic option in patients diagnosed with high-risk low-grade gliomas. The O-6-methylguanine-DNA methyltransferase (MGMT) is responsible for the direct repair of the main TMZ-induced toxic DNA adduct, the O6-Methylguanine lesion. MGMT promoter hypermethylation is currently the only known biomarker for TMZ response in glioblastoma patients. Here we show that a subset of recurrent gliomas carries MGMT genomic rearrangements that lead to MGMT overexpression, independently from changes in its promoter methylation. By leveraging the CRISPR/Cas9 technology we generated some of these MGMT rearrangements in glioma cells and demonstrated that the MGMT genomic rearrangements contribute to TMZ resistance both in vitro and in vivo. Lastly, we showed that such fusions can be detected in tumor-derived exosomes and could potentially represent an early detection marker of tumor recurrence in a subset of patients treated with TMZ.
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in: SICRIS
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