Open AccessGenome‐Wide CRISPR‐Cas9 Screening Identifies NF‐κB/E2F6 Responsible for EGFRvIII‐Associated Temozolomide Resistance in Glioblastoma
Author(s) -
Huang Kai,
Liu Xing,
Li Yansheng,
Wang Qixue,
Zhou Junhu,
Wang Yunfei,
Dong Feng,
Yang Chao,
Sun Zhiyan,
Fang Chuan,
Liu Chaoyong,
Tan Yanli,
Wu Xudong,
Jiang Tao,
Kang Chunsheng
Publication year - 2019
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.201900782
Subject(s) - temozolomide , cancer research , crispr , biology , gene , genetics , glioblastoma
Amplification of epidermal growth factor receptor (EGFR) and active mutant EGFRvIII occurs frequently in glioblastoma (GBM) and contributes to chemo/radio‐resistance in various cancers, especially in GBM. Elucidating the underlying molecular mechanism of temozolomide (TMZ) resistance in GBM could benefit cancer patients. A genome‐wide screening under a clustered regularly interspaced short palindromic repeats (CRISPR)‐Cas9 library is conducted to identify the genes that confer resistance to TMZ in EGFRvIII‐expressing GBM cells. Deep sgRNA sequencing reveals 191 candidate genes that are responsible for TMZ resistance in EGFRvIII‐expressing GBM cells. Notably, E2F6 is proven to drive a TMZ resistance, and E2F6 expression is controlled by the EGFRvIII/AKT/NF‐κB pathway. Furthermore, E2F6 is shown as a promising therapeutic target for TMZ resistance in orthotopic GBM cell line xenografts and GBM patient‐derived xenografts models. After integrating clinical data with paired primary–recurrent RNA sequencing data from 134 GBM patients who received TMZ treatment after surgery, it has been revealed that the E2F6 expression level is a predictive marker for TMZ response. Therefore, the inhibition of E2F6 is a promising strategy to conquer TMZ resistance in GBM.