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Learn MoreWhether cancer driver mutation(s) directly drives cancer immune phenotype and immune tolerance remains a standing question. ARID1A is a core member of the polymorphic BAF chromatin remodeling complex. ARID1A mutations frequently occur in human cancers and drive cancer development. Here, we studied the molecular, cellular, and clinical impact of ARID1A gene status on cancer immunity. We demonstrate that ARID1A mutations, limited expression, and deficiency impair interferon(IFN)-responsive gene chromatin accessibility and expression, resulting in anemic T cell tumor infiltration, weakened tumor immunity, and shortened host survival in many human cancer histologies as well as in murine cancer models, and are negatively associated with immunotherapy response. Mechanistically, ARID1A interacts with EZH2 via its carboxyl terminal and antagonizes EZH2-mediated IFN responsiveness. Thus, the interaction between ARID1A and EZH2 defines cancer IFN-responsiveness and immune evasion. Our work indicates that cancer epigenetic driver mutations can shape cancer immune phenotype and immunotherapy. SOURCE: Jing Li (jingdsli@umich.edu) - University of Michigan
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