Whether mutations in cancer driver genes directly affect cancer immune phenotype and T cell immunity remains a standing question. ARID1A is a core member of the polymorphic BAF chromatin remodeling complex. ARID1A mutations occur in human cancers and drive cancer development. Here, we studied the molecular, cellular, and clinical impact of ARID1A aberrations on cancer immunity. We demonstrated that ARID1A aberrations resulted in limited chromatin accessibility to interferon (IFN) responsive genes, caused impaired IFN-gene expression, anemic T cell tumor infiltration, poor tumor immunity, and shortened host survival in many human cancer histologies as well as in murine cancer models. Impaired IFN signaling was associated with poor immunotherapy response. Mechanistically, ARID1A interacted with EZH2 via its carboxyl terminal and antagonized 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.
Jing Li, Weichao Wang, Yajia Zhang, Marcin Cieślik, Jipeng Guo, Mengyao Tan, Michael D. Green, Weimin Wang, Heng Lin, Wei Li, Shuang Wei, Jiajia Zhou, Gaopeng Li, Xiaojun Jing, Linda Vatan, Lili Zhao, Benjamin Bitler, Rugang Zhang, Kathleen R. Cho, Yali Dou, Ilona Kryczek, Timothy A. Chan, David Huntsman, Arul M. Chinnaiyan, Weiping Zou