The HUSH Complex Dictates EBV-transformed B cell Sensitivity to NK Cell Surveillance Through Repression of NKG2A Ligand γ-Proto-cadherin
Sun, Y.; Kong, I. Y.; Li, W.; Plung, J. S.; Burton, E.; Zhong, L.; Li, S.; Van Besien, H.; Sun, S.; Reyburn, H. T.; Abraham, J.; Roth, L. G.; Gewurz, B. E.
Show abstract
Natural Killer (NK) cells control Epstein-Barr virus (EBV), though how EBV+ B-cells escape NK surveillance to form tumors remains unknown. To gain insights, we performed a human genome-wide CRISPR-Cas9 screen in EBV-transformed lymphoblastoid cell lines (LCL). This revealed that the HUSH complex maintains LCL sensitivity to NK. HUSH knockout (KO) de-repressed LCL protocadherin gamma (PCDHG), typically expressed by neurons. PCDHG expression protected LCLs from NK and was necessary for HUSH KO-driven NK resistance. CRISPR analyses revealed NKG2A/CD94 as the PCDHG NK inhibitory counter-receptor, and NKG2A KO restored NK lysis of HUSH KO LCLs. HUSH perturbation impaired NK control of murine LCL xenografts in vivo. A subset of follicular lymphoma (FL) upregulate PCDHG, and PCDHG KO enhanced FL lysis by NK. Therefore, HUSH plays dual roles in foreign DNA surveillance and in support of NK, potentially as a neuronal dont kill me signal that can be exploited by transformed cells.
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