Gene expression in HeLa cells expressing GFP-IRF3 (non-targeting control and clonal knockouts of DDX58, MAVS, ATP13A1, CAPN15, TADA2B, MED16, and MED24) following Sendai virus (SeV) infection or hpRNA transfection

IRF3 translocates from the cytoplasm to the nucleus upon recognition of a cytoplasmic RNA stimulus by RIG-I or MDA5. Using an optical pooled CRISPR knockout screen in HeLa-Cas9 cells, we identified ATP13A1, CAPN15, TADA2B, MED16, and MED24 as novel genes affecting the translocation of IRF3 upon Sendai virus infection. We generated isogenic clonal knockout HeLa-Cas9 lines and confirmed that loss of these five novel genes results in either decreased (ATP13A1 and CAPN15) or increased (TADA2B, MED16, and MED24) translocation of IRF3 upon Sendai virus or synthetic hpRNA stimulation. Biological replicates were defined as replicate stimulations (n = 3 or 4 biological replicates, 1-2 sgRNAs per knockout).