Cell–cell interactions are key to all biological processes, but there hasn't been a good way to perform inter-cellular screens for genetic regulators of these interactions in vivo. We developed match-seq (multiplexed associative tagging of cell interaction histories) - using engineered virus-like particles to transfer barcoded mRNAs from 'sender' to neighboring 'receiver' cells, so you can reconstruct cellular interactions with sequencing alone, no imaging required. We coupled match-seq with CRISPR + scRNA-seq in cancer, revealing cancer-immune interaction neighborhoods at scale, and new cancer genes that can be targeted for tumor rejection via immune cell interactions. Led by the brilliant @peterdu_ with Bassik lab! biorxiv.org/content/10.64898…