High‐throughput screen to identify and optimize NOT gate receptors for cell therapy

Logic‐gated engineered cells are an emerging therapeutic modality that can take advantage of molecular profiles to focus medical interventions on specific tissues in the body. However, the increased complexity of these engineered systems may pose a challenge for prediction and optimization of their behavior. Here we describe the design and testing of a flow cytometry‐based screening system to rapidly select functional inhibitory receptors from a pooled library of candidate constructs. In proof‐of‐concept experiments, this approach identifies inhibitory receptors that can operate as NOT gates when paired with activating receptors. The method may be used to generate large datasets to train machine learning models to better predict and optimize the function of logic‐gated cell therapeutics.