Transcription factors (TFs) regulate the genome in response to signaling events. Detecting their activity is crucial to deciphering the regulatory networks of cells. Here, we present a protocol for multiplexed TF activity detection using a barcoded plasmid library of optimized "prime" TF reporters in cultured cells. We describe steps for library transfection, RNA processing for barcode sequencing, and a computational pipeline for analyzing differential TF activity, enabling high-throughput and quantitative TF profiling. For complete details on the use and execution of this protocol, please refer to Trauernicht et al.1.
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