A New Toolkit to Visualize and Perturb Endogenous LIN-12/Notch Signaling in

Notch signaling mediates cell-cell interactions during development and homeostasis. Methods for visualizing and manipulating Notch activity are essential to elucidate how the Notch pathway functions. Here, we provide new tools for use in to visualize and perturb Notch signaling using endogenously tagged alleles of the Notch receptor . Tagging the endogenous LIN-12 intracellular domain with the fluorescent protein mNeonGreen (mNG) allowed for visualization of both its membrane-localized state and translocation of the Notch intracellular domain into the nucleus upon ligand activation. LIN-12::mNG localized to the nucleus in cells where and when Notch signaling is known to be active and provided a real-time readout of Notch activity that complements existing biosensors and transcriptional reporters. We also report an allele of endogenous that we tagged with both mNG and an auxin-inducible degron, to facilitate conditional LIN-12 protein degradation. This toolkit provides novel reagents for the research community to investigate mechanisms of Notch signaling and its functions .