Abstract
Communication between PATCHED1 (PTCH1) and SMOOTHENED (SMO) is fundamental to Hedgehog (Hh) signal transduction in development and disease. We describe a real-time cell-based SMO functional assay based on SMO activity-dependent changes in cellular cAMP concentrations. This assay is capable of detecting changes in SMO conformation within minutes of PTCH1 inactivation by Hh ligands. As a result, it expands the range of experimental perturbations that can be used to dissect PTCH1-SMO communication, enabling a deeper mechanistic understanding of a longstanding mystery in Hh signal transduction.
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