FRET biosensor uncovers cAMP nano-domains at β-adrenergic targets that dictate precise tuning of cardiac contractility

cAMP/PKA signalling plays important roles in physiology, but there are a lack of tools to spatially distinguish cAMP. Here the authors present a FRET-based cAMP biosensor they call CUTie that can directly compare cAMP signals at multiple subcellular sites and detect nanoscale heterogeneity in cAMP in cardiac myocytes.