A Bioluminescent Activity Dependent (BLADe) Platform for Converting Intracellular Activity to Photoreceptor Activation.

Abstract

Genetically encoded sensors and actuators have advanced the ability to observe and manipulate cellular activity, yet few non-invasive strategies enable cells to directly couple their intracellular states to user-defined outputs. We developed a bioluminescent activity-dependent (BLADe) platform that facilitates programmable feedback through genetically encoded light generation. Using calcium (Ca2+) flux as a model, we engineered a Ca2+-dependent luciferase that functions as both a reporter and an activity-gated light source capable of photoactivating light-sensing actuators. In neurons, the presence of luciferin triggers Ca2+ dependent local illumination that provides activity dependent gene expression by activating a light-sensitive transcription factor and control of neural dynamics through opsin activation in single cells, populations and intact tissue. BLADe can be expanded to couple any signal that bioluminescent enzymes can be engineered to detect with the wide variety of photosensing actuators. This modular strategy of coupling an activity dependent light emitter to a light sensing actuator offers a generalizable framework for state dependent cell-autonomous control across biological systems.