Bioluminescent optogenetics (BL-OG)

Driving an opsin with light generated biochemically inside the tissue rather than delivered externally: a luciferase enzyme is fused to or co-expressed with an opsin, and adding its substrate (a luciferin such as coelenterazine) produces light on the spot that activates the opsin — a construct called a luminopsin. This gives wireless, genetically-defined, large-volume modulation with no light-delivery hardware, useful where diffuse, chronic, minimally-invasive control matters more than temporal or spatial precision.

The emitted light is dim, slow and pharmacologically gated by substrate availability, so BL-OG cannot deliver millisecond-scale patterned control: it behaves more like a chemogenetic modulator that happens to work through an optical mechanism. It is mostly a rodent proof-of-concept and a complement to, not a replacement for, hardware-based optogenetics.