In a quiet laboratory in Munich, scientists have unveiled a microscope that lets living cells glow without hitting them with bright lights. This new system, called QIScope, can detect the faintest bioluminescent signals inside cells. By borrowing ideas from telescopes, it reaches a clarity and sensitivity that was once out of reach.
Bioluminescence is nature’s way of letting cells reveal their inner workings with a soft glow. Unlike fluorescence, which shines harsh beams of light that can stress cells, bioluminescence gently illuminates proteins and processes. Its main hurdle has always been that the light is so dim it’s hard to capture.
To tackle this, the team led by Dr. Jian Cui turned to quanta image sensors (QIS), a new camera technology that excels in low light. “To take full advantage of the sensor’s capabilities, we took inspiration from the optical layout of telescopes,” says Ruyu Ma, first author of the study and Doctoral Researcher at the Helmholtz Pioneer Campus.
By blending that design with the QIS camera, they built a microscope that can reveal tiny movements in living cells. With QIScope, researchers watched vesicles drifting inside single cells and spotted proteins that only appear in tiny amounts.
“Our microscope offers higher sensitivity, improved resolution, larger field of view, and higher dynamic range – all things you would want for challenging live-cell imaging experiments,” says Jian Cui.
It even lets scientists switch to traditional fluorescence or phase contrast imaging when needed, so they can compare methods in one setup. Because QIScope can follow these faint signals over hours or days, it opens doors to studying cells exactly as they behave naturally. Researchers can now watch how tissue models or even small organoids change and respond to treatments without disturbing them. This could speed up discoveries in how diseases start and how new drugs work inside living systems.
Beyond single cells, the team envisions QIScope being used to track complicated processes in liver or brain organoids, where subtle changes matter a lot. By capturing low-light events that were once invisible, it may help unravel secrets of cell signaling, gene expression, or early disease markers. In the long run, it could become a staple tool for cell biology, disease modeling, and drug discovery.
With its gentle approach to live-cell imaging, the QIScope represents a shift toward observing life in motion with minimal disturbance. As biologists everywhere seek to understand complex processes over time, this new microscope may show them things they never could see before.
The study has been published in Nature Methods.
