Three scientists — Karl Deisseroth, Peter Hegemann and Georg Nagel — have won the 2026 Nobel Prize in Physiology or Medicine for creating and applying optogenetics, a technique that uses light to control nerve cells. The Nobel Assembly at the Karolinska Institute in Stockholm announced the award Monday, saying the trio’s discoveries of light-gated ion channels and their use to switch neurons on and off have transformed how researchers probe brain circuits and behavior. Each laureate will receive an equal share of the 12 million Swedish kronor prize.
The origins of the breakthrough reach back to basic curiosity about a simple green alga. Hegemann, working on Chlamydomonas, investigated how the microorganism steers toward light. He found an eye-spot protein that rapidly converts light into an electrical signal, enabling the alga to swim toward illumination. Together with Nagel, Hegemann identified the responsible proteins — channelrhodopsins — and showed that when exposed to blue light these membrane proteins open and allow ions to flow into cells, creating electrical impulses.
The pair went on to demonstrate that the genetic instructions for channelrhodopsins could make other cell types light-sensitive. When Nagel and Hegemann introduced the genes into frog eggs and later into cultured human and mouse kidney cells, those otherwise nonexcitable cells produced electrical responses to light. This key step revealed that channelrhodopsins could be used as universal tools to control cellular electrical activity.
Deisseroth expanded the work into living brains. He and colleagues inserted channelrhodopsin genes into specific neurons in rodents, then delivered light via tiny optical fibers to trigger activity in those cells. In mice, they were able to produce precise behaviors — for example, causing whisker movements by stimulating motor cortex neurons with light. The approach let researchers not just observe correlations between neural activity and behavior, but directly test causal relationships: turn on a cell population and see what the animal does, silence another group and see what stops.
This causal control of neurons rapidly spawned a suite of experimental tools now grouped as optogenetics — combining genetic targeting of light-sensitive proteins with optical methods to activate or inhibit neurons. The technique has deepened scientific understanding of how neural circuits shape perceptions, emotions, memories and actions. It has been used to dissect networks underlying fear, memory formation and movement, among countless other processes.
Beyond basic neuroscience, optogenetics is influencing medicine. The Nobel announcement highlighted early translational success in vision restoration. In a clinical trial for retinitis pigmentosa, researchers used a harmless viral vector to deliver the gene for a channelrhodopsin into retinal ganglion cells that survive despite loss of native light-sensitive photoreceptors. Patients were then fitted with goggles that capture images and project simplified light patterns onto the retina. One participant regained partial vision, demonstrating the potential for optogenetic therapies to compensate for lost sensory cells.
Experts praised the award as recognition of how a fundamental discovery about a tiny alga led to a powerful method for manipulating the brain. Jonathan Levin, Stanford’s president, noted Deisseroth’s contributions have broadened knowledge of neural circuits that shape behavior and could point to new treatments for neurological and psychiatric conditions. Abdel El Manira of the Karolinska Assembly emphasized the elegant simplicity of the original finding — a protein converting light into electrical signals — and how it paved the way for controlling neurons with unprecedented precision.
Karolinska committee member Anna Wedell underscored the method’s value for building functional maps of the brain. Whereas anatomical studies and correlational data could suggest which structures and cell types are involved in certain functions, optogenetics allows scientists to establish cause-and-effect by selectively activating or silencing distinct cell populations. This ability to pinpoint which cells produce particular behaviors or memories helps researchers better understand disease mechanisms. “By studying healthy brain circuits in animals we get a roadmap for where to look when things go wrong in disorders such as dementia, epilepsy and addiction,” Wedell said.
The 2026 prize marks the 117th award in this category. It also highlights ongoing diversity issues in the history of the Nobel: of the 235 laureates to date, only 14 have been women and none have been Black.
The laureates’ work — from an algae’s eye spot to light-driven control of mammalian brains — illustrates how curiosity-driven research can yield transformative tools. Optogenetics has reshaped neuroscience and opened promising therapeutic avenues, making it one of the most influential innovations in modern brain science.
Read more : - Russia Investigates Pneumonic Plague After Death of Irkutsk Lab Technician
.jpeg)
0 Comments