Karl Deisseroth, Peter Hegemann and Georg Nagel have won the 2026 Nobel Prize for discovering light-gated ion channels and developing optogenetics.
The Nobel Assembly at Karolinska Institutet has awarded the 2026 Nobel Prizes in Physiology or Medicine to Karl Deisseroth, Peter Hegemann and Georg Nagel. The prize recognizes their discoveries concerning light-gated ion channels and optogenetics, a method that allows researchers to control nerve cells with light.
The research began with Peter Hegemann’s curiosity about how the single-celled alga Chlamydomonas swims toward light. In the early 2000s, Hegemann and Georg Nagel discovered channelrhodopsin, a protein on the surface of the algal cell. When illuminated by blue light, this protein opens a channel, allowing charged ions to flow into the cell and create an electrical impulse.
According to the Nobel Assembly, the scientists found that regardless of which cell they placed the protein in, those cells became light sensitive. This discovery provided the biological foundation for controlling cellular activity with light.
Karl Deisseroth transformed this biological discovery into a tool for neuroscience. He introduced the gene for channelrhodopsin into nerve cells from rats. By illuminating these cells with blue light, he was able to trigger a nerve signal. Deisseroth published this breakthrough in 2005. Two years later, he successfully made this light-controlled switch work in the brains of living mice.
This method, now called optogenetics, has rapidly gained global impact. It allows researchers to map the brain in a way that was previously impossible. Per Svenningsson, Chair of the Nobel Committee for Physiology or Medicine, stated, “Optogenetics provides opportunities for mapping the brain in a way that we could once only dream of.”
Using optogenetics, researchers have been able to reveal neural circuits governing specific memories, feelings, and behaviours relevant for neurological and psychiatric disorders. The Nobel Assembly noted that the method helps show how nerve cells shape these functions in the living brain.
In clinical medicine, researchers are using the method in attempts to restore sight in people with visual impairment. The technique has fundamentally altered the understanding of the brain, moving beyond the “sketch map” of earlier 20th-century research to a more precise understanding of causal relationships in neural activity.
The 2026 prize is the 117th time the award has been given. The three laureates will share a prize amount of 12 million Swedish kronor. The prizes are presented on December 10, the anniversary of the death of prize founder Alfred Nobel.
The laureates are:
Optogenetics has laid the foundation for a new era in neuroscience by providing a precise tool to control and observe specific nerve cells. This technology has enabled scientists to move from correlating brain regions with functions to proving causal relationships, significantly advancing the study of memory, emotion, and behavior. It also offers potential pathways for treating neurological conditions and restoring sensory functions.
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