2026 Nobel Prize in Medicine Goes to the Three Scientists Who Developed Optogenetics

October 5 (IT Home) — From today, the annual Nobel Prize “announcement week” officially begins, with the six prizes revealed one after another. IT Home will bring you daily detailed coverage.

Today, the Nobel Foundation announced that the 2026 Nobel Prize in Physiology or Medicine has been awarded to the following three people, in recognition of their discoveries concerning “light-controlled ion channels and optogenetics”:

Karl Deisseroth, of the Howard Hughes Medical Institute and Stanford University in the United States

Peter Hegemann, of Humboldt University of Berlin in Germany

Georg Nagel, of the University of Würzburg in Germany

The Nobel Assembly said the three scientists’ research advanced the development of optogenetics. The technique uses light signals to control the activity of nerve cells precisely, allowing researchers to observe how neurons in a living brain influence memory, emotion and behaviour, and opening a new direction for neuroscience research.

The research began with an exploration of single-celled algae. Peter Hegemann had long been curious about how Chlamydomonas swims towards light. In the early 2000s, he and Georg Nagel discovered a protein with a special function: channelrhodopsin. This protein sits on the surface of algal cells and, when struck by blue light, opens an ion channel, letting charged ions enter the cell and thereby generating an electrical signal.

The researchers further discovered that introducing this protein into any kind of cell made that cell sensitive to light. This finding provided the key foundation for using light signals to control cell activity.

Karl Deisseroth then introduced the genes for channelrhodopsin into rat nerve cells. When the researchers shone blue light on these cells, they could trigger nerve signals directly. Deisseroth announced this breakthrough in 2005, and two years later went on to show that this light-controlled “switch” for nerve cells could work in the brains of living mice.

This method of using light to control nerve signals later became known as “optogenetics,” and was quickly adopted in neuroscience research worldwide. Using optogenetics, researchers can precisely manipulate specific neural circuits, so as to study the brain mechanisms associated with particular memories, emotions and behaviours, and further explore how those mechanisms relate to neurological and psychiatric disorders.

Per Svenningsson, chairman of the Nobel Committee for Physiology or Medicine, said optogenetics has given brain research tools that were previously unimaginable, enabling scientists to map neural connections and activity in the brain in new ways.

Beyond basic neuroscience, optogenetics is now beginning to enter the field of clinical medical research, where many researchers are trying to use the technique to help patients with impaired vision recover some visual function.

The Nobel Assembly considers that optogenetics has grown from a basic biological discovery into an important tool for studying the brain, and has fundamentally changed scientists’ understanding of how the brain works. As the research continues, the technique is helping scientists explore further the neural mechanisms behind memory, emotion, behaviour and other complex brain functions.