Nobel Prize in Physiology or Medicine 2026
The 2026 Nobel Prize in Physiology or Medicine has been awarded jointly to Karl Deisseroth, Peter Hegemann and Georg Nagel for their discovery of light-gated ion channels and the foundations of optogenetics.
Hegemann and Nagel’s research began with a single-celled green alga. There, they made a crucial discovery about a light-sensitive protein called channelrhodopsin. When blue light strikes the protein, its ion channel opens, creating a flow of electrical charge in and out of the cell.
Deisseroth then brought this concept into neuroscience. By introducing the channelrhodopsin gene into nerve cells, he demonstrated that specific neurons could be switched on with extraordinary speed using light. Optogenetics was born.
The significance is immense. Billions of neurons work together in our brains. Pinpointing which neuron or neural circuit is involved in memory, fear, emotion or behaviour is extraordinarily difficult.
Optogenetics has given scientists a precise light switch. By turning specific neurons on or off with light, researchers can identify which brain functions they are connected to.
Today, this technology is used in neuroscience laboratories around the world. Beyond understanding how the brain works, it has opened new avenues for research into neurological and psychiatric disorders. Clinical trials based on optogenetics are even exploring the possibility of restoring sight.
What began with a light-sensitive protein in a tiny alga has ultimately given scientists an unprecedented tool for controlling neurons in the brain.
That discovery has now been recognised with the Nobel Prize in Physiology or Medicine. Heartfelt congratulations to the three new Nobel laureates.
