Medicine Nobel to Deisseroth, Hegemann and Nagel for switching brain cells on with light
The Nobel Assembly at Karolinska Institutet awarded the 2026 Nobel Prize in Physiology or Medicine on Monday jointly to Karl Deisseroth of Stanford University, Peter Hegemann of Humboldt University of Berlin and Georg Nagel of the University of Würzburg, for discoveries about light-gated ion channels and optogenetics. Hegemann's laboratory identified channelrhodopsin-1, a protein from green algae that opens in response to light. A year later a team led by Nagel showed that channelrhodopsin-2 had properties that made it usable in other cells. Deisseroth's lab turned the proteins into a working tool, putting them into neurons so that researchers could switch specific cells on or off with pulses of light in living animals. Committee chair Per Svenningsson said the method allows the brain to be mapped 'in a way that we could once only dream of.' The laureates share 12 million Swedish kronor, about $1.2 million.
Optogenetics changed neuroscience from watching the brain to testing it: researchers can now ask what happens when one circuit is turned off. It has been used to study fear, memory, addiction and movement disorders, and early trials are testing light-based treatments in the eye.
No pharmacy change tomorrow. But many of the brain findings in the news over the past fifteen years, on depression circuits, on Parkinson's, came from experiments that used this tool.
The prize rewards a chain: an algae protein, then a better one, then a method. Note that the first two discoveries came from plant biology, not medicine. The physics prize comes Tuesday.
DailyDrop U.S. No. 1 · October 5, 2026