The 2026 Nobel Prize in Physiology or Medicine has been awarded to Karl Deisseroth, Peter Hegemann, and Georg Nagel for their pioneering work in developing optogenetics, a technique that uses light to control brain cells. The announcement was made by the Karolinska Institutet in Stockholm on Monday. Deisseroth, a professor at Stanford University and the Howard Hughes Medical Institute, along with Hegemann of Humboldt University in Berlin and Nagel of the University of Würzburg in Germany, were recognized for their discoveries of light-gated ion channels and the applications of optogenetics in neuroscience.
Optogenetics Discovery
The foundation of optogenetics lies in the discovery of a protein called channelrhodopsin, a light-sensitive ion channel found in the cell membrane of the green alga Chlamydomonas. In the early 1990s, Hegemann and Nagel, then researchers at the Max Planck Institute, investigated how this single-celled organism could detect light to guide its movement. Their experiments revealed that channelrhodopsin opens rapidly when exposed to light, allowing ions to flow through the cell membrane. This property made the protein uniquely suited for use in other cells, as they demonstrated it functioned effectively when introduced into diverse cell types.
Development of the Technique
Deisseroth later advanced the concept by introducing the gene encoding channelrhodopsin into rat nerve cells. This genetic modification enabled scientists to activate or suppress specific neurons in a living brain using precisely timed pulses of light. The method provided unprecedented precision in studying neural circuits, allowing researchers to map brain functions and explore connections between cells, memories, and behaviors. Per Svenningsson, chair of the Nobel Committee for Physiology or Medicine, noted that optogenetics offers a way to map the brain that was once only a dream for scientists.
“Optogenetics provides opportunities for mapping the brain in a way that we could once only dream of,” Svenningsson said. Deisseroth, who received the call first while in the United States, described the moment as unexpected yet delightful. He later spoke with the other two laureates, with whom he shared a long-standing collaboration spanning decades. Their partnership included joint research, conference interactions, and personal friendships, which they characterized as integral to their success.
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Notification Process and Personal Connections
The Nobel Committee successfully contacted all three recipients late at night, with Deisseroth being the first to be notified. He described the moment as unexpected, noting he was “drifting off to sleep” when the call came, and found it “very delightful.” Though he had not yet spoken with his co-laureates, he expressed eagerness to discuss the honor with them.
Impact and Recognition
The technique’s potential extends beyond basic research. Optogenetics is being explored as a tool for understanding and treating neurological disorders by enabling precise intervention in malfunctioning brain circuits. Jeremy Berg, a former editor-in-chief of Science and NIH director, praised Deisseroth’s visionary approach, noting that his work exemplifies the power of combining engineering principles with physiological insight. Berg, who has followed Deisseroth’s career since 2005, said the Nobel recognition was foreseeable given his early contributions.
The Nobel Prize, awarded annually since 1901, has been given 117 times: 40 times to a single individual, and has been shared among two winners 36 times, and among three (the maximum allowed by the Nobel statute) 41 times. There have been 235 award winners since the first medicine prize was awarded in 1901, of which 14 have been women. The youngest recipient was 31, the oldest 87. The winners will receive 12 million Swedish Kronor (SEK).
