The Nobel Assembly at Karolinska Institutet has awarded the 2026 Nobel Prize in Physiology or Medicine jointly to Karl Deisseroth of The Howard Hughes Medical Institute and Stanford University, Peter Hegemann of Humboldt University of Berlin, and Georg Nagel of University of Würzburg. They were honored for discovering light-gated ion channels and developing optogenetics, a method that enables scientists to control nerve cells with light. This breakthrough allows researchers to map how nerve cells shape memories, feelings, and behaviors in the living brain.
The journey 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 that opens in response to blue light, allowing ions to flow into cells. Karl Deisseroth later introduced the gene for channelrhodopsin into rat nerve cells, demonstrating in 2005 that light could trigger neural signals. By 2007, he had successfully used this technique in the brains of living mice.
Optogenetics has since revolutionized neuroscience, helping identify neural circuits linked to specific memories, emotions, and behaviors. It is also being explored in clinical settings, such as restoring sight in visually impaired patients. As Per Svenningsson, Chair of the Nobel Committee, noted, optogenetics offers a powerful new way to explore the brain, transforming our understanding of how it works.
Source: Hacker News · Summarized by HeadlinesBriefing