The Nobel Prize in Physiology or Medicine for 2026 has been awarded to three scientists—Karl Deisseroth, Peter Hegemann, and Georg Nagel—for their groundbreaking research on light-gated ion channels and optogenetics, which explores the complexities of the brain.
The award of 12 million Swedish kronor (about £900,000) was announced by the Nobel assembly at the Karolinska Institute in Stockholm. This year marks the 117th instance the Nobel Prize has been awarded. Notably, out of 235 laureates, only 14 are women, and no Black scientists have yet received the honor.
The trio’s research enabled the development of a light-sensitive switch for controlling nerve cells in living brains, allowing scientists to activate or deactivate them with light. Jonathan Levin, president of Stanford University, expressed that the implications of their discoveries extend beyond basic science, offering potential new treatments for neurological and psychiatric disorders.
Hegemann’s initial research focused on how a green alga called Chlamydomonas swims towards light, discovering a protein in its eye spot that converts light into electrical signals. Hegemann and Nagel identified the proteins, known as channelrhodopsins, and demonstrated that exposure to blue light allowed ions to flow into cells, generating electrical impulses.
Deisseroth advanced this work by introducing channelrhodopsin genes into nerve cells of rats, facilitating light-triggered electrical signals. This was further applied in mice to explore neural networks involved in memory formation.
The applications of their work extend into medicine, particularly in optogenetic therapy. One significant trial successfully partially restored sight in a man blinded by retinitis pigmentosa using light-stimulating goggles and a virus to deliver channelrhodopsin genes.
Experts in the field hailed the laureates’ contributions, which enable researchers to create functional maps of the brain and understand brain function in relation to diseases like dementia and epilepsy. This profound understanding offers hope for future neurological advancements.
