Nobel Prize in Medicine 2026 honors pioneers of optogenetics

Berlin — Al-Wasat (Iraq)

The Nobel Committee at the Karolinska Institute in Stockholm announced awarding the 2026 Nobel Prize in Physiology or Medicine to three scientists in recognition of their discoveries related to light-sensitive ion channels and their contributions to developing optogenetics, which enabled researchers to control the activity of specific neurons using light.

The prize went to German scientists Peter Hegemann of Humboldt University in Berlin and Georg Nagel of the University of Würzburg, together with American neuroscientist Karl Deisseroth of Stanford University.

The story of the discovery began with research on microscopic algae known as Chlamydomonas reinhardtii, in which Hegemann and Nagel studied proteins capable of responding to light.

The researchers found that one of these proteins functions as a light-sensitive ion channel: the channel opens when exposed to light and allows ions to pass through the cell membrane, producing an electrical signal.

This discovery paved the way for the development of a kind of “light switch” for neurons, allowing light to be used to influence their activity with high precision.

At a later stage, Karl Deisseroth’s team at Stanford University used genetic engineering techniques to introduce the light-sensitive proteins into specific neurons.

That enabled researchers to control the activity of those cells with light pulses, either activating or inhibiting them, providing a precise means to study the functions of neural circuits.

The technique has raised new questions about how the brain works by permitting specific groups of neurons to be turned on or off and observing the outcomes, opening broad avenues for studying memory, emotions and behavior.

The importance of optogenetics lies in its ability to enable scientists to intervene in specific neural circuits and study the effects on brain function.

The technique can be used to study circuits linked to fear, memory, addiction and other functions, and to deepen understanding of mechanisms involved in a number of neurological and psychiatric disorders, including Alzheimer’s, Parkinson’s, schizophrenia, depression and addiction.

At present, the technique’s primary importance is as an advanced research tool that helps scientists understand brain function and the mechanisms of related diseases.

According to Nobel Committee chair Thomas Perlmann, the committee was able to contact the three scientists to inform them of their prize.

The scientists expressed their happiness at receiving the prize and shared it with the researchers whose work contributed to the discovery and development of the technique; each will receive one third of the prize’s monetary award.

In Germany, the wins by Hegemann and Nagel drew political and scientific praise: German Chancellor Friedrich Merz called the prize evidence of the strength of German scientific research, while emphasizing the importance of international cooperation in science.

The discovery exemplifies a scientific path that began with basic research on the light responses of microscopic algae and culminated in the development of an advanced tool used in neuroscience labs to study how memories, emotions and behavior are formed.

With the announcement of the Nobel Prize in Physiology or Medicine, Nobel Week 2026 has begun; it will be followed by announcements for the prizes in Physics, Chemistry, Literature and Peace. The awards ceremony will be held on December 10 in Stockholm, coinciding with the anniversary of the death of the prize’s founder, Alfred Nobel.