Nobel-Winning Optogenetics Links Berlin Lab to Hyderabad Parasite Research

The Nobel Prize in Physiology or Medicine 2026 went jointly to Karl Deisseroth, Peter Hegemann and Georg Nagel. They discovered light-gated ion channels and developed optogenetics. Optogenetics is a method that uses light-sensitive proteins to control specific cells with light. The story began with Hegemann's curiosity. He wanted to know why the single-celled alga Chlamydomonas swims towards light. Working with Nagel, he found the protein behind this behaviour: channelrhodopsin. Channelrhodopsin opens under blue light, letting ions flow in to create an electrical signal. Deisseroth later placed this protein inside animal neurons. Blue light could trigger nerve signals in rats (2005). Blue light could control behaviour in mice (2007).

This discovery did not stay limited to neuroscience. Proteins and enzymes that respond to light can be inserted into almost any cell type. They are not just for neurons. This made optogenetics a general toolkit for biology. Researchers can use it wherever they need precise, switch-like control over a cellular process. The 2026 prize recognises this broader idea. A tool built to study how algae sense light became a way to study the brain, infection, and basic cell biology alike.