A pond alga's light sensor wins the Nobel
The 2026 Nobel Prize in Physiology or Medicine went to Karl Deisseroth (55, Stanford), Peter Hegemann (72, Humboldt University) and Georg Nagel (73, University of Würzburg) for optogenetics 97.
It began in the early 1990s at the Max Planck Institute, with Hegemann wondering how a single-celled green alga, Chlamydomonas, swims toward light 97. He and Nagel found the answer: channelrhodopsin, a protein in the cell membrane that opens as an ion channel when blue light hits it, and that kept working when they put it in other cells 9780. Deisseroth put the gene into mammalian neurons in 2005 and by 2007 was switching specific circuits on and off in freely moving mice 80. "We're not using light to collect information, we're using light to cause things to happen," he told STAT, with "millisecond precision and the cellular resolution that is essential to brain function" 97.
What each field noticed (2)
Ars Technica Controlling the brain with light earns a physiology Nobel
Ars looked at why the algal protein won when other ideas didn't. The earlier ways of forcing neurons to fire needed several inserted genes, very specific chemicals, or lasers strong enough to damage the cells, so most never caught on 150. It also notes the Nobel committee called the basic idea obvious, and "the easiest way" turned out not to be easy 150.
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Optogenetics wins the Nobel – one neuroscience breakthrough in a line of technological innovations helping scientists map and control the brain
The Conversation's neuroscientist author set the prize inside a longer run: Cajal painting neurons stained with silver in the late 1800s, tracing methods in the 1970s, then fMRI, then light as a control knob 136. The pattern, in their telling, is visualize the brain, measure it, then control it 136.
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