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The Nobel Assembly awarded the medicine prize to Karl Deisseroth, Peter Hegemann and Georg Nagel for research that enabled optogenetics, a way to use light to control selected nerve cells. The technique is widely used in neuroscience research, while most potential medical applications remain under investigation.
The Nobel Assembly announced Monday that Karl Deisseroth, Peter Hegemann and Georg Nagel will share the Nobel Prize in Physiology or Medicine for research that enabled optogenetics, a technique using light to switch selected nerve cells on or off. The method gives researchers a precise way to study activity in brain cells and circuits and is now used in laboratories around the world, the assembly said.
The work joined discoveries across several stages. Hegemann studied how single-celled green algae respond to light, and he and Nagel identified a light-sensitive protein that opens an ion channel when illuminated with blue light. The channel allows an electrical impulse to form. Introducing the protein into other cells can make them responsive to light.
Deisseroth used the gene that controls the protein to create a way to manipulate nerve cells in the brains of living mice. He developed tiny optical fibers to deliver light to cells modified with the light-sensitive gene. Together, these advances made it possible to activate or inhibit particular neurons and circuits while observing how they function.
The prize is worth 12 million Swedish kronor, about $1.2 million, according to the report. Nobel Assembly member Abdel El Manira said optogenetics has helped researchers study disruptions in brain circuits associated with conditions including blindness, depression, addiction and dementia. The award recognizes the research tool and its scientific impact; it does not mean the technique is an established treatment for those conditions.
How Light Changed Brain Research
Optogenetics lets researchers test what particular neurons do by controlling their activity with light, rather than only recording signals or observing correlations. That experimental control can help scientists investigate how brain circuits contribute to behavior and how their activity changes in disease. The approach is valuable because, as University of Pittsburgh researcher Jeremy Berg said, it offers a precise set of tools for experiments that can be difficult to conduct by other means.
The technique is primarily a research method, not a routine clinical intervention. Findings from laboratory studies may inform future treatment research, but the path from understanding a circuit to showing that an intervention is safe and effective in people is substantial. The Nobel recognition reflects the method’s influence on neuroscience, while the clinical prospects remain at different stages of investigation.
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From Algae to Neural Circuits
The discovery began with a biological question: how does a single-celled green alga move toward light? Hegemann’s research, followed by work with Nagel, identified a protein that changes the cell’s electrical activity in response to illumination. This property suggested a way to make other cells light-sensitive by introducing the relevant gene.
Deisseroth’s contribution helped turn that insight into a tool for neuroscience. By delivering light to genetically modified neurons, researchers could influence selected cells in living animals and examine the effects on circuits. The Nobel Assembly described optogenetics as opening a new era in neuroscience. Since then, researchers have used it to investigate brain pathways linked to behavior and disease, though the method does not by itself establish a diagnosis or treatment.
Deisseroth is a Howard Hughes Medical Institute investigator and Stanford University professor. Hegemann is at Humboldt University in Berlin, and Nagel most recently worked at the University of Würzburg, according to the assembly. The medicine prize announcement began the week’s Nobel awards in Stockholm.
““People usually think about light as a way of collecting information to observe things. But this is the opposite of that. This is using light to control things, to make things happen, and to do it in a very precise way.””
— Karl Deisseroth, as quoted by the Associated Press
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Clinical Uses Remain Under Study
The award announcement does not establish that optogenetics can treat the conditions linked to its research findings. Deisseroth said other scientists are pursuing possible treatment approaches for conditions including autism and schizophrenia, but the report does not detail their evidence, trial stages or outcomes. He also said a technique he called direct optogenetics is being used to test a treatment for a genetic form of vision loss, retinitis pigmentosa; the available report provides no further information about the study or its results.
It is also not clear from the report what other light-based approaches may replace or supplement the optical fibers Deisseroth first developed, or how widely any potential clinical applications might be used. For now, the established role described by the assembly is as a research tool for studying neural activity.
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Nobel Week Continues in Stockholm
The medicine announcement opened Nobel week. According to the report, the physics prize was scheduled for Tuesday, chemistry for Wednesday and literature for Thursday, followed by the peace prize on Friday. The Nobel Memorial Prize in Economic Sciences was scheduled for Oct. 12.
For optogenetics, the next developments to watch are findings from research using the method and reported progress in any clinical tests. The Nobel Assembly said there is still much to learn about the brain; specific trial timelines and outcomes for the potential applications mentioned in the report were not provided.
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Key Questions
Who won the Nobel Prize in Medicine?
Karl Deisseroth, Peter Hegemann and Georg Nagel were named the recipients for research that led to optogenetics.
What is optogenetics?
Optogenetics uses light-sensitive proteins and targeted illumination to control selected cells, including neurons. Researchers use it to study how particular brain cells and circuits function.
Is optogenetics an established treatment for brain disorders?
No. The report describes it mainly as a research technique. It mentions possible treatment research, including a test involving a genetic form of vision loss, but gives no results establishing clinical effectiveness.
How much is the Nobel prize worth this year?
The prize is 12 million Swedish kronor, equivalent to about $1.2 million, according to the report.
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