Nobel medicine prize goes to three researchers for optogenetics
In short
The Karolinska Institute announced on October 5 that the 2026 Nobel Prize in Physiology or Medicine goes to Karl Deisseroth of Stanford University, Peter Hegemann of Humboldt University of Berlin and Georg Nagel of the University of Würzburg for “discoveries of light-gated ion channels and optogenetics.” Hegemann and Nagel found the light-sensitive protein channelrhodopsin in algae in the early 2000s, and Deisseroth used it to switch neurons on with blue light. No Japanese researcher won, ending the prospect of a second consecutive Japanese prize in the category.
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The Karolinska Institute in Sweden announced on October 5 that the 2026 Nobel Prize in Physiology or Medicine goes to Karl Deisseroth, a professor at Stanford University in the United States (54), Peter Hegemann of Humboldt University of Berlin (71) and Georg Nagel of the University of Würzburg (73). Asahi Shimbun, Mainichi Shimbun, Yomiuri Shimbun, Nikkei, Sankei Shimbun, Jiji Press and Mynavi News all reported the citation as “discoveries of light-gated ion channels and optogenetics.” [ 3 , 5 , 6 , 7 , 13 , 14 , 15 ]
Hegemann and Nagel began from the single-cell green alga Chlamydomonas, which swims towards light. In the early 2000s they found a light-sensitive protein on its cell surface and named it channelrhodopsin; Asahi Shimbun dates the finding to 2002. Deisseroth introduced the gene for that protein into rat neurons in 2005 and made them fire when blue light was shone on them, according to Asahi, Mynavi News and Jiji Press. Mynavi and Jiji reported that in 2007 he used optical fibres to switch specific circuits in the brains of living mice on and off, changing their behaviour. [ 3 , 5 , 13 , 15 ]
Mynavi News said the technique lets researchers test whether particular neurons cause a behaviour, memory or emotion, rather than only observing which brain regions are active, and Jiji Press said it is used to identify which neural circuits underlie neurological disease. Asahi Shimbun reported that overseas clinical trials have placed channelrhodopsin genes in the eyes of patients with retinitis pigmentosa, with special goggles allowing some to recover part of their sight, and that the US company Nanoscope Therapeutics has applied in Japan for approval of an optogenetic gene therapy for inherited retinal dystrophy. Tokyo Shimbun's headline said clinical trials are also attempting to restore vision in Japan. Atsushi Miyawaki, a team director at the RIKEN Center for Brain Science, told Yomiuri Shimbun that light allows extremely fast on-off control of neuronal excitation and that there is “immeasurable potential” for applications such as treatment of visual impairment. [ 3 , 6 , 13 , 15 , 18 ]
No Japanese researcher received the prize. TBS NEWS DIG, Nippon TV News and Sankei Shimbun reported that a Japanese winner for a second consecutive year did not happen. Ahead of the announcement, TBS NEWS DIG named Masatoshi Takeichi of RIKEN and Masashi Yanagisawa of the University of Tsukuba as researchers whose awards were anticipated, and Mainichi Shimbun listed Yanagisawa and Kazutoshi Mori of Meijo University. Mainichi noted that last year's prize in the category went to Shimon Sakaguchi, a specially appointed professor at Osaka University. [ 2 , 5 , 9 , 10 , 12 , 14 , 21 ]
The three laureates share prize money of 12 million Swedish kronor, and the award ceremony will be held on December 10 in Stockholm, the outlets reported. Yen conversions differed: Asahi Shimbun put the sum at about 189 million yen, Mainichi Shimbun at about 190 million yen and Jiji Press at about 180 million yen. [ 3 , 5 , 15 ]
Why it matters
Outlets describe optogenetics as a technique now used in neuroscience laboratories to link specific nerve circuits to behaviour, memory and disease, and as the basis for experimental treatments aimed at restoring vision. The award keeps attention on gene- and light-based therapies for inherited retinal disease, one of which is under regulatory review in Japan. For Japanese readers, the result means no second consecutive domestic laureate in this category.
Key facts
- The Karolinska Institute announced on October 5, 2026 that the Nobel Prize in Physiology or Medicine goes to Karl Deisseroth, Peter Hegemann and Georg Nagel. [ 3 , 5 , 6 , 7 , 9 , 13 , 14 , 15 , 17 , 21 ]
- The citation is “discoveries of light-gated ion channels and optogenetics.” [ 3 , 5 , 7 , 13 , 14 , 15 ]
- Hegemann and Nagel discovered the light-sensitive protein channelrhodopsin in the single-cell green alga Chlamydomonas in the early 2000s. [ 3 , 5 , 13 , 14 , 15 ]
- Deisseroth introduced the channelrhodopsin gene into rat neurons in 2005 and triggered neural activity with blue light. [ 3 , 13 , 15 ]
- In 2007 Deisseroth used optical fibres to switch specific circuits in the brains of living mice on and off, changing their behaviour. [ 13 , 15 ]
- No Japanese researcher received the prize, the second consecutive year without a Japanese winner in the category. [ 9 , 10 , 12 , 14 , 21 ]
- The prize money is 12 million Swedish kronor, shared by the three laureates, and the award ceremony is on December 10 in Stockholm. [ 3 , 5 , 13 , 15 ]
- Outlets reported potential applications in restoring sight and in research on neurological and psychiatric disease. [ 3 , 13 , 15 , 18 ]
Confirmed by several sources
- The 2026 Nobel Prize in Physiology or Medicine was awarded to Karl Deisseroth, Peter Hegemann and Georg Nagel. [ 3 , 5 , 6 , 7 , 9 , 13 , 14 , 15 , 17 , 21 ]
- The award citation is “discoveries of light-gated ion channels and optogenetics.” [ 3 , 5 , 7 , 13 , 14 , 15 ]
- Hegemann and Nagel discovered the light-sensitive protein channelrhodopsin in the single-cell green alga Chlamydomonas in the early 2000s. [ 3 , 5 , 13 , 14 , 15 ]
- Deisseroth introduced the channelrhodopsin gene into rat neurons in 2005 and triggered neural activity with blue light. [ 3 , 13 , 15 ]
- In 2007 Deisseroth used optical fibres to control specific neural circuits in living mice. [ 13 , 15 ]
- No Japanese researcher received the prize. [ 9 , 10 , 12 , 14 , 21 ]
- The prize money is 12 million Swedish kronor, shared by the three laureates, and the ceremony is on December 10 in Stockholm. [ 3 , 5 , 13 , 15 ]
- NHK News reported that the announcement was scheduled for 6:30 PM Japan time on October 5, from the selection committee in Stockholm. [ 1 ]
- The technique is being applied in research and treatment aimed at restoring vision. [ 3 , 15 , 18 ]
Still unclear
- The yen value of the 12 million Swedish kronor prize. Outlets converting the amount differ — Asahi Shimbun says about 189 million yen, Mainichi Shimbun about 190 million yen and Jiji Press about 180 million yen — without giving an exchange rate.
- Which University of Tokyo professor described Deisseroth as having “opened up the field,” and that professor's relationship to him. This appears only in an Asahi Shimbun headline; the article text is not available in the documents.
- Mainichi Shimbun's statement that optogenetics “makes it possible to draw a map of the brain.” This is a headline only, with no article text, and no other document uses that formulation.
- Whether the Japanese researchers named before the announcement were ever shortlisted. TBS NEWS DIG named Masatoshi Takeichi and Masashi Yanagisawa, and Mainichi Shimbun named Yanagisawa and Kazutoshi Mori, as expected candidates ahead of the announcement; no document says they were finalists.
- NHK News's coverage of the result. The only NHK document available predates the announcement and its article text concerns the announcement schedule plus unrelated headlines.
- Details of the clinical trials in Japan aimed at restoring vision that Tokyo Shimbun refers to. The Tokyo Shimbun document on this carries only a headline, and the outlet's earlier article consists of unrelated stories.
What local media are saying
Timeline, local time
- NHK News reports that the 2026 Nobel Prize in Physiology or Medicine will be announced at 6:30 PM Japan time from the selection committee in Stockholm. [ 1 ]
- TBS NEWS DIG publishes a livestream preview of the announcement, naming Masatoshi Takeichi and Masashi Yanagisawa as researchers whose awards are anticipated. [ 2 ]
- Scheduled time of the announcement by the Karolinska Institute's Nobel committee, Japan time. [ 1 ]
- Asahi Shimbun reports the prize has gone to Karl Deisseroth, Peter Hegemann and Georg Nagel. [ 3 ]
- Yomiuri Shimbun publishes the award along with a comment from Atsushi Miyawaki of the RIKEN Center for Brain Science. [ 6 ]
- TBS NEWS DIG reports that no Japanese researcher received the prize. [ 9 ]
- Mynavi News publishes its technical account of optogenetics and the laureates' work. [ 13 ]
- Jiji Press reports the award details, the prize sum and the December 10 ceremony in Stockholm. [ 15 ]
- Tokyo Shimbun publishes a headline saying clinical trials in Japan are also attempting to restore vision with the technique. [ 18 ]