STOCKHOLM, October 5 — The Nobel Assembly at Karolinska Institutet has awarded the 2026 Nobel Prize in Physiology or Medicine jointly to American neuroscientist Karl Deisseroth (Stanford University) and German biophysicists Peter Hegemann (Humboldt University of Berlin) and Georg Nagel (University of Würzburg) for their discovery of light-gated ion channels and the invention of optogenetics.
According to the Nobel citation, Hegemann and Nagel identified and biophysically characterized channelrhodopsins—light-sensitive microbial ion-channel proteins found in unicellular green algae (Chlamydomonas reinhardtii). Deisseroth subsequently pioneered the genetic expression of these algal proteins within mammalian brain tissue, engineering optical molecular "switches" that activate or silence individual neural circuits upon illumination with specific wavelengths of laser light. The resulting technology, termed optogenetics, revolutionized neuroscience by allowing researchers to map causal brain pathways governing motor coordination, fear conditioning, depression, and neurodegenerative disorders such as Parkinson's disease with millisecond temporal precision.
The laureates will equally share the 12 million Swedish kronor (approximately $1.15 million) prize purse, along with an 18-carat gold medal and citation diploma, during the formal Nobel investiture ceremonies in Stockholm on December 10.
Nobel Prize laureates, biophysical breakthroughs, and optogenetic applications are high-yield subjects in UPSC GS Paper III (Science & Technology), CSIR NET Life Sciences, and medical entrance examinations. Candidates should remember that the Nobel Prize in Physiology or Medicine is awarded annually by the Nobel Assembly at Karolinska Institutet in Stockholm, Sweden, following Alfred Nobel's 1895 will, with the inaugural prize conferred in 1901 upon Emil von Behring for serum therapy against diphtheria.