Overview
- The Nobel Prize in Physiology or Medicine was given to Karl Deisseroth, Peter Hegemann and Georg Nagel for their work on light‑controlled ion channels and the development of optogenetics.
- Hegemann and Nagel discovered channelrhodopsins in the single‑celled alga Chlamydomonas, proteins that open an ion channel when exposed to blue light and make cells light‑sensitive.
- Deisseroth adapted those genes for mammalian neurons and in 2005 showed light could trigger neural signals in cultured rat cells and later in live mouse brains.
- Optogenetics lets researchers switch specific neural circuits on or off with precise timing, a capability that has reshaped studies of memory, emotion, behavior and disease models.
- The Nobel Committee noted the technique is moving into early clinical research, including efforts to restore partial vision, but broad medical use still faces technical and regulatory hurdles.