Trio Wins Medicine Nobel For ‘Controlling’ Neurons With Light, Pg1

Key Highlights:

• A trio of scientists, Karl Deisseroth, Peter Hegemann, and Georg Nagel, were awarded the 2026 Nobel Prize in Physiology or Medicine.
• The award recognizes their discoveries leading to optogenetics, a technique that enables the control of specific nerve cells using light.
• Optogenetics allows scientists to switch on or off the activity of individual nerve cells in a living brain with high precision.
• The technique is crucial for studying neurological disorders like schizophrenia, depression, Alzheimer’s, and Parkinson’s diseases.

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Detailed Insights:

• In the 1990s, Peter Hegemann discovered that shining light on the microscopic alga Chlamydomonas rapidly triggered an electric signal.
• He hypothesized that a light-detecting molecule was linked to a protein allowing charged ions to enter cells.
• Georg Nagel confirmed this idea, and the team identified two light-sensitive channel proteins, channelrhodopsin-1 and channelrhodopsin-2.
• Channelrhodopsin-2 opens within 0.2 milliseconds when exposed to light, permitting positively charged ions to flow into a cell and generate an electric signal.
• Karl Deisseroth's team published their first major results in 2005 using rat neurons, and the technique was named optogenetics in 2006.
• In 2007, Deisseroth's group demonstrated control over behavior by stimulating specific neurons in live mice using fiber-optic cables.
• Optogenetics has since been used to identify brain networks involved in pain, attention, sleep, memories, and social behaviors.
• This method provides cell-level precision and millisecond temporal resolution, making it a transformative tool in neuroscience.

Scientific/Technical Concepts Involved:

• Optogenetics: A biological technique combining genetics and optics to control the activity of specific neurons or cells using light.
• Neurons: Fundamental units of the nervous system that transmit electrical and chemical signals throughout the body.
• Channelrhodopsin-2 (ChR2): A light-gated ion channel protein from algae that opens in response to blue light, allowing positive ions into neurons to trigger electrical signals.