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Algae's Light Sensor Unlocks Brain's Secrets
21 Oct
Summary
- A one-celled alga uses a light-sensing protein similar to human eye rhodopsin.
- Scientists used the alga's gene to control animal brain cells with light.
- This research aids understanding of disorders and potential vision restoration.
The intricate mechanisms behind memory, feelings, and behavior in the human brain are being demystified thanks to research on a single-celled alga. Scientists recently awarded the Nobel Prize in Physiology or Medicine focused on Chlamydomonas, a microscopic alga.
This alga possesses a light-sensing protein called channelrhodopsin, which shares remarkable similarities with the rhodopsin found in human eyes. When light is detected, ions rush into the alga, generating a swift electrical signal that directs its movement.
Researchers ingeniously inserted the gene for this alga's channelrhodopsin into living animal neurons. This allowed them to activate or deactivate individual brain cells using targeted light flashes. This precision enabled the pinpointing of specific neural circuits responsible for a wide array of functions, including emotions, memories, and sleep-wake cycles.
This innovative technique is actively being employed to study conditions such as depression, anxiety, and Parkinson's disease. Furthermore, it is showing promise in restoring partial vision for individuals suffering from retinal diseases, all stemming from foundational studies of a humble organism.
