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Scientists who worked out how to control brain cells with light have won this year's Nobel Prize in physiology or medicine. Karl Deisseroth, Peter Hegemann and Georg Nagel were honored for their research into "light-gated ion channels and optogenetics."

Hegemann, at Humboldt University of Berlin, and Nagel, at the University of Würzburg, wanted to understand how a tiny, single-celled alga called Chlamydomonas senses light. Light sensing is not unique to animals with eyes: organisms throughout the living world use light to detect their surroundings and respond to changes in their environment. Even single-celled organisms have proteins that respond to light. These proteins are used to move toward or away from light, to generate energy and to respond to the various demands of a 24-hour day.

Hegemann and Nagel discovered that Chlamydomonas has a beautifully ingenious mechanism of light detection that relies on a single protein called channelrhodopsin.

Channelrhodopsin is built into the outer membrane of the algal cell. Part of the protein faces the water outside the cell and part faces the inside. The protein also contains a small molecule called retinaldehyde, which is able to absorb light.

When light hits the retinaldehyde inside channelrhodopsin, it changes shape. This makes the channelrhodopsin protein change shape too. That change opens a tiny passage through the cell membrane. Positively charged particles, including sodium, can then flow from the water outside the alga into the cell.

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