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Can a protein found in a mosquito lead to a better understanding of the workings of our own brains? Prof. Ofer Yizhar and his team in the Weizmann Institute of Science’s Neurobiology Department took a light-sensitive protein derived from mosquitos and used it to devise an improved method for investigating the messages that are passed from neuron to neuron in the brains of mice. This method, reported today in
Neuron, could potentially help scientists solve age-old cerebral mysteries that could pave the way for new and improved therapies to treat neurological and psychiatric conditions.
Yizhar and his lab team develop so-called optogenetic methods – research techniques that allow them to “reverse engineer” the activity of specific brain circuits in order to better understand their function. Optogenetics uses proteins known as rhodopsins to control the activity of neurons in the mouse brain. Rhodopsins are light-sensing proteins – they are most known for their role in organs like the retina rather than in the dark inner reaches of the body. But the rhodopsins in the brains of Yizhar’s mice enable him to control the activity of specific neurons when he and his team shine a minuscule beam of light into the mouse’s brain. He is especially interested in communication between neurons: What signals are getting passed through the synapses, those gaps over which the brain’s signals move? “We can detect the presence of the various neurotransmitters, but different neurons ‘read’ those neurotransmitters differently,” he says. “Optogenetics enables us to not only see the ‘ink,’ but really to decipher the ‘message’.”

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