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Scientists create colorful 'brainbow' images of the nervous system
Date:10/31/2007

CAMBRIDGE, Mass. -- By activating multiple fluorescent proteins in neurons, neuroscientists at Harvard University are imaging the brain and nervous system as never before, rendering their cells in a riotous spray of colors dubbed a "Brainbow."

The technique is described in the cover story of the Nov. 1 issue of the journal Nature by a team led by Harvard's Jean Livet, Joshua R. Sanes, and Jeff W. Lichtman.

Brainbow allows researchers to tag neurons with roughly 90 distinct colors, a huge leap over the mere handful of shades possible with current fluorescent labeling. By permitting visual resolution of individual brightly colored neurons, this increase should greatly help scientists in charting the circuitry of the brain and nervous system.

"In the same way that a television monitor mixes red, green, and blue to depict a wide array of colors, the combination of three or more fluorescent proteins in neurons can generate many different hues," says Lichtman, professor in the Department of Molecular and Cellular Biology and the Center for Brain Science in Harvard's Faculty of Arts and Sciences. "There are few tools neuroscientists can use to tease out the wiring diagram of the nervous system; Brainbow should help us much better map out the brain and nervous system's complex tangle of neurons."

Equal parts pointillism, fauvism, and abstract expressionism, the resulting images could also help scientists identify how brain wiring goes awry in many different diseases. Brainbow could also help track the complicated development of the mammalian nervous system, currently understood only in general terms. This, in turn, could elucidate the origins of the many brain disorders that arise early in development.

Drawing upon a mix of genetic tricks and special proteins that cause cells to glow, Brainbow uses a well-known genetic recombination system known as Cre/lox in a new way, to shuffle genes encoding green, yellow, orange, and r
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Contact: Steve Bradt
steve_bradt@harvard.edu
617-496-8070
Harvard University
Source:Eurekalert

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