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Bright and fast multicoloured voltage reporters via electrochromic FRET.


ABSTRACT: Genetically encoded fluorescent reporters of membrane potential promise to reveal aspects of neural function not detectable by other means. We present a palette of multicoloured brightly fluorescent genetically encoded voltage indicators with sensitivities from 8-13% ?F/F per 100 mV, and half-maximal response times from 4-7 ms. A fluorescent protein is fused to an archaerhodopsin-derived voltage sensor. Voltage-induced shifts in the absorption spectrum of the rhodopsin lead to voltage-dependent nonradiative quenching of the appended fluorescent protein. Through a library screen, we identify linkers and fluorescent protein combinations that report neuronal action potentials in cultured rat hippocampal neurons with a single-trial signal-to-noise ratio from 7 to 9 in a 1 kHz imaging bandwidth at modest illumination intensity. The freedom to choose a voltage indicator from an array of colours facilitates multicolour voltage imaging, as well as combination with other optical reporters and optogenetic actuators.

SUBMITTER: Zou P 

PROVIDER: S-EPMC4134104 | biostudies-literature | 2014 Aug

REPOSITORIES: biostudies-literature

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Bright and fast multicoloured voltage reporters via electrochromic FRET.

Zou Peng P   Zhao Yongxin Y   Douglass Adam D AD   Hochbaum Daniel R DR   Brinks Daan D   Werley Christopher A CA   Harrison D Jed DJ   Campbell Robert E RE   Cohen Adam E AE  

Nature communications 20140813


Genetically encoded fluorescent reporters of membrane potential promise to reveal aspects of neural function not detectable by other means. We present a palette of multicoloured brightly fluorescent genetically encoded voltage indicators with sensitivities from 8-13% ΔF/F per 100 mV, and half-maximal response times from 4-7 ms. A fluorescent protein is fused to an archaerhodopsin-derived voltage sensor. Voltage-induced shifts in the absorption spectrum of the rhodopsin lead to voltage-dependent  ...[more]

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