Open AccessValidation of optical voltage reporting by the genetically encoded voltage indicator VSFP ‐Butterfly from cortical layer 2/3 pyramidal neurons in mouse brain slices
Author(s) -
Empson Ruth M.,
Goulton Chelsea,
Scholtz David,
GalleroSalas Yasir,
Zeng Hongkui,
Knöpfel Thomas
Publication year - 2015
Publication title -
physiological reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.918
H-Index - 39
ISSN - 2051-817X
DOI - 10.14814/phy2.12468
Subject(s) - neuroscience , voltage sensitive dye , population , biology , cortex (anatomy) , cellular neuroscience , membrane potential , medicine , environmental health
Understanding how behavior emerges from brain electrical activity is one of the ultimate goals of neuroscience. To achieve this goal we require methods for large‐scale recording of the electrical activity of specific neuronal circuits. A very promising approach is to use optical reporting of membrane voltage transients, particularly if the voltage reporter is genetically targeted to specific neuronal populations. Targeting in this way allows population signals to be recorded and interpreted without blindness to neuronal diversity. Here, we evaluated the voltage‐sensitive fluorescent protein, VSFP Butterfly 2.1, a genetically encoded voltage indicator ( GEVI ), for monitoring electrical activity of layer 2/3 cortical pyramidal neurons in mouse brain slices. Standard widefield fluorescence and two‐photon imaging revealed robust, high signal‐to‐noise ratio read‐outs of membrane voltage transients that are predominantly synaptic in nature and can be resolved as discrete areas of synaptically connected layer 2/3 neurons. We find that targeted expression of this GEVI in the cortex provides a flexible and promising tool for the analysis of L2/3 cortical network function.