Chemigenetic Voltage Indicators for Bright, Targeted Neuron Imaging
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Solution Overview
Problem
Current voltage indicators, both small-molecule dyes and genetically encoded indicators, face limitations in brightness and photostability, hindering precise in vivo imaging of neuronal activity.
Innovation Solution
Development of chemigenetic voltage indicators that combine membrane-localized voltage-sensitive proteins with capture proteins, such as microbial opsins and covalent capture proteins like HaloTag, to enhance brightness and photostability, allowing targeted voltage measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If small-molecule voltage indicator dyes are used, then brightness and fluorescence change are improved, but targetability to specific neurons deteriorates
Solution Approach 1:
The patent combines small-molecule voltage indicator dyes with genetically encoded targetable proteins (such as HaloTag, SNAP-tag, or CLIP-tag) to create a hybrid system. The small-molecule dye provides high brightness and fluorescence change, while the genetically encoded protein provides specific neuronal targeting capability. This merging allows the voltage indicator to simultaneously achieve both high brightness and cell-type-specific targeting.
2Adaptability or versatility
If protein-based indicators are used, then targetability is improved, but brightness and photostability deteriorate
Solution Approach 1:
The patent merges genetically encoded voltage-sensitive proteins (which provide targetability through genetic expression in specific neurons) with small-molecule fluorescent dyes (which provide high brightness and photostability). The genetically encoded protein component enables specific neuronal targeting while the small-molecule dye component delivers superior optical properties including higher brightness and enhanced photostability.
3Illumination intensity
If small-molecule dyes are used, then brightness is improved, but photostability deteriorates
Solution Approach 1:
The patent creates a hybrid voltage indicator system that combines small-molecule dyes (providing high brightness) with genetically encoded protein scaffolds (providing enhanced photostability). The protein component acts as a stable scaffold that reduces photobleaching of the attached small-molecule fluorophore, thereby improving overall photostability while maintaining the high brightness characteristics of the small-molecule dye.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The chemigenetic voltage indicators provide improved brightness and photostability, enabling clearer imaging of individual neurons and prolonged voltage measurement without irreversible photobleaching.
Implementation Method 1
determining changes in fluorescence of a small-molecule fluorescent dye captured by the capture protein
Implementation Method 2
the voltage indicator includes a membrane-localized voltage-sensitive protein coupled to a capture protein... arranged and disposed to capture small-molecule fluorescent dyes
Data Source
AI summary
Provided herein are a voltage indicator and a method of measuring voltage. The voltage indicator includes a membrane-localized voltage-sensitive protein coupled to a capture protein. The method of measuring voltage includes administering a voltage indicator including a membrane-localized voltage-sensitive protein coupled to a capture protein, and determining changes in fluorescence of a small-molecule fluorescent dye captured by the capture protein.