Temporally multiplexed imaging using photoswitchable proteins
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Solution Overview
Problem
Conventional fluorescence microscopy struggles to multiplex multiple signals in living cells, limiting the ability to determine interactions between different cellular signals, which is crucial for understanding cellular computation and disease states, and existing methods like signaling reporter islands require specific dynamic fluorescent indicators and exotic hardware.
Innovation Solution
The method involves expressing reversibly photoswitchable fluorescent proteins with independently selected temporal properties in cells, allowing for simultaneous imaging and linear unmixing of signals using standard linear algebra, enabling the separation and analysis of multiple cell activities without requiring additional hardware beyond standard microscopes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If spectral differences between fluorophores are used for multiplexed imaging, then multiple signals can be imaged simultaneously, but the number of signals is limited to a handful
Solution Approach 1:
The patent changes the parameter used for signal differentiation from spectral properties to temporal properties. By using fluorophores with different switching kinetics (temporal behavior) instead of relying on spectral differences, the system can resolve many more signals simultaneously without increasing spectral complexity.
Solution Approach 2:
The patent introduces dynamic temporal switching behavior as the basis for signal differentiation. Fluorophores are switched on and off at different rates, creating unique temporal signatures that allow computational separation of many signals. This dynamic approach replaces static spectral separation.
2Quantity of substance
If signaling reporter islands with self-assembling peptides are used, then large numbers of signals can be imaged, but exotic hardware is required
Solution Approach 1:
The patent uses computational methods to separate signals based on temporal patterns, creating a virtual separation without physical hardware separation. Standard linear algebra and unmixing algorithms process the temporal data to reconstruct individual signal images, replacing the need for exotic hardware.
Solution Approach 2:
The patent replaces physical/mechanical hardware-based signal separation with computational/mathematical processing. Instead of using specialized optical hardware to separate signals spatially or spectrally, the system uses software-based unmixing of temporal data from standard microscope hardware.
3Quantity of substance
If spatially multiplexed imaging is used to image signals separately, then many signals can be resolved, but space is consumed as a resource
Solution Approach 1:
The patent transitions from spatial multiplexing to temporal multiplexing, moving the differentiation dimension from space to time. By encoding signal identity in temporal switching patterns rather than spatial location, the system can resolve many signals within the same spatial field without consuming additional imaging space.
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
This approach allows for accurate, multiplexed imaging of various cellular activities, such as enzyme activities and cell cycle signals, by encoding information in time rather than spectrum, thereby overcoming the limitations of conventional methods and enabling the observation of many signals at once.
Implementation Method 1
expressing reversibly photoswitchable fluorescent proteins with independently selected temporal properties in cells
Implementation Method 2
Fluorescence microscopy is important for measuring the temporal dynamics of cellular signals
Data Source
AI summary
The invention, in some aspects, include methods and systems for temporally multiplexed imaging (TMI).