Optogenetic Imager Calibration for Accurate Inter-Well Normalization
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Solution Overview
Problem
Existing plate imagers and electrophysiology methods suffer from issues such as membrane damage, limited temporal resolution, non-uniform electrical stimulation, and high costs, which hinder accurate assessment of cellular activity and drug screening.
Innovation Solution
An optical multi-well plate reader with independent optical channels and calibration methods to normalize signals across wells, using optogenetic techniques to stimulate and detect cellular activity, providing high-throughput screening and accurate inter-well comparisons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If physical electrodes are used for stimulation and recording in automated electrophysiology, then electrical activity of cells can be measured, but cell membranes are damaged leading to intracellular dialysis and cell damage
Solution Approach 1:
The patent replaces physical electrodes with optical stimulation and detection methods. Light-sensitive actuators (optogenetic tools) are used to stimulate cells optically, and light-sensitive reporters are used to detect cellular responses, eliminating the need for physical electrode contact with cell membranes.
Solution Approach 2:
The patent introduces light as an intermediary medium between the stimulation source and the cell. Optical signals mediate the stimulation and detection processes, allowing non-invasive interaction with cells through light-sensitive proteins rather than direct physical contact.
2Measurement precision
If automated electrophysiology instruments are used, then electrical activity can be assessed, but specialized assay plates are required leading to high costs
Solution Approach 1:
The patent enables standard multi-well plates to serve multiple purposes: they can hold cells for optogenetic assays, accommodate various reagents, and be used in conventional plate readers. This multi-functionality eliminates the need for specialized expensive plates while maintaining assay capabilities.
Solution Approach 2:
The patent uses optical signals as copies or proxies for electrical measurements. Instead of directly measuring electrical properties requiring specialized equipment and plates, the system uses optical reporters that copy cellular electrical activity into detectable light signals.
3Measurement precision
If chemical stimuli are used to activate voltage-gated channels in FLIPR methods, then cellular activity can be measured, but the stimuli may not reflect physiological processes altering pharmacological responses
Solution Approach 1:
The patent replaces chemical stimulation with optical stimulation using light-sensitive actuators. This substitution allows physiological relevance to be maintained because light can precisely control the timing and intensity of channel activation without introducing non-physiological chemical compounds.
4Quantity of substance
If FLIPR-type instruments are used for kinetic measurements, then cellular channel activity can be monitored, but temporal resolution is insufficient to record important ion channel functions
Solution Approach 1:
The patent uses rapid periodic optical stimulation and detection to capture fast cellular events. The light-based system can be pulsed at high frequencies, enabling temporal resolution sufficient to record rapid ion channel functions and fast cellular responses.
5Measurement precision
If electrical field stimulation with fluorescent readout is used, then cellular activity can be measured, but voltage control is limited and field nonuniformities cause overstimulation or electroporation
Solution Approach 1:
The patent applies local optical stimulation to individual wells or even individual cells using focused light sources. This allows precise control of stimulation intensity and location, avoiding the nonuniform field problems of electrical stimulation while maintaining the ability to measure cellular responses.
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
Enables precise, high-throughput optogenetic assays that correct for inherent variability, allowing accurate prediction of in vivo cellular activity and phenotypic characterization, overcoming limitations of existing technologies.
Implementation Method 1
optical reporters of cellular activity... transmit excitation light... and detect emission light from the optical reporters
Implementation Method 2
optical actuators of cellular activity... transmit stimulation light... to produce a cellular activity
Data Source
AI summary
The present invention includes methods and systems for optical assays, such as optogenetic assays, of biological activity in which an optical reference signal is used to normalize an optical test signal.