Three-Channel Fluorescence Scanner for FRET Correction
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Solution Overview
Problem
Two-color fluorescence microarray measurements are distorted by fluorescence resonance energy transfer (FRET) and cross-talk due to spectral overlap and close proximity of fluorophores, leading to inaccurate quantification of fluorophore intensities.
Innovation Solution
A three-channel fluorescence scanner is used to measure fluorescence emissions, with specific channels observing donor, acceptor, and sensitized emissions, allowing for the calculation of correction factors to account for FRET and cross-talk effects, ensuring accurate intensity measurements of both fluorophores.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two-color fluorescence measurement is performed with conventional two-channel scanner, then measurement speed and simplicity are maintained, but measurement precision deteriorates due to FRET and cross-talk distortions
Solution Approach 1:
The fluorescence detection is segmented into three distinct channels: donor channel for direct donor emission, acceptor channel for direct acceptor emission, and FRET channel for sensitized acceptor emission. This segmentation allows separate measurement of FRET signal and direct acceptor signal, enabling accurate correction of FRET distortion in two-color measurements.
Solution Approach 2:
The FRET channel acts as an intermediary measurement that captures the sensitized emission from acceptor fluorophores excited by donor excitation. This intermediate measurement provides the basis for calculating correction factors that account for FRET effects, which are then applied to improve the accuracy of the two-color intensity ratio measurement.
2Measurement precision
If FRET correction is applied to improve measurement accuracy, then measurement precision improves, but device complexity increases due to additional measurement channels
Solution Approach 1:
The FRET channel measurement is performed as a preliminary step to obtain the sensitized emission signal before calculating the correction factor. This preliminary measurement of FRET signal allows the system to pre-calculate the correction factor that will be applied to the donor and acceptor channel signals, ensuring accurate intensity ratio determination.
Solution Approach 2:
The system uses the FRET channel signal as feedback to calculate a correction factor that is then applied to correct the donor and acceptor channel measurements. This feedback mechanism ensures that FRET distortion is compensated, improving the accuracy of the two-color fluorescence intensity ratio measurement.
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 method provides reliable and accurate fluorescence intensity measurements by correcting for distortions caused by FRET and cross-talk, enabling precise data analysis in two-color microarray experiments.
Implementation Method 1
a first fluorescence observation channel that provides excitation at a wavelength adapted for a first fluorophore, and a detector configured to detect the fluorescence wavelength of the first fluorophore
Implementation Method 2
Two-color fluorescence microarray measurements are distorted by fluorescence resonance energy transfer (FRET) and cross-talk due to spectral overlap and close proximity of fluorophores
Data Source
AI summary
Methods and devices use in two-color measurement systems. The methods and devices include methods of making corrections, methods of calculating correction factors, fluorescence scanners, and microarray chips. The said methods and devices enable a user to correct fluorescence intensities for errors caused by the occurrence of FRET and/or cross-talk when two fluorophores are used in two-color fluorescence arrays.