Fluorescent Dye Combinations for Multiplex PCR Spectral Separation
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Solution Overview
Problem
Current DNA sequencing and multiplex PCR technologies face limitations in sensitivity and spectral overlap due to restricted dye combinations and proprietary dyes, which hinder simultaneous detection of multiple nucleic acids, especially in instruments like the ABI Prism Genetic Analyzer.
Innovation Solution
The use of specific combinations of fluorescent dyes such as 5-FAM, DY-530, HEX, ATTO 550, DY-510XL, and optionally DY-632 or DY-520XL, covalently attached to nucleic acids, for enhanced sensitivity and reduced spectral overlap, allowing for the simultaneous detection of multiple nucleic acids in multiplex PCR reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If proprietary fluorescent dyes (VIC, NED, PET, LIZ) are used for multiplex PCR detection, then compatibility with ABI Prism instruments is achieved, but cost increases and availability is restricted
Solution Approach 1:
The patent changes the chemical parameters of the fluorescent dyes by selecting alternative dyes (6-FAM, JOE, TAMRA, ROX) with different spectral properties from the proprietary dyes. This allows compatibility with ABI Prism instruments through spectral calibration while avoiding proprietary restrictions and reducing costs.
Solution Approach 2:
The patent creates a universal dye combination that can be used across different ABI Prism instrument models (310, 3130, 3500, 3730) by implementing spectral calibration procedures. This universal combination replaces multiple proprietary dye options while maintaining instrument compatibility.
2Device complexity
If a single argon laser (488 nm excitation) is used for fluorescence detection, then instrument simplicity is maintained, but sensitivity dramatically declines between blue and red color channels
Solution Approach 1:
The patent changes the excitation wavelength parameter by selecting dyes that can be effectively excited at 488 nm (the argon laser wavelength). The chosen dyes (6-FAM, JOE, TAMRA, ROX) have absorption maxima that align well with this excitation source, optimizing sensitivity across all color channels while maintaining instrument simplicity.
Solution Approach 2:
The patent optimizes each color channel's detection sensitivity by carefully selecting dyes with appropriate spectral properties for their specific detection wavelengths. Each dye is chosen to maximize signal intensity in its respective color channel (blue, green, yellow, red) while minimizing interference from other channels.
3Productivity
If multiple fluorescent dyes are used for simultaneous detection of multiple nucleic acids, then multiplexing capability is achieved, but spectral overlap increases making detection difficult
Solution Approach 1:
The patent changes the spectral parameters by selecting dyes with well-separated emission spectra. The combination of 6-FAM (blue), JOE (green), TAMRA (yellow), and ROX (red) provides distinct emission peaks that minimize spectral overlap, enabling clear differentiation of multiple nucleic acid targets in multiplex PCR.
Solution Approach 2:
The patent segments the detection spectrum into distinct color channels (blue, green, yellow, red) by selecting dyes whose emission spectra are concentrated in these separate regions. This spectral segmentation allows simultaneous detection of multiple targets without significant interference between channels.
4Ease of operation
If proprietary dye combinations are used for DNA sequencing, then instrument calibration is simplified, but flexibility and customization are reduced
Solution Approach 1:
The patent creates a universal dye combination that works across multiple ABI Prism instrument models and applications (DNA sequencing, genotyping, multiplex PCR). The spectral calibration procedure makes this universal combination as easy to use as proprietary alternatives while providing greater flexibility in primer and probe design.
Solution Approach 2:
The patent changes the spectral parameters of the dye combination to optimize performance across different instrument models and applications. The selected dyes provide a balance of excitation efficiency at 488 nm, emission separation, and overall detection sensitivity that enhances versatility while maintaining ease of operation.
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
These dye combinations significantly improve sensitivity and flexibility in multiplex PCR, enabling the detection of multiple nucleic acids with reduced spectral overlap, enhancing the analytical capabilities in DNA sequencing and genotyping applications.
Implementation Method 1
Fluorescent dyes absorb light of a specific wavelength spectrum ('excitation spectrum') and re-emit energy at a different specific wavelength spectrum ('emission spectrum').
Implementation Method 2
Detection of the amplification products and their genotyping is usually carried out by multiple colour fluorescence detection after electrophorectic separation (e.g. capillary gel electrophoresis)
Data Source
Figure 1A~1E
Figure 2A~2B
Figure 3A~3D
AI summary
The present invention relates to combinations of fluorescent dyes used in molecular biology, particularly in multiplex PCR. In particular, the present invention relates to a combination of dyes for amplification reactions, wherein at least four different dyes are used, wherein the first dye is 5-FAM or 6-FAM or a blend thereof, the second dye is selected from the group consisting of DY-530, HEX, CAL Fluor Orange 560 and ATTO 532, the third dye is selected from the group consisting of ATTO 550, DY-555 and DY-556, the fourth dye is selected from the group consisting of ROX, DY-510XL and ATTO 565, and optionally a fifth dye is selected from the group consisting of DY-632 and DY-520XL.