Polymethine Dye Structural Tuning for Multiplex Sequencing
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Solution Overview
Problem
Current fluorescent markers for nucleic acid sequencing face challenges in achieving spectrally distinguishable emission, equal excitation efficiency, and compatibility with reagents, particularly in multiplex detection methods, which limits their effectiveness in high-throughput sequencing applications.
Innovation Solution
Development of novel polymethine dye compounds with specific structural features, such as varying Ra and Rc groups, and linker moieties for conjugation to nucleotides, enabling improved fluorescence properties and compatibility with sequencing reagents, allowing for efficient nucleotide incorporation and multiplex detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple fluorescent dyes are used together for multiplex detection, then the number of reaction vessels is reduced and throughput is increased, but it becomes difficult to find dye compounds with suitably spectrally resolved emission spectra and equal excitation efficiency
Solution Approach 1:
The patent modifies the chemical structure of polymethine dye compounds by varying substituents at specific positions (Ra, Rc, Rd groups) to systematically tune absorption and emission spectra. This structural parameter optimization enables selection of dyes with spectrally resolved emission and overlapping absorption bands, resolving the contradiction between multiplex capability and spectral distinguishability.
Solution Approach 2:
The patent introduces different substituent groups at specific local positions on the polymethine dye structure (positions Ra, Rc, Rd) to create dyes with tailored spectral properties. This local structural modification allows precise control over absorption and emission characteristics, enabling multiple dyes to be excited by a single laser while maintaining spectral resolution.
2Illumination intensity
If high power light sources like lasers are used for excitation, then fluorescence signals can be generated, but the dye must have sufficient photo-stability to withstand such excitation
Solution Approach 1:
The patent designs composite polymethine dye structures combining specific heterocyclic rings (indole, benzindole, carbazole) with tailored substituent patterns. This composite molecular architecture enhances photo-stability while maintaining high fluorescence quantum yield, allowing the dyes to withstand high power laser excitation without rapid degradation.
Solution Approach 2:
The patent develops dyes with improved photo-stability that can endure repeated laser excitation cycles, effectively extending their operational lifetime in high-throughput sequencing applications. This reduces the need for frequent dye replacement and maintains consistent signal quality over extended measurement periods.
3Measurement precision
If fluorescent dyes are optimized for fluorescence intensity and spectral properties, then sequencing speed and accuracy improve, but compatibility with reagent chemistries (DNA synthesis solvents, buffers, enzymes) must be maintained
Solution Approach 1:
The patent modifies chemical parameters of the polymethine dye structure, specifically introducing water-soluble substituents (sulfonate groups, carboxylates, quaternary ammonium salts) to enhance compatibility with aqueous reagent systems. These parameter changes maintain spectral optimization while ensuring solubility and compatibility with DNA synthesis buffers and enzymes.
Solution Approach 2:
The patent introduces linker groups as intermediary structures connecting the polymethine chromophore to the nucleotide base. These linkers serve as mediators that maintain the dye's spectral properties while ensuring compatibility with enzymatic recognition and DNA synthesis chemistry, bridging the gap between optical optimization and biochemical functionality.
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 new polymethine dye compounds enhance fluorescence intensity and spectral distinguishability, improving the speed and accuracy of nucleic acid sequencing, reducing sequencing errors, and minimizing reagent usage.
Implementation Method 1
fluorescence signals
Implementation Method 2
excitation efficiency
Data Source
AI summary
The present disclosure relates to new polymethine compounds and their use as fluorescent labels. The compounds may be used as fluorescent labels for nucleotides in nucleic acid sequencing applications.