Rhodamine Dye Structural Tuning for Sequencing Multiplexing
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Solution Overview
Problem
Current fluorescent labels for nucleic acid sequencing face challenges in multiplex detection due to difficulties in finding dyes with suitably resolved emission spectra, photostability under high-power laser excitation, and compatibility with reagent chemistries, limiting throughput and accuracy in molecular biology methods.
Innovation Solution
Development of novel rhodamine dye compounds with specific structural modifications that enhance fluorescence intensity, stability, and spectral properties, allowing for improved conjugation with nucleotides and compatibility with nucleic acid sequencing reagents, enabling higher throughput and accuracy in 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 dyes with suitably resolved emission spectra and simultaneous excitation becomes difficult
Solution Approach 1:
The patent modifies the chemical structure of rhodamine dyes by introducing specific substituents (e.g., cyano groups, alkyl groups at defined positions) to alter their spectral parameters. This enables tuning of absorption and emission wavelengths to achieve both multiplex capability and spectral resolution. The structural modifications allow dyes to be excited at similar wavelengths while emitting at distinctly different wavelengths, resolving the contradiction between multiplex detection and spectral resolution.
2Power
If high power lasers are used for excitation, then excitation efficiency is improved, but the dye must have sufficient photostability to withstand such laser excitation
Solution Approach 1:
The patent introduces electron-withdrawing groups (such as cyano groups at positions 2 and 7 of the xanthene ring) and various substituents on the nitrogen atoms to modify the electronic structure of the rhodamine dye. These structural changes enhance the photostability of the dye molecules, enabling them to withstand high-power laser excitation without rapid degradation, while maintaining efficient excitation and fluorescence emission.
3Measurement precision
If fluorescent dyes are optimized for fluorescence intensity, then sequencing accuracy is improved, but compatibility with reagent chemistries such as DNA synthesis solvents and enzymes may be compromised
Solution Approach 1:
The patent introduces fluorescent dye molecules with specific local structural features - particularly substituent groups on the xanthene ring and nitrogen atoms - that are designed to provide both high fluorescence intensity and chemical compatibility. The substituents are positioned and selected to minimize interference with DNA synthesis enzymes and solvents while maintaining optimal fluorescent properties, thus achieving local optimization of both fluorescence performance and reagent compatibility.
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 rhodamine dye compounds provide higher fluorescence intensities and improved spectral distinguishability, leading to enhanced sequencing read lengths and accuracy, reducing errors and reagent usage, and are compatible with various nucleic acid sequencing methods.
Implementation Method 1
The compounds described herein are suitable for use as fluorescent labels
Data Source
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AI summary
The present invention relates to new rhodamine compounds and their use as fluorescent labels. The compounds may be used as fluorescent labels for nucleotides in nucleic acid sequencing applications.