Exocyclic Amine Coumarin Dyes for Blue Excitation Sequencing
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Solution Overview
Problem
Current nucleic acid sequencing methods face challenges with the limited availability of blue fluorescent dyes suitable for high-density detection under blue light excitation, which hinders the resolution and accuracy of sequencing due to the scarcity of dyes with strong fluorescence properties compatible with bio-labeling applications.
Innovation Solution
Development of exocyclic amine-substituted coumarin derivatives that absorb light optimally at 450-460 nm, enabling improved fluorescence detection and resolution when used as nucleotide labels, particularly in conjunction with blue wavelength excitation sources, and can be conjugated with nucleotides or other substrates for enhanced sequencing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If blue fluorescent dyes are used for high-density detection under blue light excitation, then resolution and accuracy of sequencing improve, but availability of suitable dyes is limited
Solution Approach 1:
The patent modifies the chemical structure of coumarin dyes by introducing exocyclic amine substitutions and adjusting substituents at positions 3, 4, and 7 of the coumarin ring system. These structural parameter changes optimize the dyes' absorption and emission spectra to achieve strong fluorescence under blue light excitation (450-460 nm), thereby increasing the availability of suitable blue fluorescent dyes for high-density sequencing detection.
2Adaptability or versatility
If multiple spectrally-distinguishable fluorescent labels are used for multiplex detection, then independent detection of multiple analytes improves, but finding dyes with suitably-resolved spectra becomes more difficult
Solution Approach 1:
The patent introduces different substituent groups at specific positions (3, 4, and 7) of the coumarin ring system to create dyes with locally optimized spectral properties. By varying substituents such as halogens, cyano groups, carboxyl groups, and alkyl groups at these specific positions, the patent generates a series of dyes with finely tuned absorption and emission spectra, enabling spectrally-resolved multiplex detection.
Solution Approach 2:
The patent systematically varies chemical parameters including the type of substituent groups, their positions on the coumarin ring, and the presence of exocyclic amine groups to create a library of dyes with distinct spectral characteristics. This parameter optimization enables the development of multiple dyes that can be simultaneously excited by blue light but emit at distinguishable wavelengths for multiplex detection.
3Illumination intensity
If high power light sources like lasers are used for excitation, then fluorescence signal intensity improves, but photo-stability requirements of dyes increase
Solution Approach 1:
The patent optimizes the chemical structure of coumarin dyes by introducing electron-donating exocyclic amine groups and carefully selecting substituents that enhance the dye's resistance to photodegradation. These structural modifications improve the HOMO-LUMO energy gap and stabilize the excited state, allowing the dyes to withstand high-power laser excitation without rapid degradation, thus maintaining both strong signal intensity and photo-stability.
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 compounds enhance the length, intensity, and accuracy of sequencing reads by providing strong fluorescence signals under blue light excitation, improving the density and quality of sequencing data while being compatible with bio-labeling and sequencing chemistries.
Implementation Method 1
exocyclic amine-substituted coumarin derivatives that absorb light optimally at 450-460 nm, enabling improved fluorescence detection
Implementation Method 2
absorb light optimally at 450-460 nm
Data Source
AI summary
The present application relates to exocyclic amine-substituted coumarin derivatives and their uses as fluorescent labels. These compounds may be used as fluorescent labels for nucleotides in nucleic acid sequencing applications.