Multi-Label Nucleotide Composition for Stable Sequencing Signals
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Solution Overview
Problem
Existing sequencing technologies face challenges in accurately distinguishing between different luminescently labeled molecules due to label-label interactions that attenuate detectable signals, necessitating complex instrumental setups and large instrument sizes.
Innovation Solution
The development of luminescently labeled nucleotides with two or more labels separated by a linker, such as a nucleic acid or peptide, to maintain consistent emission characteristics and reduce label interactions, allowing for compact sequencing systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple luminescent labels are placed close together on a reaction component, then the brightness signal is enhanced, but label-label interactions cause signal attenuation and inconsistent emission lifetimes
Solution Approach 1:
A linker molecule serves as an intermediary between multiple luminescent labels, physically separating them to prevent harmful label-label interactions while maintaining their collective brightness enhancement function
Solution Approach 2:
The labeling structure is segmented into distinct components (luminescent labels, linkers, and spacers) that can be independently optimized, allowing separation of labels to prevent interactions while maintaining signal intensity
2Measurement precision
If complex optical filtering systems are used to detect single molecules, then measurement precision is improved, but device complexity and instrument size increase
Solution Approach 1:
Different nucleotide types are labeled with luminescent labels having distinct emission spectra (different colors), enabling identification based on luminescent properties without complex filtering systems
Solution Approach 2:
The detection system exploits changes in luminescent parameters (emission wavelength, lifetime) to distinguish between different nucleotide incorporations, reducing reliance on complex optical filtering
3Illumination intensity
If luminescent labels are placed too close together, then the overall signal intensity increases, but the emission lifetime becomes inconsistent and detectable
Solution Approach 1:
The linker acts as a mediator that maintains optimal spacing between luminescent labels, ensuring both sufficient proximity for signal enhancement and adequate separation for consistent emission lifetime
Solution Approach 2:
The linker length and properties are optimized to control the spatial arrangement of labels, adjusting parameters to achieve the balance between signal intensity and emission lifetime consistency
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 approach enhances signal brightness and consistency, reducing the need for bulky optical filters and enabling more efficient, miniaturized sequencing instruments.
Implementation Method 1
The labels are illuminated with a light source to cause luminescence, and the luminescent light is detected with a photodetector
Data Source
AI summary
Compositions useful for the detection of single molecules in a sample are provided. In some aspects, the disclosure provides a nucleic acid connected to a nucleotide and two or more luminescent labels. In some embodiments, the nucleic acids described herein comprise one or more structural features that provide enhanced fluorescence intensity. In some aspects, methods of sequencing using the labeled nucleotides of the disclosure are provided.