Noble Metal Nanoparticle-Enhanced Raman Sequencing
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Solution Overview
Problem
Current high-throughput DNA sequencing technologies face challenges such as high costs, biased coverage of GC-rich or AT-rich genomes, inability to accurately sequence homopolymer stretches, difficulty in sequencing RNA, and limited throughput, which hinder their adoption in clinical and research applications.
Innovation Solution
The integration of noble metal nanoparticles with nucleotide polymerase as surface-enhanced Raman spectroscopy (SERS) substrates, enabling enhanced Raman detection for accurate and sensitive sequencing by synthesis (SBS) methods, including ensemble and single-molecule sequencing approaches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fluorescent detection methods are used in sequencing by synthesis, then detection sensitivity is improved, but device complexity and cost increase due to expensive cameras and imaging tools
Solution Approach 1:
The patent replaces the mechanical/optical imaging system (cameras and imaging tools) with a Raman spectroscopy-based detection system. Instead of using fluorescent labels that require complex imaging equipment, the invention uses Raman-active nucleotide analogues that can be detected through Raman spectroscopy, which uses laser excitation and spectral analysis rather than complex camera systems. This substitution maintains detection sensitivity while reducing device complexity.
2Device complexity
If Raman detection is used for DNA sequencing, then device complexity is reduced, but measurement precision deteriorates due to weak Raman signals
Solution Approach 1:
The patent attaches noble metal nanoparticles (such as gold or silver) to the nucleotide analogues at specific locations. These nanoparticles create localized surface plasmon resonance that enhances the Raman signal of the attached Raman-active groups. This local enhancement at the nanoparticle-nucleotide interface dramatically increases the Raman signal intensity, making detection sensitive enough for sequencing applications while maintaining the simplicity of the Raman detection system.
3Productivity
If conventional sequencing methods are used, then throughput is improved, but manufacturing precision deteriorates due to biased coverage of GC-rich or AT-rich genomes
Solution Approach 1:
The patent uses Raman spectroscopy detection with noble metal nanoparticle enhancement, which provides a different physical detection mechanism compared to conventional fluorescent methods. This change in detection parameters (from fluorescence intensity to Raman spectral fingerprinting) eliminates the biases associated with GC-rich or AT-rich regions, as Raman detection is not affected by the same optical absorption and quenching issues that plague fluorescent methods in certain genomic regions.
4Ease of manufacture
If sequencing by synthesis is performed without noble metal nanoparticles, then ease of manufacture is improved, but measurement precision deteriorates due to insufficient Raman signal enhancement
Solution Approach 1:
The patent creates a composite structure by attaching noble metal nanoparticles to Raman-active nucleotide analogues. This composite material combines the Raman-active chemical groups (for spectral identification) with the plasmonic noble metal nanoparticles (for signal enhancement). The composite structure provides synergistic effects where the nanoparticle enhances the Raman signal of the attached molecule, achieving high detection sensitivity while remaining manufacturable through established conjugation chemistry.
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 significantly improves sequencing accuracy and sensitivity, allowing for cost-effective, high-throughput DNA sequencing, including RNA, with enhanced ability to sequence challenging regions, and enables real-time single-molecule analysis.
Implementation Method 1
The integration of noble metal nanoparticles with nucleotide polymerase as surface-enhanced Raman spectroscopy (SERS) substrates, enabling enhanced Raman detection for accurate and sensitive sequencing by synthesis (SBS) methods
Data Source
AI summary
This invention provides nucleoside polyphosphate analogues each of which comprises a tag comprising a plurality of Raman-scattering moieties; compounds comprising said nucleoside polyphosphate analogs. This invention also provides nucleotide polymerases with one or more attached and/or conjugated noble metal nanoparticles, wherein the noble metal nanoparticles are surface-enhanced Raman spectroscopy (SERS) substrates thereby creating a region of enhanced sensitivity for surface enhanced Raman spectroscopy (SERS) within or adjacent to the polymerase. This invention also provides a surface with regions of enhanced sensitivity for surface enhanced Raman spectroscopy comprising interspersed rough or nanostructured noble metal surface. This invention also provides methods for determining the sequence of a single stranded DNA or RNA polynucleotide using one or more of nucleoside polyphosphate analogues, polymerase with noble metal nanoparticles, and surface with noble metal.