Primary Template-Directed Amplification for Single-Cell Genomic Analysis
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Solution Overview
Problem
Current methods for nucleic acid amplification and sequencing face challenges in isolating single cells, obtaining sufficient genomic material, achieving high and uniform genomic coverage, and minimizing amplification artifacts such as allelic bias, mutations, and chimeras, especially when dealing with small sample quantities.
Innovation Solution
The implementation of Primary Template-Directed Amplification (PTA) provides a scalable and accurate method for spatial nucleic acid analysis, allowing for the isolation and amplification of single cells with high uniformity and completeness, using terminator nucleotides and strand displacement polymerases to generate unbiased, multiomics data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional nucleic acid amplification methods are used on single cells, then amplification of genomic material is achieved, but amplification artifacts such as allelic bias, mutations, and chimeras occur
Solution Approach 1:
The patent employs Multiple Displacement Amplification (MDA) with specific parameter optimizations including using phi29 DNA polymerase at 30°C for extended periods (12-18 hours), controlling dNTP concentrations, and adjusting primer concentrations to minimize amplification artifacts while maximizing genomic material yield from single cells
Solution Approach 2:
The patent introduces unique molecular identifiers (UMIs) as intermediary sequences that are incorporated during amplification to track and correct for amplification biases. These UMIs serve as mediators that allow computational correction of allelic bias and other artifacts during data analysis
2Measurement precision
If single cells are isolated for analysis, then cellular heterogeneity can be studied, but sufficient genomic material for sequencing is not obtained
Solution Approach 1:
The patent performs preliminary whole-genome amplification using MDA before sequencing to generate sufficient genomic material from single cells. This preliminary amplification step creates multiple copies of the genomic DNA, providing enough material for subsequent sequencing operations while maintaining single-cell resolution
Solution Approach 2:
The patent optimizes MDA reaction parameters including extending incubation time to 12-18 hours, controlling polymerase activity, and adjusting template concentrations to maximize DNA yield from single cells while maintaining genome coverage and uniformity
3Productivity
If high-throughput analysis methods are implemented, then productivity increases, but accuracy and uniformity of genomic coverage decrease
Solution Approach 1:
The patent segments the amplification process into controlled MDA reactions for individual cells, with each cell's DNA amplified separately in isolated micro反应 vessels. This segmentation allows high-throughput processing of many cells while maintaining uniform coverage and quality control for each individual amplification reaction
Solution Approach 2:
The patent incorporates quality control metrics and computational methods that provide feedback on amplification quality, including assessment of genome coverage uniformity, detection of amplification artifacts, and adjustment of sequencing depth requirements based on individual sample quality
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
PTA enables the generation of high-quality genomic and transcriptomic data from single cells with reduced errors and biases, enabling detailed analysis of cellular heterogeneity and tumor evolution, and improving the detection of mutations and copy number variations.
Implementation Method 1
amplifying the nucleic acids to generate a plurality of amplicons
Implementation Method 2
wherein the replication proceeds by strand displacement replication
Implementation Method 3
at least one terminator nucleotide which terminates nucleic acid replication by the polymerase
Data Source
AI summary
Provided herein are compositions and methods for high-throughput Primary Template-Directed Amplification (PTA) nucleic acid amplification and sequencing method, and their applications for mutational analysis in research, diagnostics, and treatment. Further provided herein are methods for spatial analysis of single cells from samples.