Genotyping by Polymerase Binding for SNP Detection
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Solution Overview
Problem
Current methods for detecting single nucleotide polymorphisms (SNPs) and other nucleic acid polymorphisms are costly and time-consuming, making it difficult to scale them for clinically meaningful levels, especially when evaluating large SNP panels in populations.
Innovation Solution
A polymerase-based method that forms stabilized ternary complexes on an array, using allele-specific or locus-specific primers and cognate nucleotides to selectively identify target alleles by forming specific complexes that distinguish between target and non-target alleles, even when they differ by only a single nucleotide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current methods are used to detect SNPs and nucleic acid polymorphisms, then diagnostic accuracy can be achieved, but the methods are costly and time-consuming
Solution Approach 1:
The method segments the SNP detection process into two distinct phases: (1) formation of ternary complexes with allele-specific primers and cognate nucleotides on array features, and (2) detection of stabilized complexes. This segmentation allows parallel processing of multiple SNPs simultaneously, reducing overall detection time while maintaining diagnostic accuracy through the specific biochemical interactions in each phase.
Solution Approach 2:
The patent introduces ternary complexes as intermediary structures that form between allele-specific primers, cognate nucleotides, and template DNA. These stabilized ternary complexes serve as detectable intermediaries that bridge the gap between the initial hybridization event and the final detection signal, enabling accurate SNP identification without requiring time-consuming sequential analysis of each potential SNP.
2Adaptability or versatility
If current methods are used to evaluate large SNP panels, then comprehensive genetic analysis can be achieved, but the methods are costly and difficult to scale
Solution Approach 1:
The method employs a universal array platform that can simultaneously detect multiple SNPs across different loci using the same basic biochemical principles. The array features can be configured with different allele-specific primers targeting various SNPs, allowing a single system to perform comprehensive genetic analysis of large SNP panels without requiring separate specialized assays for each SNP, thereby reducing costs and improving scalability.
Solution Approach 2:
The patent uses multiple copies of allele-specific primers attached to array features to detect corresponding SNPs in the sample. This copying approach allows parallel detection of numerous SNPs simultaneously, where each array feature contains sufficient primer copies to detect the target allele, enabling comprehensive genetic analysis to be performed in a single experiment rather than requiring multiple separate analyses.
3Measurement precision
If allele-specific primers are used to distinguish target alleles, then detection specificity can be improved, but the complexity of the detection system increases
Solution Approach 1:
The method applies local quality by making the primers themselves allele-specific through careful design of their nucleotide sequences. Each allele-specific primer is designed to be complementary only to its target allele sequence, creating local specificity at the primer-template interface. This approach achieves high detection specificity without requiring complex detection instrumentation, as the specificity is embedded in the molecular design of the primers rather than in the complexity of the detection system.
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 method allows for efficient and accurate identification of target alleles in a mixture of nucleic acids, enabling the detection of rare variants and improving the speed and cost-effectiveness of genetic diagnostics by leveraging the specificity of polymerase-nucleotide interactions.
Implementation Method 1
forming a plurality of stabilized ternary complexes at a plurality of features on an array, wherein the stabilized ternary complexes each has a polymerase, a template nucleic acid having a target allele of a locus, a primer hybridized to the locus, and a next correct nucleotide having a cognate in the locus
Implementation Method 2
a primer hybridized to the locus, wherein either (i) the primer is an allele-specific primer having a 3′ nucleotide that is a cognate nucleotide for the target allele
Data Source
AI summary
A method for identifying target alleles, that includes steps of (a) forming a plurality of stabilized ternary complexes at a plurality of features on an array, wherein the stabilized ternary complexes each has a polymerase, a template nucleic acid having a target allele of a locus, a primer hybridized to the locus, and a next correct nucleotide having a cognate in the locus, wherein either (i) the primer is an allele-specific primer having a 3′ nucleotide that is a cognate nucleotide for the target allele, or (ii) the primer is a locus-specific primer and the next correct nucleotide hybridizes to the target allele; and (b) detecting stabilized ternary complexes at the features, thereby identifying the target alleles.