DNA Microarray Probe Design for SNP Detection
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Solution Overview
Problem
The existing DArT method for detecting mutations using DNA microarrays has a limited detection ability, failing to detect small mutations like SNPs unless they occur within restriction enzyme recognition sites or involve deletions of several hundred base pairs.
Innovation Solution
A method for designing probes with enhanced sensitivity by specifying and sequencing regions flanked by restriction enzyme recognition sites, allowing for the creation of a DNA microarray that can detect small mutations by hybridizing amplified genomic DNA fragments with immobilized probes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If genomic DNA fragments are used as probes in the DArT method, then the method can analyze genomic diversity, but the detection ability for small mutations like SNPs is insufficient
Solution Approach 1:
The probe is segmented into two functional parts: a restriction enzyme recognition site sequence and a genomic DNA-specific sequence. This segmentation allows the probe to maintain high specificity for detecting small mutations while preserving the ability to be generated through restriction enzyme digestion, thereby resolving the contradiction between detection precision and reliability
Solution Approach 2:
The probe design applies local quality by concentrating the mutation-detection function in the genomic DNA-specific sequence portion while the restriction enzyme recognition site provides the structural framework for generation. This localized functional differentiation enables high sensitivity for small mutations without requiring the entire probe structure to be optimized for each specific mutation type
2Measurement precision
If the probe length is long (genomic DNA fragment size), then the probe can represent genomic diversity, but the hybridization specificity for detecting small mutations decreases
Solution Approach 1:
The probe is divided into a restriction enzyme recognition site sequence and a genomic DNA-specific sequence, where the genomic DNA-specific sequence portion is optimized for length to balance hybridization specificity and genomic representation. This segmentation allows the critical detection region to be sufficiently short for specificity while the overall structure maintains diversity representation capabilities
Solution Approach 2:
The probe length parameter is optimized by specifying that the genomic DNA-specific sequence portion should be shorter than the original genomic DNA fragment. This parameter change improves hybridization specificity for detecting small mutations while the restriction enzyme recognition site portion maintains the ability to represent genomic diversity through various digestion patterns
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 enables accurate detection and identification of mutations at the genotype level, improving the detection rate of polymorphisms in genomic DNA, including SNPs, and reducing pseudo-positive reactions.
Implementation Method 1
digesting the genomic DNA with a restriction enzyme having the same recognition sequence as the restriction enzyme used in the method for designing probes
Implementation Method 2
connecting an adaptor to the genomic DNA fragments obtained by the restriction enzyme treatment
Implementation Method 3
amplifying the genomic DNA fragments using a primer capable of hybridizing to the adaptor
Implementation Method 4
detecting a hybrid of the genomic DNA fragment with the probes by bringing the amplified genomic DNA fragment into contact with a DNA microarray
Data Source
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AI summary
Provided is a probe to be used in a DNA microarray having an excellent detection rate of a polymorphism such as SNP contained in genomic DNA. A method for designing a probe according to the invention includes the steps of: specifying one or more regions covering at least a part of fragments flanked by restriction enzyme recognition sites recognized by a restriction enzyme, contained in genomic DNA derived from an organism to be tested; and designing a probe for the specified one or more regions for detecting the fragment in the organism to be tested.