Genomic Variation Tags for Fine Structural Variation Detection
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Solution Overview
Problem
Current methods for analyzing fine structural variations in nucleic acids, such as array comparative genomic hybridization and fosmid paired-end mapping, are inefficient and costly, limiting their use in broad population surveys and cohort studies, especially for identifying genomic variations associated with complex diseases or environmental factors.
Innovation Solution
The development of Genomic Variation Tags (GVTs) that are pairs of short sequence tags with a user-defined separation distance, serving as markers for adjacent restriction endonuclease sites, allowing for high-throughput identification of fine structural differences by aligning them computationally onto a reference sequence, and enabling the creation of high-resolution genomic maps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If array comparative genomic hybridization is used to analyze fine structural variations, then copy number differences can be detected, but the method is not suited for identifying inversions, translocations and other nucleic acid rearrangements
Solution Approach 1:
The patent segments the target nucleic acid into multiple fragments and uses multiple different nucleic acid probes to hybridize with different regions. This segmentation allows the method to detect various types of structural variations including copy number changes, inversions, and translocations, thereby resolving the limitation of array CGH that could only detect copy number differences.
2Adaptability or versatility
If fosmid paired-end mapping is used to identify structural variations, then inversions and translocations can be detected, but the method is inefficient and costly for broad population surveys
Solution Approach 1:
The patent uses nucleic acid amplification techniques to generate multiple copies of target regions before hybridization. This copying approach enables high-throughput analysis of multiple samples simultaneously, making the method cost-effective and efficient for broad population surveys while maintaining the capability to detect inversions and translocations.
Solution Approach 2:
The patent employs a universal probe set that can detect multiple types of structural variations (copy number changes, inversions, translocations) across different samples. This multi-functional approach allows a single methodology to serve diverse detection needs, enabling efficient population-scale studies without requiring separate methods for each variation type.
3Measurement precision
If high-density oligonucleotide array platforms are used, then resolution for copy number detection is improved, but the method remains unsuitable for detecting other types of genomic structural variations
Solution Approach 1:
The patent segments the genome into multiple target regions and uses a panel of different nucleic acid probes to hybridize with these regions. This segmentation strategy maintains high resolution for copy number detection while simultaneously enabling the detection of inversions, translocations, and other structural variations, thus achieving both high precision and broad detection scope.
Solution Approach 2:
The patent changes the parameters of the hybridization assay by using multiple different probes with varying specificities and conditions. This allows the same high-density oligonucleotide array platform to detect multiple types of structural variations by adjusting probe design and hybridization parameters, thereby maintaining high resolution while expanding detection scope.
Data Source
AI summary
The invention disclosed herein describes methods for the mapping and identification of fine-structural variations in nucleic acids.