Meta-stable Oligos for In Situ SNP Detection
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Solution Overview
Problem
Current fluorescent in situ hybridization (FISH) assays face challenges in specificity and sensitivity, particularly for analyzing short sequences like single nucleotide polymorphisms (SNPs) or point mutations, due to low signal intensity and high noise levels, and are often labor-intensive and error-prone.
Innovation Solution
The use of meta-stable oligonucleotides that hybridize to target nucleic acids for a short period, allowing for proximity ligation and subsequent amplification to enhance stability and detection of specific sequences, employing circular or padlock probes, primers, and anchors to form hybridization complexes and amplify target regions of interest.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If FISH assays are used for analyzing short sequences like SNPs, then the ability to detect nucleic acids without amplification is maintained, but the signal intensity is low and signal-to-noise ratio is poor
Solution Approach 1:
The method performs preliminary nucleic acid amplification (via PCR, rolling circle amplification, or other amplification techniques) before conducting FISH assay. This preliminary action generates sufficient target copies to produce strong fluorescent signals, resolving the contradiction between maintaining non-amplification detection capability and achieving adequate signal intensity for reliable SNP detection.
2Ease of manufacture
If traditional FISH assays are used for SNP genotyping, then the simplicity of the assay is maintained, but the specificity and sensitivity are insufficient
Solution Approach 1:
The method introduces locally differentiated probe designs with specific sequence characteristics optimized for SNP detection. Probes are designed with unique features at the SNP position (such as mismatch positioning, probe length variations, or fluorescent labeling patterns) that provide local discrimination capability, enabling precise SNP genotyping while maintaining the overall simplicity of the FISH assay framework.
3Reliability
If FISH assays are applied to short sequence analysis, then the non-amplification detection advantage is preserved, but the ability to distinguish single bases is limited
Solution Approach 1:
The detection system is segmented into multiple specialized probes, each targeting specific aspects of the SNP. This includes separate probes for different alleles, or probes with different fluorescent labels that bind to specific base configurations. The segmentation allows each probe to be optimized for its specific function, achieving high single-base discrimination precision while maintaining reliable detection through the combined signal from multiple probes.
4Ease of operation
If conventional methods are used for in situ SNP analysis, then the workflow is straightforward, but the process is labor-intensive and error-prone
Solution Approach 1:
The method merges multiple operations into a single integrated workflow: amplification and FISH hybridization are combined in one protocol, and SNP detection is integrated with the hybridization step itself through allele-specific probe design. This merging eliminates separate manual steps for each operation, reducing labor intensity and minimizing opportunities for errors while maintaining ease of operation through a unified procedure.
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 enables precise detection and amplification of single nucleotide polymorphisms in situ, improving specificity and sensitivity, reducing labor and error, and allowing for high-throughput analysis of nucleic acid sequences in biological samples.
Implementation Method 1
one or more ligation reactions (e.g., proximity ligation) in a hybridization complex comprising one or more short, meta-stable oligos hybridized to a target nucleic acid
Data Source
AI summary
The present disclosure relates in some aspects to methods for analyzing a target nucleic acid in a biological sample. In some aspects, the methods involve the use of a set of probe polynucleotides, for example a set of three or more probe polynucleotides, for assessing target nucleic acids. In some aspects, the presence, amount, and/or identity of region of interest in a target nucleic acid is analyzed in situ. Also provided are polynucleotides, sets of polynucleotides, compositions, and kits for use in accordance with the methods.