Hairpin Chimeric Primers for Low-Background Multiplex Detection
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Solution Overview
Problem
Existing nucleic acid amplification and detection techniques require optimization of primer concentrations, result in non-specific background, slower results, lower sensitivity, and limited multiplexing capabilities.
Innovation Solution
The use of hairpin-forming primers with tag and anti-tag sequences, blockers, and capture complexes on microspheres for nucleic acid amplification and detection, allowing for optimized primer concentrations, faster results, reduced background noise, enhanced sensitivity, and higher multiplexing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional primer designs are used, then the amplification process is simpler, but the assay requires optimization of primer concentrations and produces non-specific background
Solution Approach 1:
The primer is divided into distinct functional segments: a target-specific region for amplification, a tag sequence for capture, and an anti-tag sequence that forms a hairpin structure. This segmentation allows each region to perform its specific function independently, improving reliability while managing complexity through modular design
Solution Approach 2:
The anti-tag sequence is nested within the primer structure, forming a hairpin configuration where the anti-tag binds to the tag sequence. This nested arrangement keeps the capture functionality integrated within the primer itself, eliminating the need for separate capture reagents and reducing overall assay complexity
2Reliability
If conventional amplification methods are used, then the process is faster, but the sensitivity and multiplexing capabilities are limited
Solution Approach 1:
The primers are pre-configured with hairpin structures and tag sequences before the amplification reaction begins. This preliminary preparation ensures that as soon as amplification occurs, the products are immediately available for capture and detection without requiring additional preparation steps, thus maintaining speed while enhancing sensitivity
Solution Approach 2:
The hairpin-forming primers act as intermediaries that bridge the amplification process and the detection process. The tag sequences in the primers serve as mediators that connect the amplified products to the capture complexes, enabling sensitive detection without adding time to the overall assay
3Reliability
If DNA binding dyes are used, then the detection is simpler, but the non-specific background is higher
Solution Approach 1:
The detection system extracts the specificity function from the DNA binding dyes and relocates it to the hairpin structure itself. The hairpin configuration provides inherent specificity through its structured conformation, eliminating the need for dyes and their associated non-specific binding problems, while simplifying the detection system by using the structure itself as the detection element
4Adaptability or versatility
If standard primer sets are used, then the multiplexing is limited, but the assay optimization is simpler
Solution Approach 1:
The hairpin-forming primer design provides universal functionality across multiple targets. The same hairpin structure and tag sequences can be used with different target-specific regions, allowing the same capture complexes to work with multiple primer sets. This universality enables high-level multiplexing while maintaining consistent assay performance across different targets, simplifying optimization
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
The methods provide assays with quicker results, lower non-specific background, higher specific signal, more sensitive detection, and allow for higher multiplexing of primer sets, suitable for multiplexed assays and point-of-care applications.
Implementation Method 1
the tag and anti-tag sequences hybridize forming a hairpin structure
Implementation Method 2
the polymerase extends the primer and creates a double-stranded amplification product
Implementation Method 3
the hairpin structure is disrupted and the tag region becomes available to bind to another anti-tag probe
Implementation Method 4
hybridizing the amplified target nucleic acid to the anti-tag sequence of the capture complex
Data Source
AI summary
Methods and compositions for nucleic acid amplification, detection, and genotyping techniques are disclosed. In one embodiment, a nucleic acid molecule having a target-specific primer sequence; an anti-tag sequence 5′ of the target-specific primer sequence; a tag sequence 5′ of the anti-tag sequence; and a blocker between the anti-tag sequence and the tag sequence is disclosed. Compositions containing such a nucleic acid molecule and methods of using such a nucleic acid molecule are also disclosed.