Blocked Primers for Single-Cell TCR Amplification
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Solution Overview
Problem
Current methods for T-cell receptor (TCR) mRNA profiling, such as the SMARTer Human TCR a/b Profiling Kit, face challenges in efficiently amplifying TCR sequences from single cells with minimal reagent dispensing, particularly in achieving high-throughput and accurate diversity analysis.
Innovation Solution
The use of blocked primers, including thermo-labile and enzyme-labile primer pairs, which are activated under specific conditions to facilitate multiple amplification reactions in a single reaction vessel, allowing for efficient cDNA synthesis and amplification of TCR sequences with minimal reagent usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple amplification reactions are performed in separate reaction vessels, then amplification accuracy is maintained, but reagent consumption increases and throughput decreases
Solution Approach 1:
The patent combines multiple amplification reactions into a single reaction vessel by using blocked primers that remain inactive until specifically unblocked. This allows multiple primer pairs to coexist in the same vessel without cross-reacting, enabling parallel amplification of different TCR sequences while reducing reagent consumption and increasing throughput.
Solution Approach 2:
The blocked primers are prepared in advance with blocking moieties attached to their 3' ends. This preliminary blocking prevents premature extension and ensures that each primer pair only activates when its specific unblocking condition is met, maintaining amplification accuracy while enabling multiplexing in a single vessel.
2Productivity
If blocked primers are used to enable multiple amplification reactions in a single vessel, then reagent consumption is reduced and throughput increases, but reaction complexity increases
Solution Approach 1:
The reaction system is segmented into distinct blocked primer pairs, each with specific blocking moieties that respond to different unblocking conditions. This segmentation allows independent control of each amplification reaction within the same vessel, managing complexity through modular design while maintaining high throughput.
Solution Approach 2:
The patent uses different physical or chemical parameters (temperature, enzyme presence, pH) to selectively unblock specific primer pairs. By changing reaction parameters in a controlled sequence, multiple amplification reactions are managed in a single vessel without requiring complex physical separation, thus increasing throughput while controlling complexity through parameter manipulation.
3Productivity
If standard PCR primers are used for TCR amplification, then amplification efficiency is high, but non-specific binding and background noise increase
Solution Approach 1:
The blocked primers prevent non-specific binding by keeping the 3' end blocked until the specific unblocking condition is met. This preliminary anti-action stops premature extension and reduces background noise, while still allowing efficient specific amplification when the blocking moiety is removed under the correct conditions.
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 efficient and accurate TCR repertoire analysis from single cells, reducing reagent consumption and enhancing the ability to analyze TCR diversity, which is crucial for research and clinical applications in aging, autoimmune diseases, cancer, and vaccine development.
Implementation Method 1
thermally-labile blocking moieties
Implementation Method 2
enzymatically-labile blocking moieties
Implementation Method 3
light-labile blocking moieties
Data Source
AI summary
The present disclosure provides methods, compositions, and systems employing blocked primers. Aspects of the disclosure include providing a blocked primer reaction mixture that includes a blocked primer and a template nucleic acid component from a single cell; unblocking the blocked primer to produce an active primer reaction mixture and subjecting the activated primer reaction mixture to primer extension conditions, such as nucleic acid implication conditions.