Nucleic Acid Amplification Primers for Clonality Studies
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Solution Overview
Problem
Current PCR-based clonality studies face challenges in accurately detecting clonal rearrangements of Ig and TCR genes due to limitations in sensitivity, interpretation of results, and technical issues such as false positives and negatives, particularly in tissue samples with mixed lymphocyte populations, and the need for standardized protocols.
Innovation Solution
Development of sets of nucleic acid amplification primers and standardized PCR protocols that allow for the detection of clonal rearrangements in Ig and TCR loci, including chromosome aberrations, using heteroduplex analysis and GeneScanning techniques to differentiate between monoclonal and polyclonal samples, and the use of differential labeling for multiplex PCR to enhance specificity and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional PCR-based clonality studies are used, then clonal rearrangements can be detected, but sensitivity and specificity are insufficient leading to false positives and negatives
Solution Approach 1:
The patent segments the detection process into multiple independent PCR reactions, each targeting specific gene loci (IgH, IgK, IgL, TCRα, TCRβ, TCRγ, TCRδ). By dividing the complex detection task into manageable segments with specific primer sets, the method achieves higher sensitivity and reduces false positives compared to conventional single-locus approaches.
Solution Approach 2:
The patent develops universal primer sets that can detect multiple types of clonal rearrangements across different immunoglobulin and T-cell receptor gene loci. These primers are designed to amplify both germline and rearranged configurations, providing a multi-functional detection system that works across various lymphoid malignancy types with high reliability.
2Measurement precision
If PCR protocols are applied to mixed lymphocyte populations, then clonal detection is attempted, but interpretation becomes difficult due to background noise from reactive lymphocytes
Solution Approach 1:
The patent applies local quality by using locus-specific primer sets that target particular gene regions with high specificity. Each primer set is optimized to detect rearrangements at specific immunoglobulin or T-cell receptor loci, allowing precise local detection of clonal populations even within heterogeneous mixed lymphocyte samples, thereby simplifying interpretation.
Solution Approach 2:
The patent employs fluorescently labeled primers and probes that produce distinct color signals for different gene loci and rearrangement types. This visual differentiation through color changes enables easy identification and interpretation of clonal versus polyclonal patterns in mixed populations, reducing interpretation complexity.
3Reliability
If standardized protocols are not used, then flexibility in detection methods is maintained, but sensitivity and detection rate remain below 95%
Solution Approach 1:
The patent implements preliminary action by providing pre-optimized, standardized primer sets and PCR protocols that have been validated to achieve >95% detection rates. These standardized reagents include pre-calculated annealing temperatures, Mg2+ concentrations, and cycling parameters, eliminating the need for extensive method development and ensuring high sensitivity and reliability across different laboratories.
Solution Approach 2:
The patent optimizes critical PCR parameters such as annealing temperature, Mg2+ concentration, and primer lengths to achieve maximum sensitivity and specificity. By systematically adjusting these parameters and establishing standardized protocols, the method achieves >95% detection rates while providing clear, reproducible results that simplify interpretation.
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 approach achieves high sensitivity and specificity in detecting clonal rearrangements, with a detection rate of at least 95% in lymphoid malignancies, enabling accurate diagnosis and minimal residual disease detection, even in samples with low tumor loads and somatic hypermutations.
Implementation Method 1
The present invention provides sets of nucleic acid amplification primers and standardized protocols for the polymerase chain reaction (PCR)
Implementation Method 2
using heteroduplex analysis and GeneScanning techniques to differentiate between monoclonal and polyclonal samples
Implementation Method 3
The sets of primers according to the invention are capable of amplifying clonal rearrangements... with a detection rate of at least 95%
Data Source
AI summary
The invention relates to PCR-based clonality studies for among others early diagnosis of lymphoproliferative disorders. Provided is a set of nucleic acid amplification primers comprising a forward primer, or a variant thereof, and a reverse primer, or a variant thereof, capable of amplifying a rearrangement selected from the group consisting of a VH-JH IGH rearrangement, a DH-JH IGH rearrangement, a VK-JK IGK rearrangement, a VK/intron-Kde IGK rearrangement, a Vλ-Jλ IGL rearrangement, a Vβ-Jβ TCRB rearrangement, a Dβ-Jβ TCRB rearrangement, a Vγ-Jγ TCRG rearrangement, a Vδ-Jδ TCRD rearrangement, a Dδ-Dδ TCRD rearrangement, a Dδ-Jδ TCRD rearrangement, a Vδ-Dδ TCRD rearrangement, or a translocation selected from t(11;14)(BCL1-IGH) and t(14;18)(BCL2-IGH). The primers can be used in PCR-based clonality studies for early diagnosis of lymphoproliferative disorders and detection of minimal residual disease (MRD). Also provided is a kit comprising at least one set of primers of the invention.