Multiplex PCR for CFTR Gene Deletion Detection
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Solution Overview
Problem
Current methods for detecting cystic fibrosis transmembrane regulator (CFTR) gene deletions or duplications are inefficient and fail to effectively identify the variety of defects underlying the disease, which are crucial for accurate diagnosis and management of cystic fibrosis.
Innovation Solution
A method involving multiplex polymerase chain reaction (PCR) is used to amplify multiple target segments of the CFTR gene in a single vessel, utilizing oligonucleotide primer pairs specific to each segment, allowing for the detection of deletions or duplications across various exons and the promoter region without the need for complex PCR methods like nested PCR or touchdown PCR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple CFTR gene segments are amplified using separate PCR reactions, then detection accuracy is improved, but detection efficiency and time consumption deteriorate
Solution Approach 1:
The patent combines multiple separate PCR reactions into a single multiplex PCR reaction by designing specific primer pairs that can simultaneously amplify multiple CFTR gene segments (exons 1-24) in one reaction vessel. This merging approach maintains detection accuracy for all segments while significantly improving efficiency by eliminating the need for multiple separate reactions and reducing time consumption.
Solution Approach 2:
The multiplex PCR system serves multiple functions simultaneously: it detects deletions, duplications, and point mutations across all CFTR exons in a single assay. The universal primer design allows the same reaction system to identify various types of genetic defects that would otherwise require different specialized tests, thereby improving both accuracy and efficiency.
2Reliability
If complex PCR methods like nested PCR or touchdown PCR are used, then amplification specificity is improved, but method complexity and ease of operation deteriorate
Solution Approach 1:
The patent optimizes PCR parameters including primer concentrations, annealing temperatures, and cycle conditions to achieve high-specificity amplification of multiple CFTR segments in a single reaction. By carefully adjusting these parameters, the method maintains amplification specificity comparable to nested or touchdown PCR but with a simpler single-step procedure that is easier to operate and reproduce.
3Adaptability or versatility
If all 27 exons of CFTR are detected in a single multiplex PCR, then comprehensive diagnosis is improved, but primer design complexity and detection reliability deteriorate
Solution Approach 1:
The patent divides the CFTR gene into 24 detectable segments (exons 1-24) and designs specific primer pairs for each segment. This segmentation allows comprehensive coverage of all CFTR regions while maintaining manageable primer design and reliable amplification for each individual segment within the multiplex system.
Solution Approach 2:
The patent includes internal control segments in the multiplex PCR system that serve as positive and negative controls. These control segments provide real-time feedback on the reliability of the amplification reaction, allowing verification that all CFTR segments are being detected with appropriate sensitivity and specificity, thereby maintaining high detection reliability across all 27 exons.
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 the simultaneous detection of multiple CFTR gene segments, providing a more efficient and accurate diagnosis of cystic fibrosis by identifying deletions or duplications, thereby aiding in the genetic basis of the disease.
Implementation Method 1
amplifying multiple target segments of the CFTR gene in a single vessel using oligonucleotide primer pairs specific to each of the target segments
Implementation Method 2
amplifying multiple target segments of the CFTR gene in a single vessel using oligonucleotide primer pairs specific to each of the target segments in a multiplex polymerase chain reaction (PCR)
Data Source
AI summary
The present invention relates to methods for amplifying various regions of the cystic fibrosis transmembrane regulator (CFTR) gene. Methods are provided for amplifying one or all 27 exons of the CFTR gene and a portion of the CFTR promoter region in a single tube. The method can identify the presence or absence of CF deletions or insertions in a sample and assist in the diagnosis of a genetic predisposition to cystic fibrosis.