BRCA1 Amplification Detection via Molecular Combing and PCR
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods fail to detect and characterize amplifications in the BRCA1 gene, particularly those involving tandem triplications or sequences with high repeat content, which are missed due to their complexity and similarity to wild-type sequences.
Innovation Solution
The use of Molecular Combing and PCR-based techniques for direct visualization and characterization of amplifications, including triplications in the BRCA1 and NBR2 genes, allowing for the detection of multiple copies and precise mapping of sequence amplifications, even in repeat-rich regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional PCR-based mutation screening combined with DNA sequencing is used, then point mutations and small frameshifts can be detected, but complex rearrangements including deletions and duplications of large genomic regions cannot be detected
Solution Approach 1:
The patent divides the detection process into multiple specialized techniques: Southern blot analysis for large rearrangements, QMPSF for quantitative analysis of short fluorescent fragments, and real-time PCR for amplification detection. Each method targets specific types of mutations, allowing comprehensive detection across different mutation classes that a single method cannot cover.
Solution Approach 2:
The patent develops a multi-functional detection system that can identify various mutation types including point mutations, small frameshifts, large deletions, duplications, and complex rearrangements. By integrating multiple detection methods, the system achieves universal applicability across diverse mutation scenarios while maintaining high precision for each specific mutation type.
2Measurement precision
If Southern blot analysis combined with long-range PCR is used, then complex rearrangements can be detected, but the process becomes time-consuming and complex
Solution Approach 1:
The patent employs QMPSF (quantitative multiplex PCR of short fluorescent fragments) to detect specific regions of interest without requiring complete analysis of the entire genomic region. This partial action approach allows rapid detection of known mutation hotspots, significantly reducing detection time while maintaining high accuracy for clinically relevant mutations.
Solution Approach 2:
The patent uses PCR-based methods to amplify specific genomic regions of interest before analysis, creating multiple copies of target sequences. This copying approach enables sensitive detection of rare mutations and reduces the amount of starting material needed, while also allowing parallel analysis of multiple regions to save time.
3Quantity of substance
If fluorescence-based methods are used, then quantitative information can be obtained, but repeat-rich regions and sequences with high homology cannot be properly detected
Solution Approach 1:
The patent designs probes and primers with specific local characteristics tailored to different genomic regions. For repeat-rich regions, specialized probe designs with unique flanking sequences are used to ensure specific binding. For high-homology regions, mismatch-tolerant or stringency-optimized conditions are applied locally, allowing quantitative detection while maintaining precision despite sequence complexity.
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 immediate detection and characterization of amplifications, such as the triplication of exons 1a, 1b, and 2 in the BRCA1 gene, improving upon existing methods by accurately identifying and quantifying amplifications that were previously undetectable, and providing a basis for determining predisposition to breast and ovarian cancer.
Implementation Method 1
The use of Molecular Combing and PCR-based techniques for direct visualization and characterization of amplifications
Implementation Method 2
PCR-based techniques for direct visualization and characterization of amplifications
Implementation Method 3
hybridization probes bind to complementary DNA sequences to detect and characterize amplifications
Data Source
AI summary
Methods for detecting the amplifications of sequences in the BRCA1 locus, which sequences have ends consisting of or are framed with sequence stretches present at least twice in the BRCA1 locus, and which amplification results in at least two or at least three, especially three, tandem copies of the amplified sequence; methods for determining a predisposition to diseases or disorders associated with these amplifications, including predisposition to ovarian cancer or breast cancer and methods for detecting amplifications with similar features in other loci.