Three-Probe Chromosomal Translocation Analysis System
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Solution Overview
Problem
Current break-apart probe systems for analyzing chromosomal translocations, particularly in non-small cell lung cancer, face challenges with false positive results due to the nature of chromosomal rearrangements within the same chromosome, such as inversions, leading to incorrect signal resolution and scarcity of biopsy material.
Innovation Solution
A method involving three nucleic acid probes that hybridize to genomic DNA sequences 5' and 3' to a breakpoint and adjacent to it, allowing for the detection of chromosomal translocations by establishing specific signal orders and orientations, and comparing these to control samples to accurately determine the presence of inversions or rearrangements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If break-apart probe systems are used to analyze chromosomal translocations, then chromosomal abnormalities can be detected, but false positive results occur due to inversions and same-chromosome rearrangements
Solution Approach 1:
The probe system is segmented into three distinct probes: a first probe binding to a first chromosomal region, a second probe binding to a second chromosomal region, and a third probe binding to a third chromosomal region. This segmentation allows differentiation between normal and abnormal chromosomal configurations by detecting specific signal patterns, thereby reducing false positives from inversions while maintaining translocation detection capability.
2Device complexity
If traditional two-probe break-apart systems are used, then the system is simple, but it cannot distinguish between true translocations and false positives from inversions
Solution Approach 1:
The invention adds a third dimension to the probe system by introducing a third probe that binds to a third chromosomal region. This additional probe creates a three-dimensional signal pattern that can distinguish between true translocations and false positives from inversions, enhancing diagnostic accuracy without significantly complicating the overall system structure.
3Quantity of substance
If biopsy material is used for analysis, then diagnostic information can be obtained, but the scarcity of material limits the ability to perform multiple analyses
Solution Approach 1:
The three-probe system is designed to achieve diagnostic reliability with limited biopsy material by using a streamlined protocol that requires minimal sample input. The method enables sufficient signal detection and pattern recognition even with scarce material, allowing reliable diagnosis without needing to perform multiple separate analyses that would deplete the limited sample.
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 enhances the accuracy of chromosomal translocation analysis by reducing false positive results and providing clear, distinguishable signals for both same-chromosome and between-chromosome translocations, improving diagnostic reliability.
Implementation Method 1
Molecular cytogenetics methods are based on hybridization of a nucleic acid probe to its complementary nucleic acid within a cell. A probe for a specific chromosomal region will recognize and hybridize to its complementary sequence on a metaphase chromosome or within an interphase nucleus
Data Source
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AI summary
The present disclosure relates to systems and methods for analyzing chromosomal translocations, and in particular to analysis of chromosomal translocation by in situ hybridization. The method employs a 5 '-probe, a 3 '-probe and a probe binding adjacent to, optionally overlapping, the breakpoint. The probes are differently labelled. In particular, the use in the detection of translocations involving the ALK gene are described.