Off-target sequence data for LOH detection
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Solution Overview
Problem
Current methods for genome analysis, particularly in prenatal diagnostics and tumor analysis, often discard off-target reads generated during targeted-capture massively parallel sequencing, which can provide crucial information on aneuploidies and loss of heterozygosity (LOH) events, limiting the accuracy and sensitivity of diagnostic methods.
Innovation Solution
The method leverages off-target sequence data in combination with on-target data to derive insights for detecting chromosomal aberrances, such as fetal aneuploidy and LOH, by utilizing off-target reads that were previously considered non-informative, thereby optimizing the use of limited genetic material and reducing sample handling requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If off-target reads are discarded during targeted-capture sequencing, then sequencing cost and data processing complexity are reduced, but diagnostic accuracy and sensitivity for detecting aneuploidies and LOH events are worsened
Solution Approach 1:
The patent recovers and utilizes off-target reads that were previously discarded during targeted-capture sequencing. By reanalyzing these discarded sequences, the method extracts valuable information for detecting aneuploidies and LOH events, transforming waste data into diagnostic resources without requiring additional sequencing experiments.
Solution Approach 2:
The patent makes off-target reads serve multiple functions: they are used both for detecting aneuploidies and for detecting loss of heterozygosity events. This multi-functional utilization of previously discarded data maximizes the diagnostic value extracted from the same sequencing experiment, improving overall diagnostic capabilities without additional costs.
2Adaptability or versatility
If limited genetic material is used for comprehensive analysis, then sample availability is constrained, but diagnostic coverage can be improved by using off-target reads
Solution Approach 1:
The method allows the limited genetic material to serve itself multiple times by extracting both on-target and off-target information from the same DNA sample. The off-target reads, which would normally be waste, are reused to provide additional diagnostic information, effectively multiplying the value of the limited genetic material without requiring more sample.
Solution Approach 2:
The same genetic material is used to detect multiple conditions: aneuploidies through off-target read analysis and LOH events through combined on-target and off-target analysis. This multi-functional use of limited DNA maximizes diagnostic coverage while minimizing sample requirements.
3Reliability
If only on-target data is used for analysis, then data processing is simplified, but sensitivity for detecting chromosomal aberrations is reduced
Solution Approach 1:
The patent recovers diagnostic information from off-target reads that were previously discarded. By developing bioinformatics pipelines to analyze these reads, the method increases detection sensitivity for aneuploidies and LOH events, accepting the added complexity as necessary for improved diagnostic reliability.
Data Source
AI summary
The present teachings concern a method for genome-wide determination of the presence or absence of a loss of heterozygosity (LOH) in a biological sample, said sample comprising one or more DNA molecules, the method comprising: a) obtaining DNA from said biological sample; b) contacting said DNA with one or more labeled RNA or DNA probes, thereby allowing hybridization of said probes to said DNA; c) capturing said hybridized DNA:probes; d) performing sequencing of said captured DNA, thereby obtaining reads; e) mapping said reads to a reference genome; f) separating the on-and off-target reads; g) obtaining off-target read counts; and using said off-target read counts for determining the presence or absence of a LOH.