Spike-in Controls for Molecular Biology Contamination Detection
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Solution Overview
Problem
Molecular biology workflows, particularly those involving nucleic acid amplification and multiple samples, are prone to cross-contamination and misidentification, leading to erroneous conclusions and potential misdiagnosis.
Innovation Solution
The methods involve forming a reaction composition with spike-in controls and adapters, generating and amplifying sample fragments, and sequencing to detect contamination by identifying amplified spike-in controls not associated with the reaction, thereby improving library sequencing quality and preventing contaminated samples from being sequenced.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple samples are processed simultaneously in molecular biology workflows, then productivity is improved, but cross-contamination between samples increases
Solution Approach 1:
The patent introduces spike-in controls as intermediary elements added to each sample reaction. These controls serve as mediators that allow monitoring of contamination without interfering with the primary sample analysis. The spike-in controls enable the system to distinguish between genuine sample signals and contaminant signals, thus maintaining reliability while processing multiple samples simultaneously.
Solution Approach 2:
The patent implements feedback mechanisms by sequencing the spike-in control regions and comparing their sequences against expected patterns. This feedback loop allows the system to detect contamination in real-time or post-processing, enabling corrective actions to be taken and ensuring only valid samples proceed to analysis, thereby maintaining sample identification accuracy during high-throughput processing.
2Measurement precision
If spike-in controls are added to detect contamination, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent segments the nucleic acid sequence into distinct functional regions: sample-specific regions, universal regions, and spike-in control regions. This segmentation allows the spike-in controls to be integrated into the existing sequencing workflow without requiring completely separate detection systems. The controlled regions can be processed using the same sequencing machinery while providing enhanced measurement precision for contamination detection.
3Productivity
If all library fragment products are sequenced, then productivity is maintained, but loss of information increases due to contaminated data
Solution Approach 1:
The patent performs preliminary action by adding and amplifying spike-in controls before the main sequencing step. This allows contamination to be detected and identified prior to full sequencing analysis. Samples with contaminated spike-in controls can be flagged and excluded from downstream analysis, preventing loss of information from contaminated data while maintaining productivity by processing all samples through the same workflow.
Solution Approach 2:
The patent extracts and sequences only the spike-in control regions from the amplified products to assess contamination status. By taking out just the control regions for initial screening, the system can identify contaminated samples without requiring full sequencing of all library fragment products, thus preventing information loss from contaminated data while maintaining overall sequencing productivity.
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 effectively identifies and excludes contaminated samples, enhancing the accuracy of molecular biology workflows by ensuring the integrity of sequencing data and preventing misdiagnosis.
Implementation Method 1
amplifying the reaction composition to generate a multiplicity of amplification products comprising a multiplicity of ligation product amplicons and a multiplicity of spike in control amplicons
Implementation Method 2
ligating the at least one adapter to the sample fragments to generate ligation products
Data Source
AI summary
The disclosed methods and kits are useful in processing and analyzing a multiplicity of samples in molecular biology workflows where there is an increased chance for sample cross-contamination or misidentification. Some embodiments of the methods and kits utilize at least one spike in control and at least one barcode per sample.