Ion Torrent Semiconductor Sequencing for Rapid Genomic Analysis
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Solution Overview
Problem
Current methods for diagnosing drug-resistant Mycobacterium tuberculosis strains, such as the GenoType MTBDRplus Line Probe Assay, are limited in detecting novel or uncommon mutations, and existing sequencing protocols are labor-intensive and costly, requiring expensive equipment, making them unsuitable for resource-limited settings.
Innovation Solution
A semiconductor sequencing protocol using Ion Torrent sequencing for rapid and cost-effective analysis of full-length genes and complete genomes, enabling the identification of both known and unknown mutations, particularly for Mycobacterium tuberculosis, which simplifies the process and reduces the need for expensive ancillary equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If culture-based drug susceptibility testing (DST) is used to diagnose MDR strains, then reliable and reproducible results are obtained, but the process is time-consuming (weeks to months), technically challenging, and cost-prohibitive
Solution Approach 1:
The patent replaces the mechanical culture-based DST system with a semiconductor-based sequencing system. The Ion Torrent sequencing technology uses semiconductor chips to detect nucleic acid sequences through pH changes during DNA synthesis, eliminating the need for prolonged bacterial culture and manual observation, thereby reducing testing time from weeks to days while maintaining diagnostic reliability
Solution Approach 2:
The patent introduces nucleic acid extraction and PCR amplification as intermediary steps between sample collection and final diagnosis. By converting bacterial genetic material into detectable DNA sequences through these intermediary processes, the system achieves rapid identification of drug resistance mutations without requiring prolonged bacterial culture
2Loss of time
If the GenoType MTBDRplus Line Probe Assay is used for rapid diagnosis, then testing time is reduced, but the ability to detect novel or uncommon mutations is limited
Solution Approach 1:
The patent changes the detection parameter from fixed probe hybridization (LPA) to variable sequence reading (semiconductor sequencing). The semiconductor chip can detect any nucleotide sequence by measuring pH changes during DNA synthesis, allowing identification of known and novel mutations simultaneously, thereby enhancing adaptability while maintaining rapid testing
Solution Approach 2:
The semiconductor sequencing system performs multiple functions: it detects known drug resistance mutations, identifies novel mutations, and provides complete genotypic characterization. This universal approach replaces the specialized LPA system that only detects predefined mutations, enhancing versatility without sacrificing speed
3Adaptability or versatility
If existing sequencing protocols are used for genome analysis, then comprehensive mutation detection is achieved, but the process becomes labor-intensive and requires expensive equipment
Solution Approach 1:
The patent extracts the core sequencing function from complex traditional sequencing equipment and implements it on a semiconductor chip. By taking out the essential DNA synthesis detection capability and placing it on a miniaturized chip, the system achieves comprehensive genome analysis without requiring large, expensive sequencing machines, thereby reducing device complexity while maintaining analytical capability
Solution Approach 2:
The patent uses disposable semiconductor chips for sequencing reactions. Each chip is used once and then discarded, eliminating the need for expensive, complex equipment that requires maintenance and calibration. This approach makes comprehensive genome analysis accessible in resource-limited settings by replacing capital-intensive equipment with affordable consumables
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 allows for rapid, standardized, and cost-effective characterization of drug resistance mutations, improving the detection of novel polymorphisms and reducing the complexity and expense of existing sequencing methods, making it suitable for resource-deprived environments like Africa and Asia.
Implementation Method 1
Ion Torrent sequencing is a semiconductor based sequencing technology that detects the release of hydrogen ions during polymerization
Implementation Method 2
Each sensing element measures the concentration of hydrogen ions in a sample solution applied to an array of semiconductor sensing elements
Implementation Method 3
The sequence of nucleotides in a DNA or RNA molecule is determined by measuring the release of hydrogen ions during polymerization
Data Source
AI summary
Disclosed is an enhanced method for rapid and cost-effective analysis of sequences of a microorganism by semi-conductor sequencing, preferably ion-torrent sequencing. This method provides for full length analysis and of multiple areas (e.g. genes) of multiple genomes. These methods identify genetic mutations of a particular gene that are responsible for conferring resistance or sensitivity to an antibiotic or other chemical compound. Multiple different species, strains and/or serotypes of a particular organism are rapidly and efficiently screened and mutations identified along with the complete genome of an organism. By selecting primers pairs of similar size and GC content that produce amplicons with sequences spanning the entire genome, a single PCR reaction analyzed by ion torrent methodology can determine the sequence of a complete genome. Methods are useful to sequences the genomes of viral agents, such as influenza virus, and bacterial agents, such as tuberculosis bacteria.