16S rRNA Sequencing for Rapid Species-Level Microbial Identification
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Solution Overview
Problem
Existing microbiology methods for identifying and quantifying microorganisms are limited by culturability issues, slow growth rates, difficulty in cultivating anaerobes, and the need for multiple tests, while qPCR methods provide limited target coverage and are costly.
Innovation Solution
A next-generation sequencing (NGS)-based 16S ribosomal RNA gene-targeted sequencing approach that includes efficient nucleic acid isolation, 16S library preparation with V1-V3 and V3-V4 primers, and bioinformatics analysis using FIGARO and DADA2 for error correction and taxonomy assignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If culture-based microbial analysis is used, then microbial identification and quantification can be achieved, but the process is slow (taking days or weeks) and has limited coverage (many microbes are not culturable)
Solution Approach 1:
The patent replaces the mechanical/cultivation-based microbial identification system with a molecular sequencing system. Instead of growing microbes on agar plates and observing colonial characteristics, the method extracts DNA from microbial samples and sequences the 16S rRNA gene to identify microbes at the species level. This substitution eliminates the need for microbial cultivation, reducing time from days/weeks to hours while maintaining identification accuracy.
Solution Approach 2:
The patent uses molecular copying by amplifying the 16S rRNA gene through PCR to create multiple copies of the genetic material for sequencing. This allows analysis of microbial DNA without needing to culture the organisms themselves, enabling rapid identification of non-culturable microbes while maintaining species-level resolution.
2Loss of time
If qPCR is used for microbial detection, then results can be obtained quickly (within a couple of hours), but the target coverage is limited (cost-effective qPCR panel normally covers less than 30 targets)
Solution Approach 1:
The patent employs universal 16S rRNA gene primers that can amplify and sequence a broad range of bacterial taxa simultaneously. The sequencing approach allows multiplex detection of numerous microbial species in a single run, enabling coverage of hundreds to thousands of targets compared to qPCR's limitation of 30 targets. This universal priming strategy maintains rapid detection timing while dramatically expanding target coverage.
3Adaptability or versatility
If multiple tests are performed to cover potential pathogens (aerobes, anaerobes, fungi), then comprehensive microbial detection is achieved, but the complexity and time required increase
Solution Approach 1:
The patent merges the detection of multiple microbial groups (aerobes, anaerobes, fungi) into a single unified sequencing assay. By targeting the conserved 16S rRNA gene with universal primers, the method simultaneously detects diverse microbial taxa in one test, eliminating the need for separate culture conditions and staining protocols for different microbial groups. This consolidation reduces test complexity while maintaining comprehensive coverage.
Data Source
AI summary
Methods and devices are provided for the identification and/or quantification of microbes. In particular, the methods comprise: (a) extracting DNA from a microbial sample; (b) performing 16S ribosomal RNA gene-targeted sequencing to obtain DNA sequences; and (c) analyzing the DNA sequences to identify the species of the one or more microbes.