Fluorescent Reporter Plasmid for Bacillus State Visualization
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Solution Overview
Problem
Current methods for visualizing the state of Bacillus strains, such as distinguishing between dormant endospore and metabolically active vegetative states, are limited in precision and require custom genetic modifications and integration into the host chromosome, which is time-consuming and not universally applicable.
Innovation Solution
A fluorescence reporter plasmid system that allows Bacillus strains to fluoresce differently in their dormant endospore and metabolically active vegetative states, functioning extra-chromosomally and using dual reporter genes like GFP and DsRed, enabling visualization without the need for integration into the host chromosome.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If custom genetic modifications and integration into the host chromosome are used to visualize Bacillus strain states, then measurement precision is improved, but device complexity and time consumption increase
Solution Approach 1:
The plasmid is divided into separate functional modules: promoter regions (spore-specific and vegetative-specific), reporter genes (GFP, DsRed, mCherry), and replication/selection elements. This modular design allows flexible combination of different reporter genes with appropriate promoters to visualize specific bacterial states without complex chromosomal integration
Solution Approach 2:
The plasmid acts as an intermediary carrier that delivers reporter genes into Bacillus cells temporarily. Instead of permanently integrating into the chromosome, the plasmid provides the necessary genetic elements for fluorescence expression while maintaining independent replication, thus simplifying the overall system
2Reliability
If chromosomal integration is performed to establish stable fluorescence expression, then reliability is improved, but productivity and ease of manufacture deteriorate
Solution Approach 1:
The plasmid is pre-configured with all necessary elements for stable expression including strong promoters, ribosome binding sites, and appropriate terminators. This preliminary preparation ensures that once the plasmid enters the cell, immediate and stable fluorescence expression occurs without requiring time-consuming chromosomal integration steps
Solution Approach 2:
The plasmid contains replication origins that enable it to replicate independently within the Bacillus cell. This copying mechanism ensures multiple copies of the reporter genes are maintained, providing sufficient expression levels for reliable visualization without permanent chromosomal integration
3Adaptability or versatility
If multiple strains with different genetic circuits are developed to achieve different fluorescence colors, then adaptability is improved, but device complexity increases
Solution Approach 1:
The plasmid backbone is designed as a universal platform that can accommodate multiple different reporter genes (GFP, DsRed, mCherry) and multiple promoter types. This multi-functional design allows a single plasmid construction to provide various fluorescence color options by simply changing the reporter gene insert, eliminating the need to develop entirely separate strain systems for each color
Solution Approach 2:
Multiple promoter-reporter gene combinations are merged into a single plasmid system. The plasmid can simultaneously carry or alternatively carry different promoter-gene fusions, allowing researchers to visualize multiple bacterial states (spore, vegetative, germinating) with different fluorescence colors using a single transformable unit rather than maintaining separate strain collections
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
Enables stable and efficient visualization of Bacillus strain states, facilitating the tracking of germination and growth without the need for custom genetic modifications, and can be maintained in most Bacillus strains, allowing for rapid assessment and analysis in various samples.
Implementation Method 1
The plasmid system enables in one aspect a Bacillus strain to fluoresce after the plasmid has been transformed into the Bacillus cell, wherein the Bacillus strain fluoresces in its dormant endospore state and/or in its metabolically active vegetative state
Data Source
AI summary
The present invention relates to fluorescence reporter plasmid systems for enabling a Bacillus strain to fluoresce, and to methods for visualizing the state of Bacillus strains.