Dual-Fluorescence Chromosome-Located Labeling System for Accurate In Vivo Single-Cell Gene Expression Analysis in...

Area of Science:

• Microbiology
• Bacterial Adaptation
• Epigenetics

Background:

• Phenotypic heterogeneity in bacteria, variation not linked to genetics or environment, is crucial for adaptation.
• Traditional population-level assays mask individual bacterial behavior, necessitating single-cell analysis.
• Fluorescent labeling is vital for single-cell gene expression studies in bacteria.

Purpose of the Study:

• To improve analytical power for studying bacterial phenotypic heterogeneity.
• To develop a method for tracking gene expression variation at the single-cell level in Pseudomonas syringae.
• To enable robust analysis of bacterial populations in complex environments.

Main Methods:

• Generation of chromosome-located transcriptional gene fusions to fluorescent reporter genes in Pseudomonas syringae.
• Integration of constitutively expressed compatible fluorescent reporter genes at a neutral chromosomal locus.
• Combination of transcriptional fusions with constitutive reporters for dual-color single-cell analysis.

Main Results:

• The improved method allows for simultaneous monitoring of gene of interest expression and total population presence.
• Constitutive reporters enable detection of all cells, including those with low target gene expression.
• This approach avoids the need for external stains, enhancing compatibility with complex samples.

Conclusions:

• The enhanced method provides greater analytical power for dissecting bacterial phenotypic heterogeneity.
• This technique facilitates deeper understanding of adaptive mechanisms driven by epigenetic regulation.
• The improved single-cell analysis is valuable for studying bacterial pathogens in natural settings.