Imaging rRNA Methylation in Bacteria by MR-FISH.

Area of Science:

• Microbiology
• Molecular Biology
• Biotechnology

Background:

• Current RNA methylation analysis relies on bulk methods like sequencing, requiring large cell numbers (~10^4-10^7).
• These methods necessitate pooling cellular RNA, limiting single-cell resolution and detailed spatial analysis.
• Existing techniques are insufficient for cell-by-cell assessment of RNA modifications in bacterial populations.

Purpose of the Study:

• To develop a single-cell method for assaying RNA methylation in bacteria.
• To enable direct visualization and analysis of RNA methylation at the individual cell level.
• To provide a protocol for methylation-sensitive RNA in situ hybridization (MR-FISH) applicable to bacterial studies.

Main Methods:

• Development of methylation-sensitive hybridization probes for rRNA.
• Adaptation of in situ hybridization techniques for bacterial cells.
• Utilizing fluorescence microscopy for single-cell visualization and analysis.
• Providing open-source code for data analysis.

Main Results:

• Demonstration of methylation-sensitive RNA in situ hybridization (MR-FISH) for bacterial rRNA methylation.
• Successful cell-by-cell analysis of RNA methylation without bulk sample preparation.
• Establishment of a protocol for probe design, hybridization, and data interpretation.

Conclusions:

• MR-FISH offers a powerful alternative to bulk methods for studying bacterial RNA methylation.
• This single-cell approach provides unprecedented resolution for analyzing RNA modifications.
• The described protocols and code facilitate broader adoption of MR-FISH in microbial research.