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Imaging rRNA Methylation in Bacteria by MR-FISH.

Kristina A Ganzinger1, Martin R Challand2, James Spencer3

  • 1Department of Living Matter, AMOLF, Amsterdam, The Netherlands.

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|August 14, 2019
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Summary

This study introduces methylation-sensitive RNA in situ hybridization (MR-FISH), a novel method for single-cell bacterial RNA methylation analysis. MR-FISH enables direct visualization of methylation without bulk sample processing.

Keywords:
Antibiotic resistanceAutomated image analysisBacteriologyDNA probesEpitranscriptomic modificationsFISHFluorescence imagingIn situ hybridizationMicroscopyRNA methylationRNA modificationRibosomal RNASingle-cell methods

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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.