Comparative tRNA sequencing and RNA mass spectrometry for surveying tRNA modifications

Area of Science:

• Molecular Biology
• Genomics
• Biochemistry

Background:

• Chemical modifications of nucleosides in transfer RNAs (tRNAs) are diverse but systematically charted in few organisms.
• Understanding tRNA modification patterns is crucial for deciphering gene expression regulation and cellular function.

Purpose of the Study:

• To develop and validate a rapid approach for predicting and identifying tRNA modifications.
• To investigate Vibrio cholerae tRNA modifications and their response to environmental conditions.

Main Methods:

• Coupling high-throughput transfer RNA-sequencing (tRNA-seq) for predicting modified sites via reverse transcription signatures.
• Utilizing RNA mass spectrometry for direct identification and characterization of tRNA modifications.
• Comparative tRNA-seq analysis between Vibrio cholerae and Escherichia coli.

Main Results:

• Identified several Vibrio cholerae-specific tRNA modifications absent in Escherichia coli.
• Revealed environmental influences on Vibrio cholerae tRNA modification profiles.
• Discovered a novel modification, acetylated acp³U (acacp³U), and C-to-Ψ RNA editing in V. cholerae.

Conclusions:

• The combined tRNA-seq and mass spectrometry approach enables rapid surveillance of tRNA modification patterns.
• This method facilitates the study of environmental control over tRNA modification.
• The findings expand the known landscape of RNA modifications and RNA editing processes.