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Related Concept Videos

RNA Editing02:23

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RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
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Related Experiment Video

Updated: Apr 18, 2026

2D-HELS MS Seq: A General LC-MS-Based Method for Direct and de novo Sequencing of RNA Mixtures with Different Nucleotide Modifications
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Development of Universal Mass Exclusion List (UMEL) for RNA modification mapping.

Asif Rayhan1, Patrick A Limbach1, Balasubrahmanyam Addepalli2,3

  • 1Rieveschl Laboratories for Mass Spectrometry, Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221-0172, USA.

RNA (New York, N.Y.)
|April 16, 2026
PubMed
Summary

This study introduces a new liquid chromatography tandem mass spectrometry (LC-MS/MS) method to improve RNA modification mapping. The technique enhances the identification of modified nucleosides in RNA sequences, aiding biochemical significance studies.

Keywords:
RNA mass mappingRNA modification mappingmodified nucleosidetRNA modificationuniversal mass exclusion list

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Genomics

Background:

  • Identifying modified nucleosides in RNA is vital for understanding their biochemical roles.
  • Mapping these modifications in low-abundance RNAs presents significant challenges.

Purpose of the Study:

  • To develop an advanced liquid chromatography tandem mass spectrometry (LC-MS/MS) strategy for enhanced RNA modification mapping.
  • To improve the identification of modified nucleosides within RNA sequences.

Main Methods:

  • Implementation of an LC-MS/MS exclusion list strategy to filter out unmodified oligonucleotides.
  • Utilizing enhanced dissociation of modified oligonucleotides during MS/MS analysis.
  • Application of the universal exclusion list to diverse natural RNA samples.

Main Results:

  • The developed method significantly enhances sequence information from modified oligonucleotides.
  • This approach yields at least 10% more mapped RNase T1 digestion products compared to standard data-dependent acquisition (DDA).
  • Successful RNA modification mapping of total tRNAs from four diverse organisms (prokaryotic and eukaryotic) was demonstrated.

Conclusions:

  • The LC-MS/MS exclusion list strategy offers a universal and effective tool for RNA modification mapping.
  • This method improves the discovery and analysis of modified nucleosides across various RNA types and organisms.
  • The approach provides enhanced data for understanding the biochemical significance of RNA modifications.