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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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RNA sequencing, or RNA-Seq, is a high-throughput sequencing technology used to study the transcriptome of a cell. Transcriptomics helps to interpret the functional elements of a genome and identify the molecular constituents of an organism. Additionally, it also helps in understanding the development of an organism and the occurrence of diseases. 
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Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
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Types of RNA01:20

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Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in regulating gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
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Nucleic Acid Structure01:25

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The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms  a 5′ to 3′ phosphodiester linkage.
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The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
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Related Experiment Video

Updated: Sep 14, 2025

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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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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Chemical decoding strategies for detecting RNA modifications, dynamics and structures.

Xiao Shu1, Wenping Li1

  • 1College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China. shuxiao@cdut.edu.cn.

Chemical Communications (Cambridge, England)
|July 23, 2025
PubMed
Summary
This summary is machine-generated.

Recent chemical decoding strategies precisely map RNA modifications, dynamics, and structures. These sequencing-based approaches offer powerful tools for understanding RNA

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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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Area of Science:

  • Molecular Biology
  • Chemical Biology
  • Genomics

Background:

  • RNA modifications, dynamics, and structures are crucial regulatory layers influencing gene expression and biological processes.
  • Accurate detection and interpretation of these RNA features are essential for understanding cellular functions.

Purpose of the Study:

  • To review recent advances in nucleotide-targeted chemical reactions for RNA analysis.
  • To highlight sequencing-based decoding approaches for mapping and quantifying RNA modifications, dynamics, and structures.

Main Methods:

  • Utilizing site-specific chemical reactions that alter ribonucleotide bases or disrupt local structures.
  • Employing sequencing-based decoding to generate detectable signals (mutations, terminations, deletions) at specific RNA sites.
  • Integrating chemical tools with sequencing and imaging for comprehensive RNA landscape analysis.

Main Results:

  • Chemical decoding strategies enable precise mapping and quantification of RNA modifications at single-nucleotide resolution.
  • These methods facilitate the monitoring of RNA dynamics and the characterization of RNA structural conformations.
  • Innovative chemical tools provide powerful strategies for decoding complex RNA landscapes.

Conclusions:

  • Recent chemical decoding strategies represent a significant advancement in RNA analysis.
  • These approaches offer powerful tools for elucidating RNA-related biological functions.
  • The integration of chemical methods with sequencing and imaging holds great promise for future RNA research.