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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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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
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The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
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The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
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Updated: Dec 24, 2025

A Nonsequencing Approach for the Rapid Detection of RNA Editing
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Mapping and editing of nucleic acid modifications.

Li-Qian Chen1, Wen-Shuo Zhao1, Guan-Zheng Luo1

  • 1MOE Key Laboratory of Gene Function and Regulation, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, Guangdong, China.

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Nucleic acid modifications regulate gene expression but are hard to detect. New technologies now map and edit these modifications on DNA and RNA, advancing research.

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • Genomics

Background:

  • Nucleic acid modifications are crucial for gene expression regulation, adding information without changing genetic sequences.
  • These modifications act as signals recognized by proteins, enabling diverse gene expression control.
  • Conventional methods struggle to distinguish modified from regular bases, hindering location-specific functional studies.

Purpose of the Study:

  • To review the characteristics of DNA and RNA modifications.
  • To summarize emerging technologies for mapping and editing nucleic acid modifications.
  • To discuss the applications and limitations of these technologies in research.

Main Methods:

  • Review of current literature on nucleic acid modifications.
  • Analysis of novel technologies for modification mapping and editing.
  • Discussion of in vivo and in vitro applications.

Main Results:

  • New technologies enable precise mapping of DNA and RNA modifications.
  • Tools are being developed for targeted in vivo control of modification status.
  • These advancements facilitate detailed functional studies and therapeutic development.

Conclusions:

  • Emerging technologies offer powerful tools for studying nucleic acid modifications.
  • Precise mapping and editing capabilities enhance understanding of gene regulation.
  • These advancements hold significant potential for basic science and translational medicine.