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Nonsense-mediated mRNA Decay02:27

Nonsense-mediated mRNA Decay

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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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The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
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Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
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Within a biological system, the DNA encodes the RNA, and the nucleotide sequence in the RNA further defines the amino acid sequence in the protein. This is referred to as “The Central Dogma of Molecular Biology” - a term coined by Francis Crick.  Central dogma is a firm principle in biology that defines the flow of genetic information within any life form. The two fundamental steps in central dogma are - transcription and translation.
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In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
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In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
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Related Experiment Video

Updated: Sep 16, 2025

Characterizing RNA Modifications in Single Neurons Using Mass Spectrometry
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m6A in the coding sequence: linking deposition, translation, and decay.

Miona Ćorović1, Peter Hoch-Kraft1, You Zhou2

  • 1Institute of Molecular Biology (IMB), 55128 Mainz, Germany.

Trends in Genetics : TIG
|July 8, 2025
PubMed
Summary

N6-methyladenosine (m6A) modifications in mRNA coding sequences regulate mRNA turnover. The newly discovered CDS-m6A decay pathway promotes rapid degradation, offering potential therapeutic targets for diseases.

Keywords:
CDS–m6A decayP-bodiesexon-junction complexm(6)A RNA modificationstranslation

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A Method for Measuring RNA N6-methyladenosine Modifications in Cells and Tissues
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A Method for Measuring RNA N6-methyladenosine Modifications in Cells and Tissues
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A Method for Measuring RNA N6-methyladenosine Modifications in Cells and Tissues

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Area of Science:

  • Molecular Biology
  • Epigenetics
  • RNA Biology

Background:

  • N6-methyladenosine (m6A) is the most prevalent internal mRNA modification.
  • m6A plays a critical role in regulating mRNA stability and turnover.

Purpose of the Study:

  • To explore m6A sites within the coding sequence (CDS) and their impact on mRNA decay.
  • To focus on the newly identified CDS-m6A decay (CMD) pathway.
  • To investigate the influence of splicing factors on m6A deposition and CMD target enrichment in P-bodies.

Main Methods:

  • Review of existing literature on m6A modification, mRNA decay pathways, and splicing.
  • Analysis of the characteristics of m6A sites in CDS.
  • Examination of the translation-dependent nature of the CMD pathway.

Main Results:

  • m6A sites in the CDS influence mRNA decay.
  • The CMD pathway is a translation-dependent mechanism for rapid mRNA degradation.
  • Splicing-associated factors affect m6A deposition.
  • CMD targets are enriched in processing bodies (P-bodies).

Conclusions:

  • There is a significant interplay between m6A modification and mRNA decay.
  • Targeting the CMD pathway presents novel therapeutic opportunities.
  • Potential applications include treating cancers and metabolic disorders.