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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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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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m6A sites in the coding region trigger translation-dependent mRNA decay.

You Zhou1, Miona Ćorović2, Peter Hoch-Kraft2

  • 1Buchmann Institute for Molecular Life Sciences (BMLS) & Institute of Molecular Biosciences, Goethe University Frankfurt, 60438 Frankfurt a.M., Germany; Theodor Boveri Institute, Biocenter, University of Würzburg, Am Hubland, 97074 Würzburg, Germany.

Molecular Cell
|November 22, 2024
PubMed
Summary

N6-Methyladenosine (m6A) in messenger RNA coding sequences triggers a new decay pathway called CDS-m6A decay (CMD). This process, dependent on translation, rapidly degrades transcripts, impacting gene expression.

Keywords:
P-bodiesRNA decayRNA modificationYTHDF2coding sequencem6Aribosomal A siteribosome pausingtranslation

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Area of Science:

  • Molecular Biology
  • RNA Biology
  • Gene Regulation

Background:

  • N6-Methyladenosine (m6A) is a key RNA modification influencing mRNA stability.
  • m6A's role in mRNA degradation has been primarily linked to the 3' untranslated region.
  • The precise mechanisms and efficiency of m6A-mediated decay are still under investigation.

Purpose of the Study:

  • To investigate novel m6A-dependent RNA decay pathways.
  • To characterize the role of m6A modifications within the coding sequence (CDS) of mRNAs.
  • To elucidate the mechanism and functional significance of CDS-m6A decay (CMD).

Main Methods:

  • Utilized human cell lines to study RNA modifications.
  • Employed techniques to analyze m6A site distribution and impact on mRNA stability.
  • Investigated the role of translation, ribosome pausing, and protein factors like YTHDF2 in the decay process.
  • Tracked transcript localization to processing bodies (P-bodies).

Main Results:

  • Discovered a new pathway, CDS-m6A decay (CMD), initiated by m6A sites in the mRNA coding sequence.
  • Demonstrated that CDS m6A sites induce faster and more efficient transcript degradation than 3' UTR sites.
  • Showed CMD is a translation-dependent process involving ribosome pausing and transcript destabilization.
  • Identified YTHDF2 recruitment and translocation to P-bodies as key steps in CMD.

Conclusions:

  • CMD is a previously unrecognized pathway for mRNA decay.
  • m6A modifications in the CDS play a significant role in regulating gene expression.
  • CMD is particularly important for controlling the expression of developmental regulators and retrogenes.