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Related Concept Videos

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.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
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mRNA Stability and Gene Expression02:51

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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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Nuclear Export of mRNA02:31

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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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RNA Stability01:53

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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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Related Experiment Video

Updated: Dec 15, 2025

Determining Genome-wide Transcript Decay Rates in Proliferating and Quiescent Human Fibroblasts
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UPF1-Mediated RNA Decay-Danse Macabre in a Cloud.

Daria Lavysh1,2,3, Gabriele Neu-Yilik1,2,3

  • 1Department of Pediatric Oncology, Hematology and Immunology, University of Heidelberg, Im Neuenheimer Feld 430, 69120 Heidelberg, Germany.

Biomolecules
|July 9, 2020
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Summary

Nonsense-mediated RNA decay (NMD) and related UPF1-mediated RNA decay pathways (UMDs) in mammals are complex and variable. Research suggests these pathways may be variations of a single phenomenon, akin to a flexible computing cloud.

Keywords:
RNA turnover and surveillanceRNA-binding proteinUPF1UPF1-mediated RNA decaynonsense-mediated RNA decay

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Area of Science:

  • Molecular Biology
  • Genetics
  • RNA Biology

Background:

  • Nonsense-mediated RNA decay (NMD) is a key RNA surveillance pathway.
  • NMD in higher eukaryotes is complex, with variations in substrates, efficiency, and effectors.
  • Distinguishing NMD from other UPF1-mediated RNA decay pathways (UMDs) is challenging.

Purpose of the Study:

  • To critically examine prevailing NMD models in mammalian systems.
  • To explore the minimal requirements for NMD and other UMDs.
  • To determine if NMD and UMDs are distinct pathways or variations of a single process.

Main Methods:

  • Critical analysis of existing NMD models.
  • Comparative examination of NMD and UMDs in mammalian systems.
  • Exploration of mechanistic details and effector proteins.

Main Results:

  • NMD in higher eukaryotes exhibits significant variability compared to yeast.
  • Defining NMD and differentiating it from other UMDs remains difficult.
  • Existing models show gaps and inconsistencies regarding NMD and UMDs.

Conclusions:

  • NMD and other UMDs may represent variations of a unified UPF1-mediated decay mechanism.
  • The UPF1-mediated decay family operates like a flexible 'computing cloud' system.
  • Further research is needed to fully elucidate the relationship between NMD and UMDs.