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mRNA Stability and Gene Expression02:51

mRNA Stability and Gene Expression

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.
Cis-acting Elements involved in mRNA stability
mRNA Stability and Gene Expression02:51

mRNA Stability and Gene Expression

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.
Cis-acting Elements involved in mRNA stability
Nuclear Export of mRNA02:31

Nuclear Export of mRNA

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...
Nonsense-mediated mRNA Decay02:27

Nonsense-mediated mRNA Decay

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,...
Nonsense-mediated mRNA Decay02:27

Nonsense-mediated mRNA Decay

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,...
RNA Stability01:53

RNA Stability

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: May 21, 2026

Using the E1A Minigene Tool to Study mRNA Splicing Changes
10:25

Using the E1A Minigene Tool to Study mRNA Splicing Changes

Published on: April 22, 2021

Dis3- and exosome subunit-responsive 3' mRNA instability elements.

Daniel L Kiss1, Dezhi Hou, Robert H Gross

  • 1Case Western Reserve University School of Medicine, Department of Molecular Biology and Microbiology, Cleveland, OH 44106, United States.

Biochemical and Biophysical Research Communications
|June 7, 2012
PubMed
Summary
This summary is machine-generated.

Researchers identified novel RNA elements that directly recruit the exosome complex, including Dis3, to control messenger RNA (mRNA) turnover. This suggests a new mechanism for regulating gene expression via direct RNA-exosome interactions.

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Area of Science:

  • Molecular Biology
  • RNA Biology
  • Gene Regulation

Background:

  • Eukaryotic RNA turnover is crucial for gene expression and is partly regulated by the exosome complex.
  • The exosome, comprising RNases and RNA-binding proteins, degrades RNA molecules.
  • Dis3 is the primary RNase in the exosome, but its recruitment to RNA substrates is thought to be indirect.

Purpose of the Study:

  • To identify cis-acting elements responsible for recruiting Dis3 and other exosome subunits to RNA.
  • To investigate the role of these elements in regulating messenger RNA (mRNA) turnover.

Main Methods:

  • Bioinformatic screening using RNA SCOPE to identify candidate instability elements in 3' UTRs.
  • Luciferase reporter assays to validate the destabilizing function of identified elements.
  • RNA interference (RNAi) to deplete exosome subunits and assess their impact on destabilization.
  • Mutagenesis studies to confirm the role of specific elements (ESSEs).

Main Results:

  • Identified a cassette with four motifs that destabilized reporter transcripts.
  • Depletion of exosome subunits (Dis3, Rrp6, Rrp4, Rrp40, Rrp46) reduced the destabilizing effect.
  • Two specific elements, termed exosome subunit-sensitive elements (ESSEs), were found to be critical for destabilization.
  • Mutating ESSEs abolished the destabilization effect.
  • Analysis revealed that mRNAs containing ESSEs are consistently upregulated upon exosome subunit depletion.

Conclusions:

  • Discovered a novel class of cis-acting elements (ESSEs) that directly recruit exosome subunits, including Dis3.
  • These findings suggest a new mechanism for mRNA turnover involving direct exosome recruitment to mRNA substrates.
  • This provides a deeper understanding of RNA processing and gene expression regulation.