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mRNA Stability and Gene Expression02:51

mRNA Stability and Gene Expression

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

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Regulation of Expression at Multiple Steps01:23

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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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Nuclear Export of mRNA02:31

Nuclear Export of mRNA

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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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Nuclear Export of mRNA02:31

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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.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
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Related Experiment Video

Updated: Apr 25, 2026

Saccharomyces cerevisiae Metabolic Labeling with 4-thiouracil and the Quantification of Newly Synthesized mRNA As a Proxy for RNA Polymerase II Activity
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Saccharomyces cerevisiae Metabolic Labeling with 4-thiouracil and the Quantification of Newly Synthesized mRNA As a Proxy for RNA Polymerase II Activity

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Coupling mRNA synthesis and decay.

Katherine A Braun1, Elton T Young2

  • 1Department of Biochemistry, University of Washington, Seattle, Washington, USA.

Molecular and Cellular Biology
|August 27, 2014
PubMed
Summary
This summary is machine-generated.

This study explores transcription-coupled mRNA decay, a process linking nuclear mRNA synthesis and cytoplasmic decay. It investigates the potential role of Snf1, a key protein kinase, in this newly discovered regulatory mechanism.

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Area of Science:

  • Molecular Biology
  • Gene Regulation
  • Biochemistry

Background:

  • Posttranscriptional regulation of gene expression influences organismal phenotype.
  • mRNA metabolism steps like capping, splicing, and polyadenylation are linked to transcription.
  • Recent findings suggest a link between RNA polymerase II and mRNA decay in the cytoplasm.

Purpose of the Study:

  • To review evidence for transcription-coupled mRNA decay.
  • To explore the potential involvement of Snf1 in this process.
  • To resolve the apparent paradox of linking nuclear mRNA synthesis with cytoplasmic decay.

Main Methods:

  • Literature review of recent evidence.
  • Analysis of mRNA metabolism and decay pathways.
  • Examination of the role of Snf1 (Saccharomyces cerevisiae AMP-activated protein kinase ortholog).

Main Results:

  • Evidence suggests a mechanistic link between mRNA synthesis and decay.
  • The process appears to involve RNA polymerase II and cytoplasmic mRNA decay pathways.
  • Snf1 may play a role in coordinating these linked processes.

Conclusions:

  • Transcription and mRNA decay are mechanistically linked, challenging previous understanding.
  • This link represents a novel layer of gene expression regulation.
  • Further research is needed to fully elucidate the role of Snf1 in transcription-coupled mRNA decay.