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Nuclear Export of mRNA02:31

Nuclear Export of mRNA

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Cis-acting Elements involved in mRNA stability
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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Polysome Fractionation and Analysis of Mammalian Translatomes on a Genome-wide Scale
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Promoter elements regulate cytoplasmic mRNA decay.

Almog Bregman1, Moran Avraham-Kelbert, Oren Barkai

  • 1Department of Molecular Microbiology, Technion-Israel Institute of Technology, Haifa 31096, Israel.

Cell
|December 27, 2011
PubMed
Summary
This summary is machine-generated.

Yeast promoters, specifically the upstream activating sequence (UAS) and Rap1p protein, can control messenger RNA (mRNA) decay rates after transcription. This finding reveals a novel role for promoters in regulating gene expression post-transcriptionally.

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Area of Science:

  • Molecular Biology
  • Yeast Genetics
  • Gene Regulation

Background:

  • Promoters are DNA sequences crucial for initiating transcription and are regulated by trans-acting factors.
  • The conventional understanding of promoters is limited to their role in gene synthesis, not post-transcriptional regulation.

Purpose of the Study:

  • To investigate whether yeast promoters influence mRNA decay rates after transcription.
  • To identify specific promoter elements and factors involved in regulating mRNA stability.

Main Methods:

  • Utilized a reporter gene system in yeast to assess mRNA decay kinetics.
  • Manipulated upstream activating sequences (UAS) of the reporter gene.
  • Investigated the role of Rap1p-binding sites and the Rap1p protein in mRNA decay.

Main Results:

  • Altering UAS sequences of a reporter gene, without changing the transcript, modified its decay rate.
  • A specific cis element with two Rap1p-binding sites, along with Rap1p, was sufficient to enhance mRNA decay.
  • Rap1p was found to stimulate both synthesis and decay of certain endogenous mRNAs.

Conclusions:

  • Yeast promoters, through elements like UAS and proteins such as Rap1p, can regulate mRNA decay in the cytoplasm.
  • Promoter-bound factors may influence messenger ribonucleoprotein (mRNP) composition, affecting mRNA stability.
  • Promoters play a dual role in coordinating mRNA synthesis and decay, impacting overall mRNA levels.