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Regulation of Expression at Multiple Steps01:23

Regulation of Expression at Multiple Steps

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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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Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
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In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing...
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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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Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
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In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
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Author Spotlight: Exploring the Frontier of mRNA Research with Poly A Tail Analysis Techniques
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A kinetic ruler controls mRNA poly(A) tail length.

Emilie Gabs1, Emil Aalto-Setälä1, Aada Välisaari1

  • 1Department of Life Technologies, University of Turku, Turku 20520, Finland.

Genes & Development
|August 22, 2025
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Summary

Nab2 protein dimerization controls mRNA poly(A) tail length in yeast by competing with synthesis. This kinetic ruler mechanism ensures uniform tail lengths, crucial for gene expression regulation.

Keywords:
CCCH zinc finger proteinNab2RNA-binding proteinZC3H14cleavage and polyadenylation complex (CPAC)kinetic rulermRNA polyadenylationpoly(A) binding protein (PABP)poly(A) tail

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Yeast Genetics

Background:

  • Poly(A) tails are essential for mRNA stability and translation.
  • The cleavage and polyadenylation complex (CPAC) and poly(A) binding proteins (PABPs) cooperate to synthesize uniform poly(A) tails.
  • Nab2 is the key PABP in Saccharomyces cerevisiae, regulating the biogenesis of mRNA poly(A) tails.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying poly(A) tail length control by Nab2.
  • To investigate the role of Nab2 dimerization in polyadenylation termination.
  • To understand how Nab2 binding kinetics influence mature poly(A) tail length.

Main Methods:

  • In vitro reconstitution of polyadenylation reactions.
  • Formation of Nab2:poly(A) RNA ribonucleoprotein particles.
  • Analysis of Nab2 dimerization and RNA binding kinetics.

Main Results:

  • Nab2 dimerization is essential for polyadenylation termination.
  • Nab2 dimers are stable on poly(A) tails longer than 25 adenosines, preventing premature termination.
  • Poly(A) tail length is determined by the kinetic competition between CPAC elongation and Nab2 binding.
  • Autoregulation of Nab2 concentration buffers variations in RNA binding rates.

Conclusions:

  • Poly(A) tail length control operates via a "kinetic ruler" mechanism.
  • Nab2 concentration quantifies RNA length, ensuring uniform poly(A) tail formation.
  • This mechanism ensures proper gene expression regulation in Saccharomyces cerevisiae.