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Point mutations are genetic alterations involving the change of a single nucleotide base pair in DNA. Depending on how the alteration affects protein synthesis, they can lead to various consequences.Point mutations fall into the following types:Silent mutations occur when a nucleotide change does not alter the amino acid sequence due to the redundancy of the genetic code. For instance, changing ACC to ACA still encodes threonine, leaving the protein function unaffected. This occurs because...
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Related Experiment Video

Updated: Jan 21, 2026

Standardized Rat Coronary Ring Preparation and Real-Time Recording of Dynamic Tension Changes Along Vessel Diameter
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Complex dynamics under tension in a high-efficiency frameshift stimulatory structure.

Matthew T J Halma1, Dustin B Ritchie1, Tonia R Cappellano1

  • 1Department of Physics, University of Alberta, Edmonton, AB, Canada T6G2E1.

Proceedings of the National Academy of Sciences of the United States of America
|August 15, 2019
PubMed
Summary
This summary is machine-generated.

Programmed ribosomal frameshifting (PRF) efficiency is linked to mRNA structure. The West Nile virus frameshift signal exhibits extensive conformational heterogeneity, with transitions between structures under tension driving high -1 PRF efficiency.

Keywords:
RNA foldingWest Nile virusforce spectroscopyprogrammed ribosomal frameshiftingpseudoknots

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Virology

Background:

  • Specific mRNA structures stimulate programmed ribosomal frameshifting (PRF), a process crucial for gene expression regulation.
  • The structural features dictating the efficiency of PRF stimulation by these mRNA elements are not fully understood.
  • The West Nile virus (WNV) frameshift signal is known to induce high levels of -1 PRF, but its structural dynamics are complex and debated.

Purpose of the Study:

  • To investigate the structural dynamics of the WNV frameshift signal and identify features responsible for its high PRF stimulation efficiency.
  • To explore the relationship between mRNA structural transitions under mechanical tension and PRF efficiency.

Main Methods:

  • Utilized optical tweezers to apply controlled tension to single mRNA molecules of the WNV frameshift signal.
  • Measured force-extension curves to map mRNA folding pathways and identify intermediate structures.
  • Employed antisense oligomers to probe the role of specific RNA contacts in structural transitions.

Main Results:

  • The WNV frameshift signal forms a large number of metastable structures, including previously proposed pseudoknots and double hairpin conformations.
  • Two distinct, mutually exclusive folding pathways with multiple intermediates were identified.
  • The frequency of conformational transitions was maximal under forces mimicking ribosomal tension during -1 PRF.
  • The low occupancy of static pseudoknotted structures could not explain the high PRF efficiency.

Conclusions:

  • Conformational heterogeneity of the mRNA frameshift signal is a critical factor in stimulating high levels of PRF.
  • Dynamic transitions between different RNA conformers, particularly under mechanical tension applied by the ribosome, are directly linked to efficient -1 PRF.
  • This study provides a mechanistic link between mRNA structural dynamics and the efficiency of programmed ribosomal frameshifting.