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Distal nucleotides affect the rate of stop codon read-through.

Luciana I Escobar1, Andres M Alonso2, Jorge R Ronderos3

  • 1CREG Universidad Nacional de La Plata-CONICET La Plata CP 1900 Argentina.

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Summary

Stop codon read-through (SCR) allows translation to continue into 3' untranslated regions. Nucleotide patterns near stop codons influence SCR, suggesting distinct mechanisms for different codons.

Keywords:
nucleotide usage frequencyribosomal density profilesstop codonstranslational readthroughtranslational termination

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Area of Science:

  • Molecular Biology
  • Genetics
  • Transcriptomics

Background:

  • Translation termination relies on accurate stop codon recognition.
  • Ribosomes can misinterpret stop codons, leading to translation in the 3 UTR, a phenomenon known as stop codon read-through (SCR).
  • The precise mechanisms governing programmed SCR remain largely unknown.

Purpose of the Study:

  • To comprehensively identify SCR events in the *Drosophila melanogaster* transcriptome.
  • To characterize the nucleotide sequences associated with SCR events.
  • To investigate the mechanisms influencing translational termination.

Main Methods:

  • Analysis of ribosomal density profiles to identify SCR events.
  • Estimation of ribosomal leak rates for identified SCR events.
  • Statistical analysis of nucleotide frequencies in regions proximal to stop codons.

Main Results:

  • Distinct nucleotide usage patterns were observed for transcripts with UGA versus UAA stop codons, indicating potentially different SCR mechanisms.
  • Linear regression models showed that nucleotides at specific informative positions better predict SCR than the entire sequence context.
  • Distal nucleotides were found to influence SCR rates in a stop-codon-specific manner.

Conclusions:

  • Evidence suggests at least two distinct mechanisms can modulate translational termination.
  • Nucleotide sequence context, particularly at distal positions, plays a role in regulating SCR rates.
  • Understanding SCR mechanisms is crucial for accurate gene expression studies.