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T-G-A Deficiency Pattern in Protein-Coding Genes and Its Potential Reason.

Yan-Ting Jin1,2, Dong-Kai Pu1, Hai-Xia Guo1

  • 1School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu, China.

Frontiers in Microbiology
|May 23, 2022
PubMed
Summary

Functional genes avoid stop codons to prevent harmful premature protein termination. This study found lower nucleotide frequencies for stop codons across 19,911 prokaryote genomes, supporting this avoidance hypothesis.

Keywords:
T-G-A deficiencycodon positionpremature proteinstop codonstermination

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Area of Science:

  • Molecular Biology
  • Genomics
  • Evolutionary Biology

Background:

  • Stop codons (e.g., TAA, TAG, TGA) signal the termination of protein translation.
  • Premature termination due to intragenic stop codons can lead to non-functional or harmful proteins.
  • Organisms may evolve mechanisms to minimize the occurrence of intragenic stop codons.

Purpose of the Study:

  • To investigate the hypothesis that functional genes avoid intragenic stop codons.
  • To analyze nucleotide frequencies at codon positions across a large dataset of prokaryotic genomes.
  • To understand the evolutionary pressures shaping codon usage related to translation termination.

Main Methods:

  • Analysis of nucleotide frequencies at each codon position in 19,911 prokaryotic genomes.
  • Statistical examination of stop codon usage patterns (TAA, TAG, TGA).
  • Correlation analysis between TGA deficiency and gene length in *Escherichia coli*.

Main Results:

  • Nucleotides corresponding to stop codons exhibit significantly lower frequencies in most prokaryotic genomes.
  • A consistent T-G-A deficiency pattern was observed across different stop codons.
  • A positive correlation was found between the extent of TGA deficiency and gene length in *E. coli*.

Conclusions:

  • The findings support the hypothesis that genes actively avoid intragenic stop codons.
  • The T-G-A deficiency pattern suggests a conserved mechanism to prevent premature translation termination.
  • This codon usage tactic provides insights into the evolution of gene regulation and genome organization.