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De novo Identification of Actively Translated Open Reading Frames with Ribosome Profiling Data
Published on: February 18, 2022
Relationships among stop codon usage bias, its context, isochores, and gene expression level in various eukaryotes
Jingchun Sun1, Ming Chen, Jinlin Xu
1School of Life Sciences & Technology, Shanghai Jiaotong University, Shanghai 200240, China.
Journal of Molecular Evolution
|September 20, 2005
Summary
Stop codon usage shows significant bias across eukaryotes, with specific patterns for UAA and UGA. These biases are linked to genomic complexity, not gene expression or GC3 content.
Area of Science:
- Molecular Biology
- Genomics
- Bioinformatics
Background:
- Stop codons (UAA, UGA, UAG) terminate protein synthesis.
- Synonymous codon usage bias is well-documented, but stop codon bias is less explored.
Purpose of the Study:
- Investigate stop codon usage bias in diverse eukaryotes.
- Analyze relationships between stop codon bias and genomic features like GC3 content, gene expression, and secondary structure.
Main Methods:
- Systematic analysis of stop codon usage across eukaryotic species.
- Information content and logo analysis for conserved patterns.
- Secondary structure prediction.
Main Results:
- Strong stop codon usage bias observed: UAA overrepresented in lower eukaryotes, UGA in higher eukaryotes, UAG least used.
- Conserved patterns identified for each stop codon type.
- GC3 content increases with organismal complexity.
- UAA associated with loop structures; UGA found in both loop and stem structures.
- No significant correlation between stop codon bias and GC3 content or gene expression level in individual eukaryotes.
Conclusions:
- Stop codons exhibit usage biases similar to synonymous codons.
- Genomic complexity and GC3 content may influence stop codon bias.
- Further research is needed to elucidate the causes and functional implications of stop codon bias.
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