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Phage Phenomics: Physiological Approaches to Characterize Novel Viral Proteins
Published on: June 11, 2015
Synonymous codon usage analysis of thirty two mycobacteriophage genomes
Sameer Hassan1, Vasantha Mahalingam, Vanaja Kumar
1Tuberculosis Research Centre Indian Council of Medical Research, Chennai 600 031, India.
Advances in Bioinformatics
|February 13, 2010
Summary
Synonymous codon usage in mycobacteriophages is influenced by nucleotide composition and translational selection. Mycobacteriophage Cooper shows high translational efficiency due to biased codon usage.
Area of Science:
- Microbiology
- Genomics
- Molecular Biology
Background:
- Synonymous codon usage (SCU) patterns provide insights into evolutionary pressures on gene sequences.
- Mycobacteriophages, viruses that infect Mycobacterium species, offer a unique system to study viral genome evolution.
Purpose of the Study:
- To analyze the synonymous codon usage patterns in 32 completely sequenced mycobacteriophage genomes.
- To identify the key factors shaping codon usage bias in these viral genomes.
Main Methods:
- Multivariate statistical analysis was applied to analyze SCU.
- Correlation analysis was used to assess relationships between codon usage, nucleotide composition (GC3s), and gene length.
- Comparison with host tRNA genes was performed.
Main Results:
- Compositional bias, particularly preference for C-ending codons in highly expressed genes, was a major factor influencing SCU.
- A negative correlation between the effective number of codons (Nc) and GC3s content indicated nucleotide composition effects.
- Translational selection, acting at the level of translational accuracy, also plays a role.
- Significant heterogeneity in codon usage was observed among and within mycobacteriophage genomes.
- Gene length influenced codon usage in a subset of the analyzed genomes.
- Mycobacteriophage Cooper exhibited the highest codon usage bias and superior translation efficiency compared to host tRNA genes.
Conclusions:
- Nucleotide composition and translational selection are significant drivers of synonymous codon usage in mycobacteriophages.
- Mycobacteriophage Cooper demonstrates optimized translational efficiency, suggesting strong selective pressures.
- The study highlights the diversity of codon usage strategies among mycobacteriophages.
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