Synonymous codon usage in Thermosynechococcus elongatus (cyanobacteria) identifies the factors shaping codon usage...

Area of Science:

• Genomics
• Molecular Biology
• Bioinformatics

Background:

• Codon usage bias influences gene expression and protein synthesis.
• Thermophilic cyanobacteria, like Thermosynechococcus elongatus BP-1, offer unique insights into genome evolution under extreme conditions.

Purpose of the Study:

• To analyze the synonymous codon usage patterns in Thermosynechococcus elongatus BP-1.
• To identify the key factors driving codon usage variation in this organism.

Main Methods:

• Multivariate statistical analysis, including correspondence analysis.
• Analysis of gene expression levels, gene length, and codon composition (GC3s, Nc, RSCU).

Main Results:

• A single major axis explained codon usage variation, strongly correlated with GC content at the third codon position (GC3s).
• A negative correlation between effective number of codons (Nc) and GC3s was observed.
• Highly expressed genes showed a higher proportion of pyrimidine-ending codons compared to lowly expressed genes.
• Translational selection, translational accuracy, and gene expression levels were identified as additional factors influencing codon usage.

Conclusions:

• Mutational bias is the predominant force shaping codon usage in T. elongatus.
• Translational selection, translational accuracy, and gene expression levels also contribute to codon usage variation.
• Understanding these factors is crucial for comprehending genome evolution and gene expression regulation in thermophilic cyanobacteria.