Codon Usage Bias and Determining Forces in Taenia solium Genome

Area of Science:

• Genomics
• Parasitology
• Molecular Biology

Background:

• Taenia solium is a significant zoonotic parasite affecting human health and causing economic losses.
• Current control methods like vaccines and chemotherapy have limitations, necessitating further research into parasite biology.

Purpose of the Study:

• To investigate codon usage patterns in the Taenia solium genome.
• To identify the forces shaping codon usage bias in this important parasite.

Main Methods:

• Analysis of codon usage patterns across 8,484 protein-coding genes.
• Utilized neutrality analysis, ENC vs GC3s plots, and Parity Rule 2 (PR2) plots.
• Identified optimal codons within the T. solium genome.

Main Results:

• A narrow GC distribution and a correlation between GC12 and GC3 were observed.
• Mutational bias significantly influences codon usage, as indicated by low effective number of codons (ENC) values.
• GC and AT content were not proportionally used, and 26 optimal codons, ending in G or C, were identified.

Conclusions:

• Mutational bias is a major factor shaping codon usage in Taenia solium.
• Translational selection, indicated by optimal codons likely corresponding to highly expressed tRNAs, also plays a role.
• Understanding these codon usage dynamics can inform future strategies against Taenia solium infections.