Convergent host-parasite codon usage between honeybee and bee associated viral genomes

Area of Science:

• Virology
• Genomics
• Evolutionary Biology

Background:

• Codon usage bias is a key factor in gene expression and viral adaptation.
• Understanding host-virus interactions at the genomic level is crucial for predicting viral evolution.

Purpose of the Study:

• To investigate the codon usage patterns of honeybee-specific viruses.
• To determine if viral codon usage correlates with that of their insect hosts.
• To explore the evolutionary mechanisms driving viral adaptation to specific hosts.

Main Methods:

• Comparative analysis of codon usage in four insect species (honeybee, red flour beetle, mosquito, fruit fly).
• Correlation analysis between insect codon usage and six honeybee host-specific viruses.
• Phylogenetic analysis to assess codon usage similarity in relation to evolutionary relatedness.

Main Results:

• Honeybee viruses exhibited strong codon usage similarity with honeybees, but weak similarity with other insects like the red flour beetle.
• Insects showed codon usage similarity generally reflecting their known phylogenetic relationships.
• A notable exception was the high codon usage similarity between honeybee viruses and honeybees, suggesting convergent evolution.

Conclusions:

• Honeybee viruses rapidly optimize codon usage to match their host, demonstrating convergent evolution.
• Small, host-specific viral genomes can quickly adapt to enhance parasitic success.
• This study provides the first evidence of codon usage co-evolution between an insect host and single-stranded RNA viruses.