Analysis of synonymous codon usage bias in 09H1N1

Area of Science:

• Virology
• Molecular Biology
• Evolutionary Biology

Background:

• The 2009 pandemic influenza A virus subtype H1N1 (09H1N1) emerged as a novel reassortant strain.
• Evolutionary analyses indicate 09H1N1 is a triple reassortant, incorporating genetic segments from swine, avian, and human influenza viruses.

Purpose of the Study:

• To investigate the factors shaping codon usage bias in the 09H1N1 influenza virus.
• To perform cluster analysis of 60 influenza A virus strains based on codon usage bias.

Main Methods:

• Analysis of codon usage bias in 09H1N1.
• Comparative cluster analysis of 60 influenza A virus strains from various subtypes.

Main Results:

• 09H1N1 preferentially uses codons ending in adenine (A) or uracil (U).
• The intra-genomic codon usage bias of 09H1N1 is notably low.
• Base composition constraint, dinucleotide biases, and translational selection significantly influence 09H1N1 codon usage.
• Codon usage bias in 09H1N1 is similar to other H1N1, H9N2, H1N2, and H3N2 strains.

Conclusions:

• The study elucidates the evolutionary and regulatory mechanisms governing gene expression in 09H1N1.
• Findings provide insights into the evolution of the 09H1N1 influenza virus.