Abstract
Amino acid and phylogenetic analysis showed that PB1-F2 of H7N7 and H3N8 equine influenza virus (EIV) evolved into two and nine clades, respectively. The PB1-F2 gene of H7N7 EIV strains isolated after 1973 was identified as being replaced by that of H3N8 EIV circulating simultaneously. All H7N7 EIV strains before 1973 contained PB1-F2 of 34 aa, while 90 aa after 1973. Meanwhile, most H3N8 EIV strains contained PB1-F2 of 90 or 81 aa. Evolutionary rate of PB1-F2 of H3N8 EIV was similar with that of PB1 in previous study. Meanwhile, PB1-F2 of H7N7 EIV evolved in significantly higher rate when compared with PB1-F2 of H3N8 EIV. Codon usage analysis revealed that PB1-F2 gene of EIV was less biased, which was identified as being determined by three main factors: mutational bias, selection pressure, and gene length. Our studies first in details report the genetic evolution, evolutionary rate, and the factors influencing codon usage bias of PB1-F2 of EIV.
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Gang Lu, Wei Guo, and Ting Qi contributed equally to this study.
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Lu, G., Guo, W., Qi, T. et al. Genetic analysis of the PB1-F2 gene of equine influenza virus. Virus Genes 47, 250–258 (2013). https://doi.org/10.1007/s11262-013-0935-x
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DOI: https://doi.org/10.1007/s11262-013-0935-x