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. 2012 Oct 11;27(5):303–315. doi: 10.1007/s12250-012-3270-9

Characterization of synonymous codon usage bias in the pseudorabies virus US1 gene

Meili Li 1, Zhiyao Zhao 1, Jianhong Chen 2, Bingyun Wang 2, Zi Li 1, Jian Li 1, Mingsheng Cai 2,✉
PMCID: PMC8218062  PMID: 23055006

Abstract

In the present study, we examined the codon usage bias between pseudorabies virus (PRV) US1 gene and the US1-like genes of 20 reference alphaherpesviruses. Comparative analysis showed noticeable disparities of the synonymous codon usage bias in the 21 alphaherpesviruses, indicated by codon adaptation index, effective number of codons (ENc) and GC3s value. The codon usage pattern of PRV US1 gene was phylogenetically conserved and similar to that of the US1-like genes of the genus Varicellovirus of alphaherpesvirus, with a strong bias towards the codons with C and G at the third codon position. Cluster analysis of codon usage pattern of PRV US1 gene with its reference alphaherpesviruses demonstrated that the codon usage bias of US1-like genes of 21 alphaherpesviruses had a very close relation with their gene functions. ENc-plot revealed that the genetic heterogeneity in PRV US1 gene and the 20 reference alphaherpesviruses was constrained by G+C content, as well as the gene length. In addition, comparison of codon preferences in the US1 gene of PRV with those of E. coli, yeast and human revealed that there were 50 codons showing distinct usage differences between PRV and yeast, 49 between PRV and human, but 48 between PRV and E. coli. Although there were slightly fewer differences in codon usages between E.coli and PRV, the difference is unlikely to be statistically significant, and experimental studies are necessary to establish the most suitable expression system for PRV US1. In conclusion, these results may improve our understanding of the evolution, pathogenesis and functional studies of PRV, as well as contributing to the area of herpesvirus research or even studies with other viruses.

Keywords: Pseudorabies virus, US1 gene, Alphaherpesvirus, Codon usage bias

Footnotes

Foundation items: This work was supported by grants from the Scientific Research Foundation for the Ph.D., Guangzhou Medical University (2011C20); National Natural Science Foundation of China (31200120); Medical Scientific Research Foundation of Guangdong Province, China (B2012165), and the Guangzhou city-level key disciplines and specialties of Immunology (B127007).

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