Analysis of synonymous codon usage patterns in duck hepatitis A virus: a comparison on the roles of mutual pressure and natural selection

被引:18
作者
Chen Y. [1 ]
Chen Y.-F. [2 ]
机构
[1] Department of Renewable Resources, University of Alberta, Edmonton, T6G 2H1, AB
[2] College of Software, Harbin Normal University, Harbin, Heilongjiang
关键词
Compositional constraint; Multivariate statistics; Mutational pressure; Natural selection; Optimal codons; Synonymous substitution;
D O I
10.1007/s13337-014-0191-2
中图分类号
学科分类号
摘要
Codon usage patterns of duck hepatitis A virus (HAV) were studied in the present study. The major trends of codon usage patterns were analyzed using principal component analysis on the basis of the relative synonymous codon usage values. Correlation analysis was utilized to reveal the associations of the first two major axes of PCA and nucleotide- or amino acid-relevant indices. Our results showed that compositional constraint and/or mutational pressure are major factors influencing codon usage bias patterns of HAV. However, the influence of natural selection is also prevalent, as indicated by strongly significant correlations between the hydrophobicity, aromaticity, aliphaticity and ionization and the first axis of PCA. Also, ionization could characterize the second axis of PCA. At last, maximum likelihood phylogenetic analysis shows that there are no remarkable geographic clustering patterns of HAV strains in the phylogenetic tree. However, through MANOVA test, there are significant differences on the codon usage patterns among HAV strains from different countries. In conclusion, both mutational pressure and natural selection are of equally great importance to codon usage patterns of duck HAV genomes. © 2014, Indian Virological Society.
引用
收藏
页码:285 / 293
页数:8
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