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基孔肯雅病毒密码子使用情况及其影响因素的全基因组分析

Genome-wide analysis of codon usage and influencing factors in chikungunya viruses.

作者信息

Butt Azeem Mehmood, Nasrullah Izza, Tong Yigang

机构信息

Centre of Excellence in Molecular Biology (CEMB), University of the Punjab, Lahore, Pakistan.

Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan.

出版信息

PLoS One. 2014 Mar 4;9(3):e90905. doi: 10.1371/journal.pone.0090905. eCollection 2014.

DOI:10.1371/journal.pone.0090905
PMID:24595095
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC3942501/
Abstract

Chikungunya virus (CHIKV) is an arthropod-borne virus of the family Togaviridae that is transmitted to humans by Aedes spp. mosquitoes. Its genome comprises a 12 kb single-strand positive-sense RNA. In the present study, we report the patterns of synonymous codon usage in 141 CHIKV genomes by calculating several codon usage indices and applying multivariate statistical methods. Relative synonymous codon usage (RSCU) analysis showed that the preferred synonymous codons were G/C and A-ended. A comparative analysis of RSCU between CHIKV and its hosts showed that codon usage patterns of CHIKV are a mixture of coincidence and antagonism. Similarity index analysis showed that the overall codon usage patterns of CHIKV have been strongly influenced by Pan troglodytes and Aedes albopictus during evolution. The overall codon usage bias was low in CHIKV genomes, as inferred from the analysis of effective number of codons (ENC) and codon adaptation index (CAI). Our data suggested that although mutation pressure dominates codon usage in CHIKV, patterns of codon usage in CHIKV are also under the influence of natural selection from its hosts and geography. To the best of our knowledge, this is first report describing codon usage analysis in CHIKV genomes. The findings from this study are expected to increase our understanding of factors involved in viral evolution, and fitness towards hosts and the environment.

摘要

基孔肯雅病毒(CHIKV)是披膜病毒科的一种节肢动物传播病毒,通过伊蚊属蚊子传播给人类。其基因组由一个12 kb的单链正义RNA组成。在本研究中,我们通过计算几个密码子使用指数并应用多元统计方法,报告了141个基孔肯雅病毒基因组中的同义密码子使用模式。相对同义密码子使用(RSCU)分析表明,偏好的同义密码子以G/C结尾且A在第三位。基孔肯雅病毒与其宿主之间的RSCU比较分析表明,基孔肯雅病毒的密码子使用模式是巧合与拮抗的混合。相似性指数分析表明,在进化过程中,黑猩猩和白纹伊蚊对基孔肯雅病毒的整体密码子使用模式产生了强烈影响。从有效密码子数(ENC)和密码子适应指数(CAI)分析推断,基孔肯雅病毒基因组中的整体密码子使用偏好较低。我们的数据表明,虽然突变压力在基孔肯雅病毒的密码子使用中占主导地位,但基孔肯雅病毒的密码子使用模式也受到其宿主和地理环境自然选择的影响。据我们所知,这是第一篇描述基孔肯雅病毒基因组密码子使用分析的报告。本研究的结果有望增进我们对病毒进化、对宿主和环境适应性相关因素的理解。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/95ac/3942501/479917207eec/pone.0090905.g008.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/95ac/3942501/f1d01b74c0b2/pone.0090905.g001.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/95ac/3942501/479917207eec/pone.0090905.g008.jpg

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