Analysis of codon usage pattern in the radioresistant bacterium Deinococcus radiodurans

被引:41
|
作者
Liu, Qingpo [1 ]
机构
[1] Zhejiang Univ, Dept Agron, Coll Agr & Biotechnol, Hangzhou 310029, Peoples R China
关键词
Deinococcus radiodurans; codon usage; correspondence analysis;
D O I
10.1016/j.biosystems.2005.12.003
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
The main factors shaping codon usage bias in the Deinococcus radiodurans genome were reported. Correspondence analysis (COA) was carried out to analyze synonymous codon usage bias. The results showed that the main trend was strongly correlated with gene expression level assessed by the "Codon Adaptation Index" (CAI) values, a result that was confirmed by the distribution of genes along the first axis. The results of correlation analysis, variance analysis and neutrality plot indicated that gene nucleotide composition was clearly contributed to codon bias. CDS length was also key factor in dictating codon usage variation. A general tendency of more biased codon usage of genes with longer CDS length to higher expression level was found. Further, the hydrophobicity of each protein also played a role in shaping codon usage in this organism, which could be confirmed by the significant correlation between the positions of genes placed on the first axis and the hydrophobicity values (r=-0.100, P < 0.01). In summary, gene expression level played a crucial role, nucleotide mutational bias, CDS length and the hydrophobicity of each protein just in a minor way in shaping the codon usage pattern of D. radiodurans. Notably, 19 codons firstly defined as "optimal codons" may provide useful clues for molecular genetic engineering and evolutionary studying. (c) 2005 Elsevier Ireland Ltd. All rights reserved.
引用
收藏
页码:99 / 106
页数:8
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