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Phenomenon of unequal use of synonymous codons in  Mycobacterium tuberculosis  is common. Codon usage bias not only plays an important regulatory role at the level of gene expression, but also helps in improving the accuracy and efficiency of translation. Meanwhile, codon usage pattern of  Mycobacterium tuberculosis  genome is important for interpreting evolutionary characteristics in species. In order to investigate the codon usage pattern of the  Mycobacterium tuberculosis  genome, 12  Mycobacterium tuberculosis  genomes from different  area  are downloaded from the GeneBank. The correlations between G 3 , GC 12 , whole GC content, codon adaptation index, codon bias index, and so on of  Mycobacterium tuberculosis  genomes are calculated. The ENC-plot, relationship between A 3 /(A 3  + T 3 ) and G 3 /(G 3  + C 3 ), GC 12  versus GC 3  plot, and the RSCU of overall/separated genomes all show that the codon usage bias exists in all 12  Mycobacterium tuberculosis  genomes. Lastly, relationship between CBI and the equalization of ENC shows a strong negative correlation between them. The relationship between protein length and GC content (GC 3  and GC 12 ) shows that more obvious differences in the GC content may be in shorter protein. These results show that codon usage bias existing in the  Mycobacterium tuberculosis  genomes could be used for further study on their evolutionary phenomenon.

Comprehensive Analysis and Comparison on the Codon Usage Pattern of Whole Mycobacterium tuberculosis Coding Genome from Different Area