Abstract
Codon bias study in an organism gains significance in understanding the molecular mechanism as well as the functional conservation of gene expression during the course of evolution. The prime focus in this study is to compare the codon usage patterns among the four species belonging to the genus Bungarus (B. multicinctus, B. fasciatus, B. candidus and B. flaviceps) using several codon bias parameters. Our results suggested that relatively low codon bias exists in the coding sequences of the selected species. The compositional constraints together with gene expression level might influence the patterns of codon usage among the genes of Bungarus species. Both natural selection and mutation pressure affect the codon usage pattern in Bungarus species as evident from correspondence analysis. Neutrality plot indicates that natural selection played a major role while mutation pressure played a minor role in codon usage pattern of the genes in Bungarus species.
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