Abstract
Background
Synonymous codon usage bias is noticed in the genome of every organism, influenced by mutation pressure and natural selection. The analysis of codon usage pattern in Porphyra umbilicalis chloroplast genome are inferred while previous study focused on codon bias in nuclear genome.
Objective
To develop a better understanding of the factors affecting synonymous codon usage, codon usage patterns and nucleotide composition of 150 genes in P. umbilicalis cp genome, and provide a theoretical basis for genetic modification of chloroplast genome.
Methods
In this study, all codon usage bias parameters and nucleotide compositions were calculated by Python script, Codon W, DNA Star, CUSP of EMBOSS and Microsoft Excel.
Results
It shows that codon usage models are mainly influenced by compositional constraints under mutational pressure and synonymous codon prefers to use codons ending with A/T, comparing to C/G. The ENC value is slight low which shows the weak codon bias. For all coding genes of P. umbilicalis chloroplast genome except Photosystem I genes, a weak correlation between GC3 and GC12 suggests natural selection might play a significant role in synonymous codon usage bias.
Conclusion
The codon usage bias in P. umbilicalis cp genome is low and in some way or other, influenced by natural selection, mutation pressure, nucleotide composition. Our results can provide a theoretical basis for codon modification of exogenous genes, accuracy of prediction about new members of chloroplast gene family and identification of unknown genome.
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Acknowledgements
This work was supported by the research grants from Discipline construction Double Support Project of Sichuan Agricultural University (Grant No. 00770114).
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GLL and HPY identified the research topic and designed the experiments. YYH, QYX and YJ collected the data. GLL and SCG performed the experiments and analyzed the data. GLL and ZLP wrote the manuscript. All authors read and approved the final manuscript.
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Li, G., Pan, Z., Gao, S. et al. Analysis of synonymous codon usage of chloroplast genome in Porphyra umbilicalis. Genes Genom 41, 1173–1181 (2019). https://doi.org/10.1007/s13258-019-00847-1
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DOI: https://doi.org/10.1007/s13258-019-00847-1