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Studies on codon usage in Entamoeba histolytica.
T C Ghosh1, S K Gupta, S Majumdar
1Distributed Information Centre, Bose Institute, P 1/12, C.I.T. Scheme, VII M, 700 054, Calcutta, India. tapash@boseinst.ernet.in
International Journal for Parasitology
|June 17, 2000
Summary
Entamoeba histolytica exhibits codon usage bias, with highly expressed genes favoring C-ending codons and lowly expressed genes showing A/T-ending codon preference, indicating both mutation and selection influence its genome.
Area of Science:
- Genomics
- Molecular Biology
- Parasitology
Background:
- Entamoeba histolytica, a protozoan parasite, possesses an AT-rich genome.
- Codon usage bias is a significant factor influencing gene expression and evolution in various organisms.
Purpose of the Study:
- To investigate the codon usage bias in Entamoeba histolytica.
- To identify the factors driving codon usage variation within its genome.
Main Methods:
- Analysis of available Entamoeba histolytica DNA sequence data.
- Multivariate statistical analysis to identify trends in codon usage variation.
- Comparison of codon usage patterns between highly and lowly expressed genes.
Main Results:
- A strong bias towards A and/or T ending codons was observed in the overall coding region.
- Multivariate analysis revealed a primary trend in codon usage variation, separating highly and lowly expressed genes.
- Highly expressed genes showed a significant preference for C-ending codons, suggesting translational optimality.
- Lowly expressed genes were dominated by A and/or T ending codons, indicating the influence of compositional constraints.
Conclusions:
- Both mutational bias and translational selection are actively shaping codon usage variation in Entamoeba histolytica.
- The distinct codon usage patterns in highly and lowly expressed genes highlight the interplay of different evolutionary forces.