Codon usage in Caenorhabditis elegans: delineation of translational selection and mutational biases.
AUTOR(ES)
Stenico, M
RESUMO
Synonymous codon usage varies considerably among Caenorhabditis elegans genes. Multivariate statistical analyses reveal a single major trend among genes. At one end of the trend lie genes with relatively unbiased codon usage. These genes appear to be lowly expressed, and their patterns of codon usage are consistent with mutational biases influenced by the neighbouring nucleotide. At the other extreme lie genes with extremely biased codon usage. These genes appear to be highly expressed, and their codon usage seems to have been shaped by selection favouring a limited number of translationally optimal codons. Thus, the frequency of these optimal codons in a gene appears to be correlated with the level of gene expression, and may be a useful indicator in the case of genes (or open reading frames) whose expression levels (or even function) are unknown. A second, relatively minor trend among genes is correlated with the frequency of G at synonymously variable sites. It is not yet clear whether this trend reflects variation in base composition (or mutational biases) among regions of the C.elegans genome, or some other factor. Sequence divergence between C.elegans and C.briggsae has also been studied.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=308193Documentos Relacionados
- Synonymous codon usage in Bacillus subtilis reflects both translational selection and mutational biases.
- Proteome composition and codon usage in spirochaetes: species-specific and DNA strand-specific mutational biases.
- Synonymous Codon Usage in Drosophila Melanogaster: Natural Selection and Translational Accuracy
- Codon usage in Chlamydia trachomatis is the result of strand-specific mutational biases and a complex pattern of selective forces
- Solving the riddle of codon usage preferences: a test for translational selection