Journal
JOURNAL OF MOLECULAR EVOLUTION
Volume 61, Issue 3, Pages 315-324Publisher
SPRINGER
DOI: 10.1007/s00239-004-0287-1
Keywords
Drosophila; codon bias; recombination
Funding
- NATIONAL HUMAN GENOME RESEARCH INSTITUTE [T32HG000044] Funding Source: NIH RePORTER
- NHGRI NIH HHS [5 T32 HG00044] Funding Source: Medline
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The patterns and processes of molecular evolution may differ between the X chromosome and the autosomes in Drosophila melanogaster. This may in part be due to differences in the effective population size between the two chromosome sets and in part to the hemizygosity of the X chromosome in Drosophila males. These and other factors may lead to differences both in the gene complements of the X and the autosomes and in the properties of the genes residing on those chromosomes. Here we show that codon bias and recombination rate are correlated strongly and negatively on the X chromosome, and that this correlation cannot be explained by indirect relationships with other known determinants of codon bias. This is in dramatic contrast to the weak positive correlation found on the autosomes. We explored possible explanations for these patterns, which required a comprehensive analysis of the relationships among multiple genetic properties such as protein length and expression level. This analysis highlights conserved features of coding sequence evolution on the X and the autosomes and illuminates interesting differences between these two chromosome sets.
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